Relevant bibliographies by topics / Porphir

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Porphir'

Author: Grafiati
Published: 10 March 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Porphir.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Porphir"

1

Kruk, Mikalai M., Aleksander S. Starukhin, and Rafal Czerwieniec. "Temperature-dependent phosphorescence spectra of Pd- and Pt-porphins and their applications." Journal of Porphyrins and Phthalocyanines 12, no. 11 (November 2008): 1201–10. http://dx.doi.org/10.1142/s1088424608000583.

Full text
Abstract:
In this paper the temperature dependence of radiative deactivation of Pd - and Pt -porphin triplet states in Shpol'skii matrices has been studied in the temperature range of 4.2-210 K. Dramatic changes in the phosphorescence spectra, with increasing temperature, were observed. It has been proposed that this is due to the inclusion of thermally activated states of the studied molecules in the processes of radiative deactivation of triplet states. For Pd -porphin the T 1 → S 0 emission is merely observed at liquid helium temperature. An increase in temperature leads to the activation of several radiative T i → S 0 transitions, so additional bands appear in the phosphorescence spectrum. In the case of Pt -porphin, temperature activation takes place as early as at liquid helium temperature. The degeneracy lifting of lowest T 1,2 states due to crystal field splitting was observed for both Pd - and Pt -porphins. The splitting value δ = ΔE( T 2 − T 1) has been measured in different matrices and the dependencies on both the metal ion in the given matrix and the matrix type for the given metal ion, have been revealed. The possibility of designing the luminescent molecular thermometers for cryogenic temperatures based on the high temperature sensitivity of the Pd - and Pt -porphin phosphorescence in n-alkane matrices, has been discussed. The workability of the dependence of Pd - and Pt -porphin phosphorescent properties on temperature in the design of the molecular thermometer family for the temperature range from a few K up to temperatures close to the melting point of n-alkane matrix (150-200 K) is demonstrated.
APA, Harvard, Vancouver, ISO, and other styles
2

Lafleur, Claude, and Joanne Carrier. "Ockham : logique et universaux isagogiques." Dossier 76, no. 2 (May 25, 2021): 197–223. http://dx.doi.org/10.7202/1077445ar.

Full text
Abstract:
En tant qu’introduction générale aux commentaires d’Ockham sur la logique, celle de Porphyre et d’Aristote, l’Expositionis in libros artis logice Prohemium traite la nature de cette discipline, de son sujet, de son utilité, de sa spécificité et de son statut épistémologique. La nouvelle traduction française ici offerte est accompagnée d’une édition annotée qui restitue l’orthographe médiévale du latin d’Ockham. Il en va de même pour la nouvelle traduction du début du premier commentaire logique d’Ockham, l’Expositio in librum Porphirii De predicabilibus, dont le moment fort est l’interprétation des questions de Porphyre sur les universaux (genres et espèces).
APA, Harvard, Vancouver, ISO, and other styles
3

Redwood, Stewart D. "The Origin of the Porphyry Deposit Name: From Shellfish, Tyrian Purple Dye, and Imperial Rome to the World’s Largest Copper Deposits." SEG Discovery, no. 118 (July 1, 2019): 1–15. http://dx.doi.org/10.5382/segnews.2019-118.fea.

Full text
Abstract:
Abstract The porphyry deposit name has a long and fascinating etymological history of over 3,000 years. “Porphyry” is derived from the ancient Greek word porphyra (πoρϕύρα), or purple. It was originally applied to a rare purple dye, Tyrian purple, extracted by the Phoenicians from murex shells. It was later applied to a prized purple porphyritic rock, Imperial Porphyry or Porfido rosso attico, quarried by the Romans from Mons Porphyrites in the Eastern Red Sea hills of Egypt from the first to fifth centuries A.D., and used as a monumental stone in Imperial Rome and Byzantium (Istanbul). The name evolved in the field of igneous petrology to include all rocks with a porphyritic texture, regardless of their color. Mining of the first porphyry copper deposits, which were originally called disseminated or low-grade copper deposits, started in 1905. As a result of the close spatial and genetic relationship to porphyry stocks, they became known as porphyry copper deposits. The term was first used by W. H. Emmons in his 1918 textbook The Principles of Economic Geology, but it was originally used more as an engineering and economic description, as in Parsons’ 1933 book The Porphyry Coppers. It was slow to catch on in the geological literature. It was first used in the title of a paper in Economic Geology in 1947 but did not gain widespread use until the 1970s, following the publication of seminal papers on porphyry models and genesis by Lowell and Guilbert (1970) and Sillitoe (1972, 1973).
APA, Harvard, Vancouver, ISO, and other styles
4

Mastrocinque, Attilio. "The Mithraic praesepia as Dining Beds." Acta Antiqua Academiae Scientiarum Hungaricae 58, no. 1-4 (December 2018): 421–26. http://dx.doi.org/10.1556/068.2018.58.1-4.25.

