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Villaros, Arnaud. "Petrogenesis of S-type granites : the example of the Cape Granite Suite." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4015.
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Thesis (PhD (Earth Sciences))--University of Stellenbosch, 2010.ENGLISH SUMMARY: S-type granite intrusions are extremely common in the continental crust and form from the partial melting of metasediments. Compositions of S-type granite range from leucogranite to granodiorite and have trace element contents that globally increase with increasing maficity (Fe + Mg). Models proposed for the formation of S-type granite do not answer satisfactorily all petrological and compositional requirements. In this study, S-type granite of the Cape Granite Suite (CGS), South Africa is used to discriminate between potential sources of compositional variation. Experimental studies show that melt produced from the partial melting of sediment is exclusively leucocratic. On this basis, the entrainment of up to 20 wt.% of peritectic garnet within S-type melt can be established to produce the observed major element variations. S-type CGS locally contains garnet. This garnet is in equilibrium with granite composition at P-T conditions (5kb and 750 C for the core of the garnet and 3kb and 720 C for the rim) well below conditions recorded by xenoliths from the same granite (10 kb and 850 C from a metabasite). From this result it seems that the originally entrained garnet no longer exists in the Stype CGS and it have been replaced by newly formed minerals (garnet, cordierite and biotite). Considering the short time necessary to emplace granites (about 100 000 years), it appears that garnet has been compositionnally re-equilibrated through a dissolution-precipitation process. The study of trace element variations in S-type CGS shows that most leucocratic compositions are undersaturated in Zr and Ce compared to predictions from experimental models for dissolution of accessory zircon and monazite in their source regions. Thus, S-type melts are likely to be formed in disequilibrium with respect to accessory phase stability. As a result the observed increase in trace element content with increasing maficity indicates that accessory minerals such as zircon and monazite are co-entrained with peritectic garnet in melt to produce the observed trace element variation in S-type granite. Trace element disequilibrium in the CGS S-type granitoids requires particularly short times of residence of melt within the source region. Together, these results provide for the first time, a fully comprehensive model for major and trace elements variations. Compositional variation in CGS S-type granite results from source processes by a selective entrainment of peritectic and accessory minerals. After entrainment, these minerals are likely to be re-equilibrated within the magma, through a dissolution-reprecipitation process. In addition, it appears that the construction of large S-type granitic bodies occurs through successive addition of magma batches of different composition that originates directly from the source region.
AFRIKAANSE OPSOMMING: S-tipe granietinstrusies is baie algemeen in die kontinentale kors en vorm deur die gedeeltelike smelting van metasedimente. Samestellings van S-tipe graniete strek vanaf leukograniet tot granodioriet en het spoorelementsamestellings wat global toeneem met ’n toenemende mafiese component (Fe + Mg). Modelle wat voorgestel is vir die formasie van S-tipe graniete beantwoord nie bevredigend al die petrologiese en komposisionele benodigdhede nie. In hierdie studie word S-tipe graniete van die Kaapse Graniet Suite (CGS), Suid Afrika, gebruik om te diskrimineer tussen potensiele bronne van komposisionele variasie. Eksperimentele studies wys dat smelt, geproduseer van die gedeeltelike smelting van sedimente, uitsluitlik leukokraties is. Op hierdie basis kan bewys word, dat die optel-en-meevoering van tot 20 wt% van peritektiese granaat in S-tipe smelt, die waargeneemde hoofelement variasies kan produseer. S-tipe CGS bevat lokale granaat. Hierdie granaat is in ekwilibrium met die graniet samestelling by P-T kondisies (5kb en 750circC vir die kern van die granaat en 3kb en 720circC vir die rand) ver onder kondisies waargeneem by xenoliete van dieselfde granite (10kb en 850circC van ’n metabasiet). Van hierdie resultaat kan afgelei word dat die oorspronklike opgetel-en-meegevoerde graniet bestaan nie meer in die S-tipe CGS en dat dit vervang is deur nuutgevormde minerale (granaat, kordieriet en biotiet). As in ag geneem word die kort tyd wat nodig is om graniete in te plaas (omtrent 100 000 jaar), wil dit voorkom dat granaat se samestelling geherekwilibreer word deur ’n oplossings-presipitasie proses. Die studie van spoorelement variasies in S-tipe CGS wys dat meeste leukokratiese samestellings is onderversadig in Zr en Ce in vergelyking met voorspellings deur eksperimentele modelle vir die oplossing van bykomstige zircon en monasiet in hulle brongebiede. Dus is S-tipe smelte meer geneig om gevorm te word in disekwilibrium in verhouding tot bykomstige mineraalstabilileit. Met die gevolg is dat die waargenome toename in spoorelementinhoud met toename in mafiese component wys dat bykomstige minerale, soos zirkoon en monasiet, word saam opgetel-enmeegevoer met peritektiese granaat in smelt om die waargenome spoorelement variasie in S-tipe graniete te verklaar. Spoorelement disekwilibrium in die CGS S-tipe granitoide benodig veral kort tye van residensie van die smelt binne die brongebied. Saam gee hierdie resultate vir die eerste keer ’n algehele antwoord vir hoof- en spoorelement variasies. Variasie in samestelling in CGS S-tipe graniete is die resultaat van bronprosesse deur ’n selektiewe optel-en-meevoer van peritektiese en bykomstige minerale. Na die optel-en-meevoer van hierdie minerale word hulle geherekwilibreer binne die magma deur ’n oplossings-presipitasie proses. Addisioneel wil dit voorkom of die konstruksie van groot S-tipe granietliggame plaasvind deur opeenvolgende toevoegings van magma lotte van verskillende samestellings wat direk uit die brongebied kom.
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Bland, A. M. "The geology of the granites of Western Jersey, with particular reference to the south-west granite complex." Thesis, Oxford Brookes University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355623.
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Riley, Dean Nolan. "Granites, orogeny, and the deblois pluton complex in Eastern Maine, USA." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1087232113.
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Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains xliv, 546 p.; also includes graphics. Includes bibliographical references (p. 517-546).
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Klimm, Kevin. "Differentiation and crystallisation processes in A-type granites an experimental study of the Wangrah Suite, Australia = Differenzierungs- und Kristallisationsprozesse in A-Typ-Graniten /." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972117229.
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Griffault, Lise. "Bilan des transferts de matière (majeurs et terres rares) dans les altérations hydrothermales des granites : exemple du granite du ballon d'alsace (vosges méridionales)." Poitiers, 1987. http://www.theses.fr/1987POIT2302.
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Etude de deux systemes d'alteration hydrothermale: - une alteration pervasive, se manifestant par la chloritisation des ferromagnesiens, le formation d'illite dans les plagioclases et la cristallisation de calcite; - une alteration a illite dans les epontes de veines liees a la mise en place de filins de fluorine. Cette etude montre que le comportement geochimique des terres rares ne peut etre assimile au comportement des elements majeurs au cours des processus hydrothermaux ou des mineraux argileux sont formes. Les mecanismes de fixation des terres rares correspondent a des phenomenes de sorption des elements sur les surfaces des particules argileuses et non a des substitutions
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Mouraouah, Az-El-Arab el. "Palingenèse du granite du Velay autour de la diorite du Peyron (Burzet, Ardèche, M.C.F.) approche pétrographique et géochimique de la genèse des granites tardimigmatitiques." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375999372.