Full text
Abstract:
Summary A mithraeum always has long benches, which were called praesepiae, “places where cattle are fed in a stall” (CIMRM 233). The name is inappropriate for a dining room, which was usually called, instead, triclinium. Mithraeum is the current modern name, whereas the ancients called it spelaeum, antrum, templum. Another important name was Leonteum, which was not a separate cultic place for Leones only, because Porphyry states that the members of a Mithraic community were the Leones and the servants were called Korakes, the Ravens (Porphyr. de abst. 4. 16). The Mithraic menu apparently consisted of meat rather than of vegetables, even though one should take into account the fact that bones are better preserved than vegetables in an archaeological site, and therefore they are often published, whereas vegetal remains had never been investigated by means of chemical analyses. Lions are notoriously carnivorous and the praesepiae had to be filled with meat for the Leones. The initiation of Leones was supposed to be dry and fiery (Tert. Adv. Marcionem I 13), and we are also told that the Mithraic Leones avoided water for their purifications and washed their hands with honey (Porph. De antro 15–16). Moreover, a lion and a snake are often depicted on Mithraic reliefs as going to drink from a crater. It is possible to get some information from those facts about what Leones were used to drinking during their symposia: they were thirsty but their drink could not be water, but eventually, wine was permitted. Iustin. Apol. I 66 speaks of a cup of water, but only to mention some ritual acts during initiations and not during symposia.
APA, Harvard, Vancouver, ISO, and other styles
5

Lim, Richard. "The auditor Thaumasius in the Vita Plotini." Journal of Hellenic Studies 113 (November 1993): 157–60. http://dx.doi.org/10.2307/632405.

Full text
Abstract:
In his Vita Plotini, Porphyry recounts a colourful episode which, for a brief moment, brings to life the dynamics within the lecture room of Plotinus in Rome. The author explains how he was in the habit of posing questions to Plotinus frequently and persistently while his teacher was conducting his philosophical discourse before a mixed body of listeners. On one occasion, such an exchange between the two over the issue of the connexion between the soul and the body continued intermittently over a period of some three days, with the following outcome (Porph. V. Plot. xiii 12-15):
APA, Harvard, Vancouver, ISO, and other styles
6

Broom, J. E., W. A. Nelson, W. A. Jones, C. Yarish, R. Aguilar Rosas, and L. E. Aguilar Rosas. "PORPHYRA SUBORBICULATA, PORPHYRA CAROLINENSIS AND PORPHYRA LILLIPUTIANA ‐ THREE NAMES FOR ONE SMALL PORPHYRA." Journal of Phycology 36, s3 (December 2000): 7–8. http://dx.doi.org/10.1046/j.1529-8817.1999.00001-21.x.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Kim, Su Yeon, Won Kyong Cho, Hye-In Kim, Seung Hye Paek, Sung Joo Jang, Yeonhwa Jo, Hoseong Choi, Jeong Hun Lee, and Sang Hyun Moh. "Transcriptome Profiling of Human Follicle Dermal Papilla Cells in response to Porphyra-334 Treatment by RNA-Seq." Evidence-Based Complementary and Alternative Medicine 2021 (January 13, 2021): 1–15. http://dx.doi.org/10.1155/2021/6637513.

Full text
Abstract:
Porphyra-334 is a kind of mycosporine-like amino acid absorbing ultraviolet-A. Here, we characterized porphyra-334 as a potential antiaging agent. An in vitro assay revealed that porphyra-334 dramatically promoted collagen synthesis in fibroblast cells. The effect of porphyra-334 on cell proliferation was dependent on the cell type, and the increase of cell viability by porphyra-334 was the highest in keratinocyte cells among the three tested cell types. An in vivo clinical test with 22 participants demonstrated the possible role of porphyra-334 in the improvement of periorbital wrinkles. RNA-sequencing using human follicle dermal papilla (HFDP) cells upon porphyra-334 treatment identified the upregulation of metallothionein- (MT-) associated genes, confirming the antioxidant role of porphyra-334 with MT. Moreover, the expression of genes involved in nuclear chromosome segregation and the encoding of components of kinetochores was upregulated by porphyra-334 treatment. Furthermore, we found that several genes associated with the hair follicle cycle, the hair follicle structure, the epidermal structure, and stem cells were upregulated by porphyra-334 treatment, suggesting the potential role of porphyra-334 in hair follicle growth and maintenance. In summary, we provided several new pieces of evidence of porphyra-334 as a potential antiaging cosmetic agent and elucidated the expression network in HFDP cells upon porphyra-334.
APA, Harvard, Vancouver, ISO, and other styles
8

MIGACHEV, Igor, Vadim ZVEZDOV, and Olga MININA. "Formational types of porphyry copper deposits and their ore-magmatic systems." Domestic geology, no. 1 (March 21, 2022): 26–48. http://dx.doi.org/10.47765/0869-7175-2022-10002.

Full text
Abstract:
Two individual ore-formational types have been identified within the porphyry copper family: the gold-copper-porphyry and molybdenum-copper-porphyry ones. The fundamental difference between them lies in their geotectonic position that determines the origin and composition of fertile magmatic source, as well as other features the composition of ore-bearing porphyry intrusions, the mineralogical and geochemical features of ores, and the pattern of metasomatic and ore zonation. In this study, we investigated porphyry copper ore-magmatic systems with complex metallogeny, or complex porphyry copper systems (CPCS), where porphyry copper deposits constitute the core elements spatially associated with mineralization of other ore-formational types. Based on a set of conjugated and combined types of ore mineralization we established the differences between diorite-related gold-copper-porphyry CPCS, formed in basaltic volcano-plutonic belts, and granodiorite-monzonite-related molybdenum-copper-porphyry CPCS, formed in andesite belts. These differences confirm the validity of the distinction of the two ore-formational types of deposits of the porphyry-copper family.
APA, Harvard, Vancouver, ISO, and other styles
9

Sheinin, Vladimir B., Sergey A. Shabunin, Elena V. Bobritskaya, Tatiana A. Ageeva, and Oscar I. Koifman. "Protonation Equilibriums of Porphin, 5,10,15,20-Tetraphenylporphin, 5,10,15,20-Tetrakis(4’-sulfonatophenyl)­porphin in Methanol." Macroheterocycles 5, no. 3 (2012): 252–59. http://dx.doi.org/10.6060/mhc2012.120989s.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Li, Weidong, Zhihong Wei, Boyang Wang, Yuan Liu, Haoqiang Song, Zhiyong Tang, Bai Yang, and Siyu Lu. "Carbon quantum dots enhanced the activity for the hydrogen evolution reaction in ruthenium-based electrocatalysts." Materials Chemistry Frontiers 4, no. 1 (2020): 277–84. http://dx.doi.org/10.1039/c9qm00618d.

Full text
Abstract:
The Ru supported on Porphyra-CQDs exhibited better dispersibility and the highest activity compared with biomass Porphyra and Porphyra activated carbon owing to the strong coordination interactions between Ru and CQDs.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Porphir"

1

Lecerf, Adrien. "Ordre et variation : essai sur le système de Jamblique." Thesis, Paris, EPHE, 2015. http://www.theses.fr/2015EPHE5071.