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Griffault, Lise. "Bilan des transferts de matière (majeurs et terres rares) au cours des altérations hydrothermales des granites exemple du granite du Ballon d'Alsace, Vosges méridionales /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37605587v.
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Flatley, Kerin. "Granite Butterfly." Digital Archive @ GSU, 2009. http://digitalarchive.gsu.edu/english_diss/45.
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ABSTRACT Granite Butterfly is a novel about three women—grandmother, mother, and daughter—and the unusual attachments that break apart their family. Tuula Laine is a Rockport, Massachusetts, native of Finnish descent, whose parents moved to Cape Ann for work in the area’s granite quarries. Her life changes one afternoon when her son Henri, a brilliant surgeon who has never seriously dated anyone before, visits with his pregnant girlfriend, Coreen. Tuula immediately senses that Coreen not the right match for him in terms of age, education, or temperament, and as the couple separates and unites over the course of one summer, Tuula witnesses, for the first time, the pattern of desire and abandonment that will define their relationship. By the time Tuula’s granddaughter, Suvi, is fourteen years old, she, too, has established a destructive relationship pattern with Coreen: whenever Coreen and Henri separate, Suvi’s mother clings to her until they develop a bond closer to that of sisters than a mother and child. In the final movement of the novel, this bond, and the bond between Suvi’s parents, is finally put to the test. Granite is cut into precise blocks—dynamite is never used, lest it shatter the stone. In a few short weeks, the Laine family is pulled apart, but unlike with quarrying, there is no way to divide them in a careful manner, no way to detach them that isn’t violent and abrupt, no way to predict, or guide, where they will split.
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El, Mouraouah Az El Arab. "Palingenèse du granite du Velay autour de la diorite du Peyron (Burzet, Ardèche, M. C. F. ) : approche pétrographique et géochimique de la genèse des granites tardimigmatitiques." Clermont-Ferrand 2, 1986. http://www.theses.fr/1986CLF21030.
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Le massif dioritique du Peyron s'est mis en place à l'état magmatique dans le granite du Velay. L'intrusion basique a induit une fusion partielle du granite du Velay. Interactions chimiques a l'interface granite-diorite par thermodiffusion. Les enclaves microgrenues sombres de taille importante résultent d'un vrai mélange avec proportion variable de granite et de diorite. Les granites tardimigmatitiques liés au granite du Velay présentent des analogies pétrographiques et géochimiques avec le granite refondu du Peyron.
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Sérvulo, Ana Cláudia Oliveira. "Método de Granier e transpiração do mogno africano." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/6222.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The African Mahogany’s commercial exploitation in the Brazilian Midwest lacks information to assist management strategies of the specie and natural resources, specially water. The transpiration and growth analysis are useful, not just for water management, but also to support physiological studies. The Granier method (thermal dissipation probe – TDP) uses sap flow measurements to estimate transpiration in woody species, however it requires validate for each new specie. This paper aimed to study the African Mahogany’s water consumption and growth in the Cerrado bioma. The main activities aimed to: a) Adjust the Granier’s sap flux method to African Mahogany; b) Quantify water consumption and vegetative growth on a 2.5 years old African Mahogany’s forest, under two water regimes; c) Establish relations between tree transpiration and atmospheric water demand. This research consisted of two experiments. The first one, happened in oct-nov/2014 and feb-may/2015, consisted of the Granier’s model adjustment with aid of the lysimetry, for use in African Mahogany’s transpiration measurements. The second experiment, happened between oct/2014 and oct/2015, on a commercial forest up to 2.5 years old, evaluated water consumption (transpiration by leaf area – T) using integrated sap flux measurements by TDP, and vegetative growth [leaf area (AF), diameter at breast height (DAP), tree height (Alt), trunk volume (VTR) and leaf dry biomass (BMF)], treatments were defined as: T1 – forest with irrigation interrupted at two years old; T2 – forest without irrigation. The adjusted sap flux model to African mahogany is F k AS 6 1,231 268,25 10 , and the original Granier’s model underestimates the transpiration in 39.1%. The average potential transpiration was between 2.1 and 34.8 L day-1. In field conditions, the growth benefits from the T1 are seen in highest values for AF, DAP and BMF. However, the Alt and VTR are not significant different. The monthly T under field conditions varied between 10.2 and 24.2 L m-2, except for jul-aug/2015, when T2 transpiration was higher. The combination of bigger leaf area and low soil water content led to T1’s water deficit scenario.
A exploração comercial do Mogno Africano (Khaya ivorensis) no Centro- Oeste brasileiro carece de informações sobre a espécie para auxiliar no desenvolvimento de estratégias de ações no manejo da espécie e dos recursos naturais, em especial a água. Para tal, os estudos do processo transpiratório e de análise de crescimento são úteis, não só para o manejo da água no processo produtivo, como também para sustentar estudos fisiológicos. O método de Granier (sonda de dissipação térmica – SDT) utiliza a medida do fluxo de seiva como base para estimativa da transpiração em espécies lenhosas, todavia seu uso requer validação do modelo para cada nova espécie. Este trabalho tem como objetivo determinar consumo hídrico e o crescimento do Mogno Africano no bioma Cerrado. As atividades envolvidas visaram: a) Ajustar o modelo de Granier para estimativa da transpiração em Mogno Africano; b) Quantificar o consumo de água e o crescimento vegetativo em uma floresta a partir dos 2,5 anos de idade em dois regimes hídricos; c) Estabelecer a relação entre a transpiração das árvores e a demanda hídrica da atmosfera em condições naturais de disponibilidade de água no solo. A pesquisa constituiu de dois experimentos. O primeiro experimento foi realizado entre out-nov/2014 e fev-mai/2015 e objetivou o ajuste do modelo de Granier a partir da lisimetria na medida da transpiração do Mogno Africano. O segundo experimento foi realizado a campo entre out/2014 e out/2015, em um plantio comercial a partir de 2,5 anos de idade, avaliou-se o consumo hídrico (transpiração por unidade de área foliar – T), por meio da integração do fluxo de seiva medido com a SDT, e o crescimento vegetativo [área foliar (AF), diâmetro à altura do peito (DAP), altura (Alt), volume de tronco (VTR) e biomassa seca de folhas (BMF)]; os tratamentos foram definidos como: T1 – floresta com irrigação interrompida aos dois anos; T2 – floresta não irrigada. O modelo ajustado para o Mogno Africano é F k AS 6 1,231 268,25 10 . O modelo original de Granier subestima em 39,1% a transpiração do Mogno Africano. A transpiração potencial média foi de 13,0 L dia-1. Em campo, a superioridade do crescimento em AF, DAP e BMF prevaleceu para o tratamento T1. Porém o incremento em Alt e VTR foi similar nos dois grupos avaliados. A T em campo variou entre 10,2 e 24,2 L m-2 mês-1, respondendo diretamente à demanda evaporativa atmosférica, exceto em jul e ago/2015, nos quais T2 apresentou maior T. A combinação entre maior área foliar e baixo armazenamento de água no solo (a partir de 33,6 mm) promoveu menor transpiração à T1 devido ao esgotamento precoce da água do solo.
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M'RABET, MAAMAR Souad. "Mineralogie comparee des granites hyperalcalins." Paris 11, 1994. http://www.theses.fr/1994PA112175.