Full text
Abstract:
Cette thèse se propose de donner une synthèse générale du système du néoplatonicien Jamblique de Chalcis, acteur important de l’évolution de la métaphysique grecque durant l’âge antique tardif. Elle reconstruit tour à tour sa doctrine psychologique, sa hiérarchie des êtres et quelques-uns de ses concepts fondamentaux, en mettant l’accent sur l’histoire des idées entre le fondateur de l’école, Plotin, et la naissance de l’école néoplatonicienne d’Athènes. L’ensemble des œuvres laissées par Jamblique est exploité, ainsi que les quelque 800 fragments et témoignages sur sa vie et sa doctrine laissés par les auteurs postérieurs. Les influences subies sont analysées et replacées en contexte : néoplatonisme de Plotin et Porphyre, qui donne à Jamblique les principaux niveaux de son ontologie, qu’il analyse et fractionne ; médio-platonisme, dont le néoplatonisme hérite des topiques philosophiques ; aristotélisme, qui lègue une conception dynamique de l’âme et une hiérarchie des puissances cognitives consacrant la transcendance de l’intellect ; pythagorisme, qui permet à Jamblique de concevoir les mathématiques comme un langage valable pour la description de toutes les parties de la philosophie. Par l’ampleur de son œuvre ainsi que l’originalité et la fermeté des solutions apportées aux problèmes traités, Jamblique crée une synthèse puissante qui sert de base doctrinale aux écoles néoplatoniciennes tardives d’Athènes et Alexandrie, et est profondément représentative d’un âge théocentrique, où l’âme humaine n’est qu’un principe dérivé, qui doit prendre sa place dans l’ordre universel des choses : une métaphysique de l’unité, reposant sur la dualité dynamique de l’ordre et de sa variation
This thesis strives to provide modern research with a synthesis of the system of Iamblichus of Chalcis, an important figure in the development of later Greek metaphysics. It reconstructs in turn his psychology, his hierarchy of being and some of his most basic concepts and philosophical laws, with a stress on the continuity between Plotinus, founder of the Neoplatonic school, and the beginnings of the school of Athens. The whole of Iamblichus’ body of work is exploited, as well as the 800 fragments and testimonia on his life and doctrine handed down to us by later authors. Influences received are analysed and set in context: Plotinus’ and Porphyry’s Neoplatonism, which provides the general levels of reality which Iamblichus tried to analyse and enrich; Middle Platonism, whose topics are debated in Neoplatonism; Aristotelianism, which accounts for a dynamic conception of the human soul and a hierarchy of cognitive powers beginning with the transcendent Intellect; Pythagoreanism, which allows Iamblichus to depict mathematics as a universal language, able to take the mark of all parts of philosophy. By the scope of his work and the originality and neatness of the solutions he provided to problems which nascent Neoplatonism had to confront, Iamblichus is able to create a powerful synthesis which acts as a doctrinal basis for the later schools of Athens and Alexandria: it is profoundly representative of a theocentric era, in which human soul is but a derived principle that has to keep its place in the grand scheme of being. It is a metaphysics of unity, founded on the dual dynamic of order and variation
APA, Harvard, Vancouver, ISO, and other styles
2

Hannach, Gabriela. "Phenotypic plasticity in the red alga Porphyra abbottae : environmental factors influencing light harvesting ability /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/5210.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Li, Yang. "Geochronology and fluid evolution of the Qulong porphyry system : implications for porphyry deposit formation." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11869/.

Full text
Abstract:
Understanding the metal enrichment process and rate in porphyry Cu systems (PCS) is critical to underpin the genetic model of PCS and refine the template for exploration, of which robust temporal constrain is the key. In addition, fluid evolution paths constrained by bulk analysis potentially suffer problems of contamination. Based on detailed field geology and petrographic study, this PhD thesis addresses the timescales and fluid evolution process of the world class Qulong porphyry Cu-Mo deposit, Tibet, China, by applying high precision geochronology and high spatial resolution isotope analysis. A fluid inclusion study indicates that the bulk mineralization at Qulong was deposited between 425 and 280 oC under hydrostatic pressure conditions. The depth of formation of the Qulong porphyry Cu-Mo system is estimated at ~2.7 km, which implies ~2.3 km of erosion has occurred since its formation. Zircon CA-ID-TIMS U-Pb geochronology constrains the emplacement ages of the Rongmucuola pluton, the P porphyry and quartz aplite to 17.142 ± 0.014/0.014/0.023 (analytical/plus tracer/plus decay constant uncertainty), 16.009 ± 0.016/0.017/0.024 and 15.166 ± 0.010/0.011/0.020 Ma, respectively. Molybdenite ID-NTIMS Re-Os geochronology suggests that the bulk mineralization at Qulong was deposited through multiple shorted lived pulses (~ tens of kyrs) between 16.126 ± 0.008/0.060/0.077 and 15.860 ± 0.010/0.058/0.075 Ma, with a duration of 266 ± 13 kyrs. Quartz SIMS oxygen isotope analysis indicates a periodic interplay between meteoric and magmatic fluids and continuing increase of meteoric water from ~10 to ~25 % volume percent during the ore-forming process. As a result meteoric water is invoked as the main trigger for metal deposition at Qulong. The major conclusions of this study from Qulong are supported by numerical modelling, titanium diffusion and high precision studies, and have implications for understanding porphyry systems worldwide, for example, multiple and cyclic magmatic-hydrothermal fluid pulses cooled by meteoric water are fundamental for ore formation.
APA, Harvard, Vancouver, ISO, and other styles
4

Pizarro, Martínez Héctor Orlando. "Les traceurs minéralogiques comme indicateurs de porphyres cuprifères dans les remplissages sédimentaires des bassins adjacents, désert d'Atacama, Chili." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30105.

Full text
Abstract:
Les gisements de cuivre porphyrique (PCDs) sont liés au magmatisme calco-alkalins produit le long d'une marge tectonique convergente et résultent de la circulation de fluides hydrothermaux dérivés de magmas felsiques oxydés, hydratés et à faibles profondeurs. Au cours de l'évolution des systèmes magmatiques et hydrothermaux, les interactions fluide-roche génère des minéraux de l'altération hydrothermale typiques et peut également modifient ou génèrent des minéraux accessoires avec des signaux différents qui peuvent être associés à chaque étape de l'évolution du système, ce qui pourraient être distinguées par les caractéristiques physico et chimiques des minéraux accessoires hérités (zircon), des minéraux modifiés (apatites) ou des minéraux nouvellement formés (oxydes de Fe-Ti). Dans le désert d'Atacama, les bassins hydrographiques exposés le long de l'avant-arc occidental sont remplis de dépôts de gravier provenant de l'érosion de la Cordillère de Domeyko, en réponse à la phase tectonique éocene Incaique. On peut émettre l'hypothèse que certains de ces bassins contiennent des preuves minéralogiques qui qui vient de la dénudation des systèmes minéralisés en cuivre-porphyre situés en amont. L'objectif principal de cette thèse est donc de trouver des preuves magnétiques, minérales et chimiques qui permettront de relier la dénudation des PCDs aux sédiments déposés dans les bassins adjacents. Pour tester cette relation, nous comparons les caractéristiques magnétiques des roches et pétrographique et géochimique des minéraux accessoires (zircons et apatites) dans quatre PCDs situés dans la Cordillère de Domeyko (Chuquicamata, Mirador, Esperanza et Escondida), avec les mêmes caractéristiques des sédiments remplissant un bassin proche du district minier de Centinela. Dans ces PCDs, des caractéristiques pétrographique et géochimique distinctes des minéraux accessoires associées à la fertilité en cuivre ont été trouvés. Dans les zircons, la plus grande fertilité correspond aux signatures géochimiques : Hf > 8 750 (ppm), Eu / Eu* > 0,4, 10 000 x (Eu / Eu *) / Y> 1, (Ce / Nd) / Y> 0,01, Dy / Yb <0,3, Th / U < 1 -> 0,1), ce qui peut être lié à un état d'oxydation élevé et à une teneur élevée en eau magmatique dans le magma. Dans les apatites, les caractéristiques les plus distinctives de la fertilité en cuivre sont la couleur de luminescence verte, les valeurs élevées de Ca et la faible teneur en oligo-éléments, tels que Mg, Na, Cl, qui peuvent être liées à l'évolution des fluides hydrothermaux. Bien que le signal magnétique des PCDs soit contrôlé par la présence d'oxydes Fe-Ti d'origine hydrothermale et magmatique, il n'a pas été possible de différencier la contribution de ces deux composantes. Dans le bassin, il existe un dépôt de gravier (Tesoro) contenant un nombre important de zircons et d'apatites indicateurs de fertilité métallogénique des PCDs, qui coïncide avec une minéralisation de Cu exotique. On observe également une diminution des valeurs de susceptibilité magnétique des niveaux inférieurs aux niveaux supérieurs, qui est principalement contrôlée par la concentration en oxydes de Fe-Ti à grains grossiers d'origine détritique. La concentration la plus élevée en oxydes de fer pourrait être associée à un climat aride et à une influence tectonique, alors que la diminution de la concentration peut être liée à une tendance à l'aridification et / ou à un éloignement relatif des sources de ces oxydes. En conclusion, les apatites et les zircons détritiques des bassins ont le potentiel de documenter la dénudation des PCDs en amont. Par conséquent, l'utilisation de minéraux indicateurs représente une technique d'exploration potentiellement efficace qui peut facilement s'appliquer à la recherche de preuves concrètes de PCD contenues dans des dépôts de gravier. D'autre part, les propriétés magnétiques des sédiments nous renseignent sur les conditions paléo-climatiques et / ou tectoniques de leur dépôt