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L'etude mineralogique comparee de quatre provinces magmatiques alcalines a permis de mettre en evidence deux groupes d'environnements geodynamiques differents. Le premier est lie aux zones d'extension de type rift et comprend les granites et les monzonites alcalins du rift d'oslo (norvege), les granites alcalins de mizane et de porto (corse) et les syenites de jabel hufash (yemen). Le second groupe est lie a des cisaillements tardifs, qui ont suivi l'orogenese brasiliano, et comprend les complexes alcalins de la ceinture de cachoerinha-salgueiro du nordeste (bresil). 1) les roches du premier groupe presentent des mineralogies et des conditions physiques de cristallisation comparables: une paragenese primaire en milieu reducteur, qui evolue vers un milieu oxydant au stade subsolidus avec une predominance des mineraux fortement sodiques comme l'gyrine et l'arfvedsonite. Ces caracteristiques suggerent une mise en place a des niveaux superficiels (5 a 2 km), qui correspondent aux parties superieures des complexes annulaires. 2) les roches du second groupe contiennent des feldspaths alcalins cumulatifs, riches en ba et sr et de la titanite precoce, qui indique un milieu constamment oxydant. Les roches hyperalcalines de ce groupe se caracterisent essentiellement par la presence de mineraux calco-sodiques (augite gyrinique). Les pressions calculees d'apres les parageneses existantes montrent une mise en place a des etages structuraux plus profonds, (30 a 60 km) plus particulierement a la limite entre la croute cassante et la croute ductile. Les chambres magmatiques se sont developpees a la faveur de cisaillements lithospheriques. Le caractere oxydant est probablement lie a la circulation des fluides lors de l'activation de ces memes cisaillements
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Miller, James Thomas Ph D. Massachusetts Institute of Technology. "Crack coalescence in granite." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/47771.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2008.Includes bibliographical references.
This thesis experimentally investigates crack coalescence in prismatic Barre Granite specimens with two pre-cut, open flaws under uniaxial compression. Using a high-speed video system, crack initiation, propagation, and coalescence are observed. Flaw geometries are chosen to allow one to compare the results with those of studies in other materials as well as to better understand fracturing and coalescence processes. Specifically, the effect of ligament length (L), flaw inclination angle (p3), and bridging angle (a) on coalescence is investigated. The same crack types as in other materials are observed. Coalescence patterns observed fit into a previously developed framework (for molded gypsum and Carrara marble) with the exception of one new coalescence pattern. Crack processes and coalescence patterns suggest a more tensile behavior as grain size increases from gypsum to marble to granite. Similar to previous work in marble and granite, white patches are observed during compression tests. These white patches can be categorized as either diffuse or linear, with linear white patches further subdivided into two more types, namely boundary-following and through-going. The white patches are essentially process zones. The effect of water pressure on coalescence pattern is also investigated. Flaw water pressure is seen to affect coalescence in granite, although further work is needed.
by James Thomas Miller.
S.M.
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Wu, Jimin. "Description quantitative et modélisation de la texture d'un granite : granite de Guéret (France)." Bordeaux 1, 1995. http://www.theses.fr/1995BOR10600.
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Le travail présenté consiste en une analyse de la densité, de la taille, de la forme et de la distribution spatiale des principaux minéraux (quartz, feldspaths, biotite et muscovite) du granite de Guéret (France). Après un rappel des méthodes et techniques de l'analyse d'images, on développe trois méthodes d'acquisition d'images : méthode macro-photographique sur lames minces, méthode de saisie directe en microscopie et méthode semi-automatique par dessin manuel de la texture. Les paramètres mesures font l'objet d'une analyse statistique et d'une analyse critique par comparaison des résultats obtenus au moyen de chacune des méthodes. Les lois weibull, de laplace-gauss, et de poisson sont respectivement utilisées dans la modélisation de la distribution des tailles, de la forme et de la distribution spatiale des mineraux. Une analyse détaillée de la taille et de la distribution spatiale de biotite met en évidence une orientation privilégiée de la biotite parallèlement à une famille de fracture géometriquement bien identifiée. L'analyse des modèles de la distribution spatiale des minéraux se fait par adéquation de leur distribution expérimentale a une loi de poisson.
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Gamil, Ali Saif. "Petrology and geochemistry of Shetland granites." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316890.
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This study is concerned with the distribution, age, chemistry and geotectonic setting of the 21 granites in Shetland. The granites range in size from a few metres to 8 Km across and in age from Pre-Moine to early Carboniferous. The granites occupy a unique position in being placed approximately half way between Scotland and Norway Caledonides and about 320 Km east of southeast coast of Greenland, if Greenland is restored to its pre-continental Drift position as predicted by the best fit of Greenland and Europe. The Shetland granites have been subdivided into 5 groups according to their location to the east or west of Walls Boundary Fault ( a continuation of Great Glen Fault), mineralogical content and their occurrence in situ as granitic pebbles, as follows; Granites to the east of WBF include (1) hornblende-bearing granites (2) hornblende-free granites and (3) Granitic pebbles a) the Rova Head conglomerate & b) the Funzie conglomerate. Granites to the west of WBF include (4) Ronas Hill granite and its satellites and (5) Sandsting & Bixter granites which are grouped together because of their proximity and because the Bixter granite seems to be the acidic end product of the Sandsting granitoid. A detailed petrological and geochemical study has been made of each group. Samples from each occurrence have been examined for mineralogical content and analysed by a variety of methods for major and trace elements (XRF, INAA, RNAA). This infonnation has been used to derive the mechanisms which may have been responsible for the observed differentiation trends. To the east of the Walls Boundary Fault (WBF) are hornblende-bearing granites, hornblende-free granites and Funzie and Rova Head granitic pebbles. The hornblende-bearing granites are truncated by the WBF and characterized by high Sr and Ba values. The Spiggie granite within this hornblende-bearing group also contains considerable amounts of primary epidote. The hornblende-free granites are a miscellaneous group of granitic rocks ranging between two-mica granites and garnet bearing granites, albite keratophyre and trondhjemite dykes. To the west of WBF are Ronas Hill granophyre and its satellites (with drusy cavities containing crystals of stilpnomelane, quartz and epidote), Sandsting complex and Bixter granites. Major element modelling suggests that a plagioclase, biotite and hornblende fractionation process is appropriate for hornblende-bearing granites and Sandsting granite. Graphical and trace element modelling do not conflict with this too, but rare earth element modelling requires extraction of a quartz-feldspar phase. The classification of Shetland granitoids on the basis of ages and petrology has not been previously attempted. According to the Read classification, the Caledonian hornblende-free granites could be classified as Pretectonic and Syntectonic intrusions equivalent to his older granites. In contrast to the hornblende-bearing granites to the east ofWBF (Graven, Brae complexes and the Spiggie granite), the Graven and Brae appear to belong to the Appinite Suite while the Spiggie granite seems to be a forceful Newer Granite. According to Read the forceful Newer Granites were emplaced just after the Appinite Suite but in Shetland the Graven and Spiggie granites appear to be the same age (400 Ma). The Ronas Hill granite and its satellites, Sandsting and Bixter granites to the west of WBF are Upper Devonian granites and equivalent to the permitted last intrusions of Read, but do not appear to be of the caulderon or ring complex type typical of those in Scotland In terms of ages the hornblende-bearing granites have given K-Ar ages of about 400-430 Ma. The Ronas Hill granite and its satellites, Sandsting complex and Bixter granite give K-Ar ages about 360 Ma. Consideration of typology indicates that the hornblende-bearing granites, Ronas Hill & its satellites, the Sandsting complex and Bixter granite are I-Caledonian type whereas some of the hornblende-free granites are close to S-type. On the De La Roche classification system the Shetland granites are high-K calc-alkaline (except trondhjemite dykes and keratophyre in the hornblende-free granites group) and mostly plotted in the shoshonitic trend The geochemical comparison of the the post Devonian Ronas Hill granite and its satellites on the one hand and the closely associated late Devonian Shetland volcanics on the other, reveals that there is no link between them. A comparison of the Shetland and Scottish granitoids in terms of major, trace and rare earth elements reveals very close similarities between these two Caledonian regions. Both show the same high K-calc-alkaline (peccerillo & Taylor, 1976), the high alumina and alkali (Kuno, 1966) character, also show a general alkali-calcic character (Peacock, 1930) and they also have very good correlation in terms of some trace element variation diagrams such as Sr and Ba
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Pett, Teresa K. "Garnetites of the Cardigan Pluton - Evidence for Restite and Implications for Source Rock Compositions." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/1099.
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The Cardigan pluton, located in the southern half of New Hampshire, is a strongly peraluminous, S-type granite which is granodioritic in composition. It is inferred to have been emplaced rapidly, thrust up along west-verging nappes during the Acadian orogeny. Distinctive pods, consisting of 50 to 70 percent modal garnet, are found throughout the pluton in assemblages of garnet + sillimanite + biotite + plagioclase + quartz. These garnetite rocks present an intriguing case for restite. Textural features of the garnetite rocks, such as fibrolitic sillimanite mats and flat, unzoned major and trace-element garnet grain profiles, provide evidence for biotite dehydration melting with single-stage garnet growth from the reaction: bio + plag + qtz + kspar = gar + sill + liq. Temperatures calculated using garnet-biotite (GB) thermometry and garnet-aluminum silicate-quartz-plagioclase (GASP) barometry yield estimates between 662-714ºC and 3.8 kbars. These low calculated temperatures are most likely the result of biotite compositions which have been altered by retrograde exchange reactions. The dominant source rock for the Cardigan magmas was likely calc-pelitic to greywacke in composition. Major element modeling suggests that ~70% melting of a calc-pelitic metasediment from the Central Maine trough could have generated a granodioritic melt similar to the average granodiorite of the Cardigan pluton. However, most of the Cardigan garnetite rocks appear to have been derived from pelites, as they are too poor in CaO and Na2O. Hence, though the majority of garnetite rocks cannot represent the dominant restite of the source rocks that produced the Cardigan pluton, they do appear to be the melt-depleted residue of an unidentified pelitic source. Comparison of Nd and Sr isotopic data from garnetite and Central Maine trough metasediments permit an interpretation that the Lower Rangeley Formation, from the Central Maine trough, could be the source rock of the Cardigan magmas. However, one feldspar Pb isotopic analysis in the literature (Moench and Allienikoff, 2002) and rare monazite chemical ages near 600 Ma suggest that the Cardigan pluton does not have a Laurentian source (i.e. Lower Rangeley Formation or other Central Maine trough metasediments), whereas an inferred peri-Gondwanan basement source is permissible.
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Bresson, Vincent. "Condition humaine et transréalité : fonder la philosophie selon Jean Granier." Université Marc Bloch (Strasbourg) (1971-2008), 2008. http://www.theses.fr/2008STR20035.
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Nous montrons que Jean Granier propose, pour la distinguer de la Science, de fonder la Philosophie comme Intégralisme, en méditant la position transcendantale de l'être dans le discours philosophique et le statut du moi dans sa composition, avec le désir et les valeurs. Inspiré par Nietzsche mais en rupture avec son immanentisme, il invite à une compréhension de la philosophie comme interprétation égotiste du monde – mais aussi de son au-delà, le transréel, à partir d'une anthropologie philosophique qui met en avant l'exigence ultime du moi. L'Intégralisme propose, avec la pensée probable et par l'analyse des indices existentiels et des témoignages transcendantaux, de construire une argumentation capable de conclure à l'existence de Dieu. Jean Granier fonde donc trois types de discours philosophiques : un discours du monde, un discours du transréel et un discours du TranscendantWe point out that Jean Granier, in order to distinguish Philosophy from Science, proposes to establish the former by mulling over the transcendent position of the being in the philosophical discourse and over the status of the self in its composition, with desire and values. Inspired by Nietzsche, but having broken away from his immanentism, he invites to see philosophy as an egotistical interpretation of the world - but also of its beyond, the transreal, on the basis of a philosophical anthropology which points out the ultimate demand of the self. With the probable thought and through the analysis of the existential clues and of the transcendent evidence, integralism proposes to construct a line of argument capable to conclude that God exists. So Jean Granier founds three types of philosophical discourses: a discourse of the world, a discourse of the transreal and a discourse of the transcendent
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Georget, Yvon. "Nature et origine des granites peralumineux a cordierite et des roches associees (granite a deux micas - roches basiques) : exemple des granitoides cadomiens et hercyniens du massif armoricain (france), petrologie et geochimie." Rennes 1, 1986. http://www.theses.fr/1986REN10066.
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Etude des granites et des enclaves "basiques" associees de quelques massifs intrusifs cadomiens et hercyniens de l'armorique (france). Les analyses petrologiques et geochimiques montrent que l'ensemble des granitoides ont subi un mecanisme de cristallisation fractionnee. Ils proviennent de sources similaires et sont le resultat de melanges entre des magmas basiques et des metasediments alumineux obtenus au cours de la fusion crustale. La difference existant entre les deux types de granite, granite a cordierite et granite a biotite-muscovite est a rechercher dans leur caractere physique de mise en place (p-t-h::(2)o-fo::(2))
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Euzen, Tristan. "Pétrogenèse des granites de collision post-épaississement : le cas des granites crustaux et mantelliques du complexe de Pontivy-Rostrenen, Massif armoricain, France /." Rennes : Université de Rennes 1, Géosciences, 1993. http://catalogue.bnf.fr/ark:/12148/cb35606764q.
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Hood, John Calvin. "Acoustic monitoring of hydraulic stimulation in granites." Thesis, Colorado School of Mines, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1563447.
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Enhanced Geothermal Systems (EGS) have substantial potential as a domestic energy source and is well suited as an alternative to diversify the national energy portfolio due to its high levels of heat and recoverable energy. Hydraulic fracture stimulation of low permeability EGS reservoir rock is widely employed to develop this resource and is generally required to make unconventional resources an economically viable resource. Significant challenges for EGS technology include poor connectivity between injection and production wells during stimulation and difficulty predicting fracture growth (Tester, et al. 2006). This, coupled with notable advances in oil and gas recovery, has made hydraulic fracture mechanics the subject of considerable study.
Acoustic emissions, or microseisms, contribute greatly to these studies and have been employed on a wide range of topics in rock mechanic studies. At Colorado School of Mines, acoustic emission technology has been employed to monitor stimulation of cubic granite samples under heated and true triaxial stress environments to simulate deep reservoir conditions. Recorded AE activity was used to determine proper location of production well placement while additional analysis on the fracture process using characteristics such as wave amplitude and hit rates were used to identify stages of activity during fracture propagation. Study of the spatial and time dependence of the initiation and growth of rock fractures is critical to understanding the processes that govern fracture behavior and require details that are not accessible to alternative methods of analysis. Acoustic emissions can provide crucial information and represent an important part of rock mechanics studies.