Porphyry copper deposits (PCDs) are linked to calk-alkaline magmatism produced in a convergent tectonic margin and resulted from the circulation of hydrothermal fluids derived from oxidized and water rich felsic magmas emplaced at shallow depths. During the evolution of the magmatic and hydrothermal systems, the fluid-rock interaction generates typical hydrothermal alteration minerals and can also modify or generates accessories minerals with different properties that can be associated at each stage of the evolution of the system, which could be distinguished by the physico and geochemical characteristics of the inherited accessory minerals (zircon), the modified minerals (apatite) or the newly formed minerals (Fe-Ti oxides). In the Atacama Desert hydrographic basins exposed along the western forearc are filled by gravel deposits which were derived from the erosion of the Domeyko Cordillera in response to the Eocene Incaic tectonic phase. It can be hypothesized that some of these basins contain mineralogical evidences that come from the denudation of porphyry copper mineralized systems located upstream. Therefore, the main goal of this thesis is to find magnetic, mineral and chemical evidences that will help to link the denudation of PCDs with sediments deposited in adjacent basins, mainly by using heavy minerals and magnetic signals as tracers contained in the sedimentary record. To test this relationship, I compare the rock-magnetic properties and physical and geochemical characteristics of minerals (zircon and apatite) in four selected DPCs located in Domeyko Cordillera (Chuquicamata, Mirador, Esperanza and Escodida), with the same characteristics in detrital sediment filling a close basin in the Centinela Mining District. In the studied PCDs, accessory minerals with distinctive physical and geochemical characteristics associated with metallogenic fertility were identified. In zircons, the most fertile samples correspond to these geochemical signatures: Hf > 8,750 (ppm), Eu/Eu* > 0.4, 10.000 x (Eu/Eu*)/Y > 1, (Ce/Nd)/ Y > 0.01, Dy/Yb < 0.3, Th/U < 1 - > 0.1), which can be linked to high oxidation state and high content of magmatic water in the magma. In apatite, the most relevant features indicating fertility are the green luminescence color and high Ca values and low content of trace elements, such as Mg, Na, Cl, which can be related to the evolution of hydrothermal fluids. Although the magnetic signal from DPCs is controlled by the presence of Fe-Ti oxides of hydrothermal and magmatic origin, their characteristics could not be used to differentiate the contribution of these two components. In the stratigraphic record there is a gravel deposit (Tesoro) which contains an important number of zircons and apatite which can be signaled as indicators of metallogenic fertility, that coincides with exotic-Cu mineralization and abundant clasts coming from different hydrothermal alteration zones related to PCDs. In the gravel deposits, a decrease in the magnetic susceptibility values from lower to upper levels is observed, which is mainly controlled by coarse-grain Fe-Ti oxides concentration of detritic origin. In the gravel deposits, rock magnetic properties are mainly controlled by Fe-Ti oxides concentration of detritic origin, where the highest concentration of Fe-minerals could be associated to arid climatic conditions and a rapid tectonically-controlled denudation, whereas the decline in concentration can be related to an aridification trend and/or sources changes
APA, Harvard, Vancouver, ISO, and other styles
5