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Lee, Su Gon. "Weathering and geotechnical characterization of Korean granites." Thesis, Online version, 1987. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.362397.
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Ghani, Azman Abdul. "Petrology and geochemistry of Donegal granites Ireland." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243112.
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Harrison, Timothy Neil. "The evolution of the eastern Grampians granites." Thesis, University of Aberdeen, 1987. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU004468.
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The Newer Granites of the Eastern Grampians form a distinctive suite of predominantly pink biotite granites, although white hornblende-bearing granites are also found. All of the plutons in the study area are composite bodies, although internal boundaries are rarely seen. They have been emplaced by stoping at crustal levels between 4.6 km, and are all currently exposed close to their roof zones. Biotite is the only mineral to show significant compositional variation, and does so in response to increasing subsolidus interaction with the fluid phase. All the pink granites are highly oxidised, and equilibrated at an fO2 of approximately 10-18 bars and temperature less than 400o C. The pink granites are highly chemically evolved, with marked enrichment in K, Si, Rb and HFS elements. The evolution of the fluid phase has played a dominant role in their geochemical evolution. The pink granites represent limited partial melts of depleted granulite, whereas the white (hornblende-bearing) granites have evolved from a melt of gabbroic lower crustal material. The granites were all emplaced between 419 and 404 Ma, and represent the transition between late, subduction-generated high-K magmas to melts generated by volatile degassing and heat focussing of a mantle source at pre-Caledonian basement lineaments.
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Michaud, Julie. "Les granites à métaux rares : origine, mise en place et mécanismes de la transition magmatique-hydrothermale." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3002.
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Les granites à métaux rares sont issus de la cristallisation de magmas très évolués enrichis en volatiles et fondants (F, Li, P, B) et en métaux tels que Sn, Nb, Ta et W. Dans la chaîne Varisque d’Europe de l’Ouest, ils résultent d’un magmatisme tardi-orogénique spécifique. Depuis les années 60, de nombreuses études se sont intéressées à la signature géochimique de ces granites et différents modèles de genèse ont pu être proposés. Malgré cela, plusieurs questions subsistent; le contexte et les mécanismes de mise en place de ces granites particuliers ne sont que rarement abordés. Afin d’avoir une vision complète des processus et mécanismes responsables de (i) la genèse des magmas à métaux rares, (ii) la géométrie et la mise en place de ces granites, (iii) leur signature géochimique et leur enrichissement en métaux, une étude multi-approches et multi-échelles a été menée sur l’exemple du granite à métaux rares d’Argemela (Zone Centro-Ibérique, Portugal). Elle a été complétée par une étude expérimentale portant sur la genèse des magmas. Les résultats de l’étude structurale montrent que l’intrusion d’Argemela se met en place dans un contexte particulier. Plusieurs critères suggèrent une remontée verticale rapide et chenalisée du magma jusqu’à un niveau très superficiel, subvolcanique. L’étude pétrologique et géochimique du granite et des minéralisations associées a permis de mettre en évidence les évènements clés et les processus mis en jeu durant la transition magmatique-hydrothermale. Ceci a également permis d’appréhender les processus de concentration/transport des métaux et les mécanismes de dépôt des minéralisations. L’étude expérimentale indique qu’un seul stade de fusion partielle à faible taux ne permet pas de générer des magmas suffisamment enrichis en métaux. Cependant, un mécanisme de refusion de restites enrichies, qui reste encore à tester, pourrait produire les concentrations en métaux requises. Enfin, cette étude démontre la nécessité de combiner les approches car l’ensemble des processus sont interdépendants dans ce type de systèmes minéralisésRare metal granites result from the crystallization of highly evolved magmas enriched in volatiles and fluxing elements (F, Li, P, B) and in metals such as Sn, Nb, Ta and W. In the Western Europe Variscan belt, these granites are attributed to a late orogenic episode of rare metal magmatism. Since the 60’s, numerous studies have focused on the specific geochemical signature of rare metal granites and several models have been proposed for their genesis. However, several questions remain and, in particular, the context and mechanisms of magma emplacement have been only rarely addressed. In order to build a comprehensive understanding of magmatic, hydrothermal and tectonic processes and mechanisms responsible for (i) rare metal magma generation, (ii) magma emplacement and geometry, (iii) specific geochemical signature and metal enrichment, a multi-approach and multi-scale study has been performed on the example of the rare metal granite of Argemela (Central Iberian Zone, Portugal). It has been complemented by an experimental study on the genesis of rare metal magmas. Results of the structural analysis highlighted the special structural context of emplacement of the Argemela intrusion. Several criteria suggest a fast vertical and channelled magma ascent up to shallow subvolcanic levels. The petrological and geochemical study of the granite and related mineralization allow the identification of key events and processes involved during the magmatic-hydrothermal transition. Mechanisms of concentration/transportation and deposition of metals have been also specified. The experimental study indicates that a single step low degree partial melting is not efficient enough to produce rare metal magmas, since most are sequestered into the restite. However, remelting of enriched restitic assemblages, a mechanism which remains to be tested, could well produce the required rare metal concentrations. Finally, this study demonstrates the necessity to combine several approaches, since processes and mechanisms are interrelated in these mineralized systems
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Shaw, Andrew. "The petrogenesis of Hercynian granites, French massif central." Thesis, Birkbeck (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397092.
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Poole, Jason. "Radon release from granites in south-west England." Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394062.
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Belkasmi, Mohammed. "Péthographie et géochimie des granites à métaux rares." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL087N.
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Les micas et les niobotantalates sont utilisés comme traceurs de l'évolution petrogénétique des granites à métaux rares (GMR) en provenance de plusieurs localités. Ces GMR ne présentent pas le même degré de différenciation mais sont tous caractérisés par un enrichissement en volatils et en métaux rares. Les micas et les niobotantalates dans ces granitoïdes, montrent plusieurs types de variations: 1) du cœur vers la bordure des cristaux (enrichissement en volatils et métaux rares) et 2) depuis les faciès les moins différenciés vers les plus différenciés (cristallisation de micas lithiques, et de manganocolumbite tantalifere). Les zonations discontinues révèlent des étapes intermédiaires de l'évolution. La cristallochimie de ces minéraux, en plus de critères texturaux et géochimiques montrent que les processus magmatiques sont dominants dans la genèse des granites à métaux rares étudiés. On ne peut cependant pas exclure l'intervention de phénomènes métasomatiques. L'étude des micas a permis également de mettre en évidence différents mécanismes impliquant des phases fluides externes au système magmatique (cristallisation sub-solidus, dilution des fluides magmatiques, contamination par l'encaissant métamorphique. . . ). Ces phénomènes sont très développés dans le granite de montebras mais ne semblent pas avoir de rôle déterminant dans les enrichissements en métaux
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CHEN, TING YU. "Geologie des granites de la chine du sud." Paris 6, 1989. http://www.theses.fr/1989PA066100.