Rappé, Charles J. "Porphyry and the Platonic-Aristotelian tradition." [S.l. : s.n.], 2002. http://www.freidok.uni-freiburg.de/volltexte/599.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

McFall, Katie Anne. "Critical metals in porphyry copper deposits." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/412122/.

Full text
Abstract:
Critical metals are elements essential to high-tech industry and green technology which are associated with a significant supply risk. Diversifying supplies of these elements is therefore a high priority. Porphyry copper deposits contain potentially economic enrichments of some of these elements, namely rhenium, platinum group elements (PGEs), bismuth and tellurium. This thesis investigates the source, transport mechanism and distribution of these critical elements in two post-collisional Tethyan porphyry deposits. The Muratdere Cu-Mo (Au-Re) porphyry deposit, Turkey, described here for the first time, contains two generations of molybdenite with contrasting Re concentrations. The early, Re-poor molybdenites have magmatic δ34SCDT values, while the late, vein hosted Re-rich molybdenite has δ34SCDT values matching those of the surrounding country rock suggesting that the additional Re has been sourced from hydrothermal fluid-country rock interaction. The Skouries Cu-Au porphyry deposit, Greece, is PGE, Te and Bi enriched. In contrast to Muratdere, Skouries is shown to be an orthomagmatic system hosted by a series of overprinting dykes, with the metal enrichment hypothesised to have been provided by periodic mafic recharge of a deeper source magma chamber. The mineralising fluids in Skouries are shown to have been highly oxidised and hypersaline with complex cation chemistry (Na, K, Fe, Mn and Ca), and with the overall fluid evolution progressing from an early CO2 rich fluid to a later brine. The PGEs in the deposit are located in the main hypogene mineralising veinsets, associated with potassic alteration, and are found to be hosted in bismuth and tellurium complexes. A variety of platinum group minerals are identified, including sopcheite (Ag4Pd3Te4) and sobolevskite (PdBi). LA-ICP-MS of fluid inclusions, combined with microthermometry, has shown gold, bismuth and palladium to be hydrothermally transported by high temperature ( > 500°C), high salinity ( > 65 wt% NaCl+KCl) and highly oxidised fluids, and a bismuth-tellurium collector model is proposed to allow concentration of palladium from under-saturated fluids into platinum group minerals. High semi-metal (Te and Bi) contents in porphyries are therefore proposed to be an indicator of PGE enrichment.
APA, Harvard, Vancouver, ISO, and other styles
7

Valencia, Victor A. "EVOLUTION OF LA CARIDAD PORPHYRY COPPER DEPOSIT, SONORA AND GEOCHRONOLOGY OF PORPHYRY COPPER DEPOSITS IN NORTHWEST MEXICO." Diss., Tucson, Arizona : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1085%5F1%5Fm.pdf&type=application/pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

André-Mayer, Anne-Sylvie. "Fluides et fracturations dans les gisements de type porphyre et épithermal." Nancy 1, 2000. http://www.theses.fr/2000NAN10176.