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Sont etudies un ensemble de granitoides d'ages varies (varisques ou indonesiens) d'un point de vue cadre geologique, mineralogique (mineraux cardinaux et accessoires), geochimie (elements majeurs et en traces), geochronologie et structure. Sont plus particulierement mis en evidence une evolution des caracteres petrographiques et chimiques (sio#2, na#2o, k#2o, cao, ree) en fonction de l'evolution structurale de la region, ainsi qu'une repartition des divers granitoides en plutonites orogeniques et plutonites anorogeniques
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Graham, Nigel Thomas. "Fabric studies in the Galway Granite, Ireland." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362002.
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Al-Hafdh, Nabeel Mustafa Suliman. "The alteration petrology of the Cheviot granite." Thesis, University of Newcastle Upon Tyne, 1985. http://hdl.handle.net/10443/1866.
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The Cheviot Granite complex is a high-level pluton made up of six intrusive phases intruded into a pile of andesites of very similar composition to the bulk of the plutonics. The whole represents the eroded remnant of a lower Devonian volcano, erupted immediately after the continental collision that destroyed the Iapetus Ocean. The igneous history comprises two igneous cycles, both starting with basic granodiorite and including a late porphyritic ring dyke. The two cycles can be distinguished geochemically using Zr and K contents. Fractionation during each cycle involved precipitation of a biotite diorite cumulate. The second cycle ends with a highly evolved leucocratic microgranite. The geochemistry shows a rather shoshonitic - chemistry to the series, and trace elements are consistent with an immediately post-collisional origin. Hydrothermal alteration occurs in two phases, one associated in space and time with the porphyritic granodiorite of the first igneous cycle, and the other with that of the s~cond cycle. In both systems both potassic and sericitic alteration assemblages are found, and there is a wide development of propylitic alteration around these higher temperature zones. The two hydrothermal phases can be distinguished by the abundance of tourmaline in sericitic and propylitic rocks of the second cycle, and the abundance of calcium (mostly as calcite) in the sericitic rocks of the first phase. Geochemical flux calculations show that silica has been widely introduced to the granite during the alteration (in amounts up to 10\) and Ca and Sr removed. Other element fluxes are more complex, and may be coupled together. Comparison with other granites of N England and S Scotland shows that the Loch Doon complex and the Shap granite are very similar to Cheviot, that the Criffell Dalbeattie granite has a very similar early phase but diverges later, and that the Skiddaw, Weardale and Cairnsmore of Fleet granites are very different from Cheviot, being essentially granitic rather than granodioritic.
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Lee, In-Keun. "Mechanical behaviour of compacted decomposed granite soil." Thesis, Online version, 1991. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.292710.
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Kruszewska, Barbara M. "The xenolithic suite of the Strontian Granite." Thesis, London Metropolitan University, 1990. http://repository.londonmet.ac.uk/3153/.
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The Strontian Granite in Argyllshire. is a composite pluton of late Caledonian age, emplaced into Moinian psammitic and pelitic rocks. It is composed of an outer tonalitic granodiorite (dated at 435 Ma.) passing into a porphyritic granodioritic, both xenolithic, and intruded by a younger alkali granite (ca. 400 Ma.).
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Euzen, Tristan. "Pétrogenèse des granites de collision post-épaississement : Le cas des granites crustaux et mantelliques du complexe de Pontivy-Rostrenen (Massif Armoricain~ France)." Phd thesis, Université Rennes 1, 1993. http://tel.archives-ouvertes.fr/tel-00626840.
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Dans la chaîne hercynienne d'Europe occidentale, la majeure partie des granitoïdes se mettent en place en contexte de collision continentale, mais postérieurement à l'épaississement. Ce sont des granitoïdes de collision, postépaississement. L'exemple étudié est le complexe granitique de Pontivy-Rostrenen (Massif Armoricain, France). Il est constitué d'une association de granitoïdes variés parmi lesquels quatre principaux types sont reconnus. Des granites à deux micas fortement peralumineux, un leucogranite très évolué (plus acide), un monzogranite à biotite peralum ineux et une monzodiorite potassique. L'étude pétrographique et géochimique (majeurs, traces, isotopes) de ces granitoïdes et de leurs relations mutuelles, nous a permis d'élaborer un modèle pétrogénétique, mettant en évidence trois épisodes de fusion crustale, faisant appel à des mécanismes et à des sources différents: - fusion partielle à grande échelle, résultant du rééquilibrage thermique de la croûte et favorisée par la circulation de fluides drainés par le cisaillement sud armoricain; - fusion induite par l'ascension de magmas lamprophyriques dans la croûte, avec production de magmas hybrides; - fusion d'un niveau crustal différent, probablement plus superficiel donnant naissance à un magma très évolué, de basse température; L'étude d'une telle association permet d'approcher indirectement les mécanismes de fusion crustale et la nature des diverses sources activées lors du rééquilibrage d'une chaîne épaissie.
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Euzen, Tristan. "Petrogenese des granites de collision post-epaississement : le cas des granites crustaux et mantellique du complexe de pontivy-rostronen (massif armoricain, france)." Rennes 1, 1993. http://www.theses.fr/1993REN10061.
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Dans la chaine hercynienne d'europe occidentale, la majeure partie des granitoides se mettent en place en contexte de collision continentale, mais posterieurement a l'epaississement. Ce sont des granitoides de collision, post-epaississement. L'exemple etudie est le complexe granitique de pontivy-rostrenen (massif armoricain, france). Il est constitue d'une association de granitoides varies parmi lesquels quatre principaux types sont reconnus. Des granites a deux micas fortement peralumineux, un leucogranite tres evolue (plus acide), un monzogranite a biotite peralumineux et une monzodiorite potassique. L'etude petrographique et geochimique (majeurs, traces, isotopes) de ces granitoides et de leurs relations mutuelles, nous a permis d'elaborer un modele petrogenetique, mettant en evidence trois episodes de fusion crustale, faisant appel a des mecanismes et a des sources differents: fusion partielle a grande echelle, resultant du reequilibrage thermique de la croute et favorisee par la circulation de fluides draines par le cisaillement sud-armoricain; fusion induite par l'ascension de magmas lamprophyriques dans la croute, avec production de magmas hybrides; fusion d'un crustal different, probablement plus superficiel donnant naissance a un magma tres evolue, de basse temperature. L'etude d'une telle association permet d'approcher indirectement les mecanismes de fusion crustale et la nature des diverses sources activees lors du reequilibrage d'une chaine epaissie
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To, Chiu-yin. "A unified elasto-plastic model for saturated loosely compacted completely decomposed granite." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/b40203554.
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Yan, Wai Man. "Experimental study and constitutive modelling of re-compacted completely decomposed granite /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20YAN.
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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 168-177). Also available in electronic version. Access restricted to campus users.
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Pembroke, James William. "The recognition and significance of magma mixing in granites." Thesis, Oxford Brookes University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364075.
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Aboazoum, Ali Saleh Ali. "Petrogenesis of Palaeocene granites, Island of Skye, N.W. Scotland." Thesis, University of Glasgow, 1995. http://theses.gla.ac.uk/6432/.
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This thesis documents an investigation of selected intrusions of the Palaeocene granites on the Isle of Skye, and includes: petrography, mineral chemistry (include REE concentrations) fluid inclusions, whole rock major-, trace- and rare-earth-elements, together with stable oxygen and hydrogen and Sr-Nd isotope geochemistry on whole rocks and mineral separates. The data presented indicate that the granites are geochemically related and have been severely affected by 'associated' hydrothermal fluid(s), especially the Loch Ainort Granite. The hydrothermal fluids most likely represent the limited mixing between magmatic and meteoric waters in Beinn an Dubhaich Granite. In contrast, the other granites are likely to have been affected by meteoric water alone, with water-rock interaction having occurred below 500°C.The coarsening of granophyric texture outwards from alkali feldspar phenocrysts, the low concentration of Fe3+ in pyroxenes, together with the slight variations in Fe2+: Mg ratio of biotites, suggest a slow cooling history for the granites. The (two feldspar) Beinn an Dubhaich and Glamaig granites have small negative Eu anomalies compared with the (single feldspar) Loch Ainort and Marsco granites, suggesting the important role of plagioclase fractionation during granite evolution. The most important reservoirs for the REE in the Skye granites are amphibole, pyroxene and apatite. The inflection present in the plot of MnO against SiO2, the non-linear and divergent relationships between K2O, Rb, Sr and ?Nb against SiO2, and the presence of an anomalous group of granites which are characterised by low Zr, Y and Nb, but with high SiO2 contents, mitigates against simple mixing as the dominant process responsible for the compositional diversity of the granites.
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Rousselin, Thierry. "Télédétection thermique des granites uranifères du nord Limousin (France)." Nice, 1985. http://www.theses.fr/1985NICE4067.
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Guineberteau, Bruno. "Le Massif granitique de Mortagne-sur-Sèvre, Vendée : structure, gravimétrie, mise en place : distribution de U-Th-K /." Vandœuvre-les-Nancy : Centre de recherches sur la géologie de l'uranium, 1986. http://catalogue.bnf.fr/ark:/12148/cb348665320.
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Linklater, Michael Anthony Leonard Flanders. "The exploration for and possible genesis of, some Archaean granite/gneiss-hosted gold deposits in the Pietersburg granite-greenstone terrane." Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1005557.
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Abstract The gold mineralization event within Archaean granite-greenstone terranes occurred during the late Archaean, and followed the intrusion of syn- to late-tectonic granitic plutons into previously deformed greenstone belts. An Archaean granite/gneiss-hosted gold deposit, in terms of this project, is classified as having a gold-assay cutoff of 1g/metric ton over widths of at least several metres, or higher grades over narrower widths and/or verbal descriptions that indicate such values. Fluid inclusion studies and isotopic data identify two possible origins for the auriferous fluids; namely magmatic and metamorphic. The exploration target according to the magmatic model, is a late-Archaean, hydrothermally altered, mineralized and fractured granitic intrusion preferably with a granodioritic or quartz-dioritic composition. The exploration target according to the metamorphic replacement model is a granitic stock that has intruded a zone of crustal weakness such as a shear zone, active during the late Archaean. Alternatively, the granitic intrusion should be affected by regionally extensive late-Archaean shearing. It should be hydrothermally altered, deformed and mineralized. Five areas within the Pietersburg granite-greenstone terrane were selected for the 'Regional Area Selection' phase of exploration for Archaean granite/gneiss-hosted gold deposits; namely Roodepoort, Waterval, Ramagoep, Moletsie and Matlala. Roodepoort contains a known granodiorite-hosted gold deposit; the Knight's Pluton, and served as an orientation survey for this project. The use and interpretation of LANDSAT images formed an integral part of exploration techniques; to assess their usefulness in the exploration of Archaean granite/gneiss-hosted gold deposits. Area selection criteria for granite/gneiss-hosted gold mineralization at Roodepoort are the major ENE-trending shear zone, the NNW-trending lineament and hydrothermal alteration, shearing, quartz-stockworks and sulphide mineralization within the Knight's Pluton. The origin of the gold within the Knight's Pluton is uncertain; both magmatic and metamorphic models are possibilities. Ongoing exploration is in progress at Roodepoort. The only area selection criterion for granite/gneiss-hosted gold mineralization at Waterval is the sericitized, subcropping granites located within trenches. Gold mineralization is insignificant. No area selection criteria for Archaean granite/gneiss-hosted gold mineralization were located at Ramagoep, Matlala and Moletsie. No further exploration is recommended for all these areas. The MES image interpretations were successful in identifying lineaments, granitic outcrops, greenstones, vegetation and soil cover. The Clay-iron images adequately differentiated betweeen iron-rich and clay-bearing areas. However, not all clay-bearing areas were associated with hydrothermal alteratian; field checks were necessary to discriminate between weathered granites and hydrothermally altered granites. The Wallis images served to locally enhance the contrasts of the MES and Clay-iron images.
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MABKHOUT, FIEDOUA. "Les granites permiens des rehamna de l'azegour (maroc) : petrographie, mineralogie et geochimie. comparaison avec un massif corse: vico-sposata. signification de ces granites." Paris 11, 1990. http://www.theses.fr/1990PA112293.
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Au maroc, deux massifs granitiques permiens se distinguent des autres granites marocains: azegour et rehamna (sebt-brikiine), par leur age relativement plus jeune (270 ma), une couleur rouge due aux inclusions d'hematite dans les feldspaths, des rapports du sr initiaux assez bas (0,7051-0,7055) et de nd assez eleves indiquant une origine mantellique. Ces deux massifs presentent des biotites tardives et des quartz automorphes. Leur composition est alcaline et sursaturee en silice. Le massif des rehamna est compose de quatre venues granitiques a caracteres identiques, les micas noirs sont ferriferes passant des annites aux siderophyllites et les zircons forment des populations typiques des granites alcalins subsolvus a biotite, les profils de terres rares presentent une forte anomalie en eu et un enrichissement en terres rares lourdes. Ces caracteres apparentent ce massif aux granites alcalins. Le massif d'azegour presente des caracteres moins evolues: des biotites plus magnesiennes, une population bimodale de zircons, des profils de terres rares a assez faible anomalie en eu. Ces caracteres rapprochent ce massif des granites tardi a post-tectoniques. En comparaison, un massif granitique corse a ete etudie: vico-spozata. Ce massif presente des caracteres intermediaires entre les rehamna et azegour (biotites, zircons, profils de terres rares). Il presente egalement un chimisme alcalin. Les biotites de ces trois massifs forment une serie complete depuis les biotites magnesiennes jusqu'aux siderophylites en passant par les annites. Ces trois masifs illustrent au permien moyen la transition orogenique-anorogenique apres la mise en place des granites orogeniques tardi-hercyniens. En plus, rehamna et azegour constituent un jalon de plus dans la province alcaline permo-triasique de mediterranee occidentale
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Shin, Jong Ho. "Numerical analysis of tunnelling in decomposed granite soil." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368048.
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Dumont, Aaron A. "Bodwell; king of the "Granite Ring" 1852-1922." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1089914885.
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Li, Qiuyi Bing. "Acoustic emissions in hydraulic fracturing of Barre granite." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99581.
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Thesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 147-148).
The purpose of this work is to observe acoustic emissions (AE) generated by laboratory scale hydraulic fracturing of Barre granite specimens with single or double flaw geometry. The scope of this work covers the experimental setup and subsequent analyses of these acoustic emissions, which in essence are elastic waves generated by displacements occurring within the rock specimen. Acoustic emissions can be analysed in a number of ways, whether individually or grouped together into events when a number of emissions arrive together. Individual emissions can be analysed for their amplitude, energy, or their frequency content while the source location and source mechanism can be inferred from events. The AE data are analysed in conjunction with water pressure, high resolution images, and high speed video taken during the experiment. Section 3 of this work outlines the selection and subsequent modification of the AE acquisition system with a specific focus on capturing AE at the end of each experiment in order to compare results to high speed video. This section describes the initial equipment selection, as well as initial experiments where it was noted that crucial data were missing around the time of the fracture event. This issue was largely resolved by modifying the system parameters as well as upgrading the PC supporting the AE acquisition cards. Section 4 of this work describes analysis of one experiment, providing an in-depth start-to-finish account of the nature of acoustic emissions at different phases of the experiment. This section also considers all of the hydraulic fracture experiments performed at different vertical loads and specimen flaw geometries, and draws some tentative conclusions regarding hydraulic fracturing in granite.
by Qiuyi Bing Li.
S.M.
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Shariati, Hossein. "Mechanical modeling of granite subjected to contact loading." Licentiate thesis, KTH, Hållfasthetslära (Avd.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263592.
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The mechanical properties of Bohus granite subjected to contact loading is investigated based on experimental and numerical results. An elasto-plastic constitutive material model combined with a damage description is employed. The material model parameters are determined based on experimental results. Any kind of inelastic deformation except the tensile failure is described by a linear Drucker-Prager (DP) plasticity model with variable dilation angle. As for the damage description, an anisotropic damage model (DFH model) is considered to account for the tensile failure (i.e. mode I fracture). The resulting constitutive model is implemented numerically to simulate the mechanical behavior of the material under indentation loading up to its load capacity. In paper A, the DP material model parameters are calibrated based on quasioedometric tests performed in an earlier work. It is described how the yield surface and dilation angle are determined from this test. The calibrated material model is implemented numerically in a commercial finite element software. The numerical model is validated based on quasi-static spherical indentation tests performed in this work. The force-penetration (P-h) response of the material is recorded during the indentation tests. Moreover, a high speed camera is utilized to observe the specimen surface around the contact area during the indentation test. It is detected that the observed load-drops in the P-h response correspond to material removals on the specimen surface. The tested specimens are also scanned by X-ray tomography to investigate the fracture pattern. In paper B, the anisotropic DFH damage model is employed in order to predict the fracture pattern observed in the indentation test. The chosen damage model considers the heterogeneity in the material tensile strength. It is described how the statistical distribution of the tensile strength is calibrated. The calibrated DFH model is combined with the DP model and the resulting DP-DFH model is utilized to simulate the P-h response and the fragmentation process of Bohus granite subjected to quasi-static contact loading.Examinator: Professor Mårten Olsson, KTH, Stockholm
QC 20191108
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Dumont, Aaron. "Bodwell: King of the “Granite Ring” 1852-1922." Ohio University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1089914885.
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Labarta, Charlie. "L'utilisation du granite dans les temples de Karnak." Thesis, Montpellier 3, 2014. http://www.theses.fr/2014MON30077.
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Dès le début de leur histoire, les Égyptiens ont réussi à maîtriser l'extraction et la taille du granite dans les carrières d'Assouan. Cette roche, réputée pour sa dureté, est particulièrement appréciée au Nouvel Empire où son exploitation prend une importance sans précédent. Les temples de Karnak, lieux de cultes majeurs à cette époque, constituent à ce titre les sites d'érection privilégiés de ces monuments en granite, à l'image des quinze obélisques qui furent, pendant un temps, dressés dans l'enceinte d'Amon. L'utilisation de ce matériau ne se limite cependant pas à ces monolithes ; il a également été employé pour de nombreux éléments d'architecture, de statuaire et de mobilier de culte.S'inscrivant dans une démarche pluridisciplinaire comprenant une approche égyptologique, géologique et technique, cet ouvrage propose une étude sur ces réalisations à travers le prisme du site de Karnak, suffisamment riche pour être, dans une certaine mesure, représentatif de l'utilisation générale du granite dans les temples de l'Égypte ancienneFrom the beginning of their history, the Egyptians have acquired an expert knowledge of granite quarrying and cutting in Aswan region. This stone, whose hardness made it famous, has been particularly used during the New Kingdom, when it got an unprecedented importance. The Karnak temples, as major cult spots at that time, have been a privileged site for the erection of monuments made from granite, as reflected by the fifteen obelisks which stood in the Amon enclosure for centuries. Its usage has not been limited to these large monolith pieces ; it has also been shaped in a tremendous amount of architectural elements, statues and objects for worship.Following an interdisciplinary approach combining an egyptological, a geological and a technical study, this work presents an investigation of granite monuments through the prism of the Karnak temples, whose history spreads far enough to be representative, in some way, of the general use of granite in ancient Egypt temples
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Roman, Berdiel Maria-Teresa. "Mécanismes d'intrusion des granites supracrustaux : Modèles analogiques et exemples naturels." Phd thesis, Université Rennes 1, 1994. http://tel.archives-ouvertes.fr/tel-00675435.
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Ce travail est une contribution à l'étude de l'intrusion des granites supracrustaux dans les domaines orogéniques. Les objectifs sont de déterminer comment ces intrusions se mettent en place, et comment se crée l'espace nécessaire pour l'accommodation du magma dans l'encaissant. Notre étude a consisté en deux travaux complémentaires : (1) Une revue bibliographique des exemples naturels fournis par les granites hercyniens de l'arc ibéro-armoricain (chaîne varisque), ainsi qu'une étude structurale d'un massif sur le terrain, et (2) une étude expérimentale des conditions de formation des laccolites et de la géométrie des intrusions mises en place en contexte de tectonique active. L'exemple des granites syntectoniques de l'arc ibéro-armoricain souligne que beaucoup de ces massifs ont généralement des géométries de type laccolite. Ils se son~ mis en place par expansion latérale, soit dans une couverture sédimentaire ductile au-dessus d'un socle plus résistant, soit le long de zones de cisaillement ductile majeures. L'étude expérimentale concerne les mécanismes de mise en place des granites dans une croûte supérieure. Les résultats permettent d'expliquer beaucoup des caractéristiques des granites syntectoniques, en montrant en ~articulier que: (1) La formation d'un laccolite nécessite l'existence d'une couche de faible résistance entre deux unités résistantes, (2) l'épaisseur critique de la couche de faible résistance nécessaire à la formation d'un laccolite diminue avec l'augmentation de la profondeur, (3) la géométrie des intrusions reflète le contexte tectonique régional régnant lors de leur mise en place. La mise en place de granites le long de zones de décrochement d'échelle crustale ne nécessite pas la création de vides ou l'existence de zones d'extension locale. Dans nos modèles, les intrusions en régime décrochant se mettent en place dans la direction d'élongation maximale de l'ellipsoïde de déformation, les structures fragiles ne contrôlant que d'unl3 manière secondaire la géométrie des intrusions. Les intrusions en régime extensif montrent une forme asymétrique avec un front à fort pendage et une langue basale cisaillée à l'arrière.
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Scrimgeour, Ian. "Early Proterozoic metamorphism at the Granites gold mine, Northern Territory /." Adelaide, 1989. http://web4.library.adelaide.edu.au/theses/09SB/09sbs434.pdf.
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Roman, Berdiel Maria Teresa. "Mécanismes d'intrusion des granites supracrustaux : modèles analogiques et exemples naturels /." Rennes : Géosciences, Université de Rennes I, 1995. http://catalogue.bnf.fr/ark:/12148/cb357722869.
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