Full text
Abstract:
En métallogénie, il est admis depuis longtemps que les fluides sont les principaux vecteurs des métaux et que fluides et déformations sont étroitement associés dans le déroulement des processus minéralisateurs. Ce travail aborde ces deux principaux aspects en environnement porphyre et épithermal où de nombreuses inconnues subsistent en ce qui concerne les processus minéralisateurs, l'origine dès fluides minéralisateurs ainsi que le rôle joué par les drains de cas fluides à savoir les fractures. L'étude des fluides réalisée dans le district épithermal de Shila (SW Pérou) a permis de proposer un modèle de minéralisation pour l'ensemble des gisements du district. Les différences observées dans la nature des fluides et dans leurs propriétés PVT semblent expliquer les différents types et· styles de minéralisation. A Apacheta, l'étude de l'évolution verticale des paramètres physico-chimiques des fluides en parallèle de la minéralisation montre que la différence de minéralisation observée entre les niveaux profonds (Pb-Zn) et plus superficiels (Au-Ag) est lié à un fractionnement des gaz présents dans les fluides lors d'un phénomène d'ébullition. L'étude de la géochimie des fluides (crush-leach) associés à ce type de minéralisation dans différents districts (Shila, Pérou; Baia Mare et Monts Apuseni, Roumanie, Pongkor, Indonésie) montre que ces fluides présentent des chimies comparables quel que soit leur contexte géodynamique. Ces compositions sont également similaires aux fluides associés aux systèmes géothermiques. Des analyses des propriétés de réseaux de fractures ont été réalisé à échelle macroscopique sur des systèmes de veines qu'elle soient minéralisées ou non. Elles ont permis dans un premier temps d'établir une nouvelle méthode pour caractériser des paléocontraintes en tenant compte de l'influence de la présence de fluides. Appliquée sur le réseau de veines de Soultz-sous-Forêts, cette méthode donne des valeurs réalistes de paléocontraintes à l'origine de la réouverture d'un système de veines en présence de fluides. Différentes techniques d'études géométriques et statistiques permettant la caractérisation des propriétés d'un réseau de fractures ont également été appliquées sur le stockwerk minéralisé du porphyre cuprifère de Rosia Poienî (Roumanie). Les hétérogénéités constatées dans les caractéristiques du stockwerk (à l'échelle métrique) semblent se traduire directement pas des variations dans les teneurs en cuivre. La description statistique des propriétés du stockwerk minéralisé semble être un outil prospectif très intéressant. La caractérisation des propriétés hydrauliques des veines constitutives du stockwerk met également en évidence des hétérogénéités à l'échelle de la carrière. Les niveaux les plus profonds et les plus minéralisés sont dominés par des perméabilité de drains et une organisation de veines en clusters. Les niveaux les plus superficiels développent quant à eux de faible perméabilité de fissures, sans drains majeurs entraînant de ce fait une perméabilité pervasive dans la masse
In metallogeny, it is now obvious that fluids are the main vectors of metals and that fluids and deformations are closely associated in the mineralizing processes. This work deals about this two main aspects in the porphyry and epithermal environment. Fluid studies, realised in the epithermal district of Shila (SW Peru), allow to state a mineralizing model at the district scale. The differences observed in the PVT properties of the fluids seem to explain the different types and styles of mineralization. At Apacheta, studies of the vertical evolution of the physico-chemical parameters of the fluids in parallel to the mineralization show that differences, observed between deep levels (Pb-Zn) and shallower levels (AuAg), is directly linked to a fractionation of gases present in fluids during a boiling event. The geochemistry (crush-leach) of the fluids associated to this type of mineralization in various districts (Shila, Pero; Baia Mare and Apuseni Moutains, Romania; Pongkor, Indonesia) are similar whatever their geodynamic context and are comparable with the fluids associated to geothermal systems. Analyses of fracture networks has been realised at macroscopic scale on different (mineralized or not) vein systems. They allow in a first time to establish a new methodology to characterize paleostresses taking into account the influence of the fluid pressure. Applied on the Soultz-sous-Forêts vein system, this method gives realistic paleostress magnitudes linked to the reopening of quartz veins. The mineralized stockwerk of the Rosia Poieni porphyry copper (Apuseni Mts, Romania) has been chosen for a statistical and hydraulic characterization in order to understand how mineralized vein system evolve and grow. A 1D sampling of the stockwerk has been realized on 2000 fractures distributed on five levels of the open pit (910, 940, 1000, 1045 and 1060 ml. Various statistical analyses has been applied and heterogeneities observed in the stockwerk (metric scale) express directly variations in the copper content. Statistical description of the stockwerk properties seems thus to be a very powerful prospective tool. Estimation of hydraulic conductivities developed by veins has been realized and show equally heterogeneities at the quarry scale. The mean permeability developed by all the veins on each profile decrease from the deeper and more mineralized level (910m) to the highest level (1060m). High permeabilities developed on the 910 m profile are linked to the presence of major drains and the clustered organization of veins. The level 1060 m, characterized by numerous and thin veins with a homogeneous spatial repartition, develop a more pervasive permeability
APA, Harvard, Vancouver, ISO, and other styles
9

Geißler, Marion, Anja Hartmann, Wolfram Heidenfelder, and Tim Witzke. "Geotope - Einblicke in die Erdgeschichte." Geopark Porphyrland. Steinreich in Sachsen e.V, 2019. https://slub.qucosa.de/id/qucosa%3A36070.

Full text
Abstract:
Naturschutz ist inzwischen tief in unserem Denken und Handeln angekommen. Aber noch immer wird dabei zu allererst an den Schutz von Tieren und Pflanzen gedacht, gefolgt vom Schutz des oberirdischen und unterirdischen Wassers. Das ist verständlich, hat doch diese Art des Naturschutzes lange zurückliegende Wurzeln.
APA, Harvard, Vancouver, ISO, and other styles
10

Dickinson, Jenni Michelle. "Jura-triassic magmatism and porphyry Au-Cu mineralization at the Pine Deposit, Toodoggone District, North-central British Columbia." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/3959.

Full text
Abstract:
The Pine, Fin, and Mex porphyry Au-Cu ± Mo systems are all located within a 10 km² area in the Toodoggone district, along the eastern margin of the Stikine terrane in British Columbia. Multiple episodes of porphyry-style mineralization are associated with these three magmatic centres. The Fin monzogranite is the oldest dated pluton in the district, with a U-Pb zircon emplacement age of 217.8 ± 0.6 Ma. A cross-cutting main-stage quartz-pyrite-chalcopyrite ± molybdenite ± sphalerite vein gives an older Re-Os molybdenite mineralization age of 221.0 ± 1.4 Ma. Hence the vein probably cross-cuts a slightly older, undated magmatic phase. Lead isotope values for sulphide minerals from main-stage veins indicate that magmatic-derived fluids interacted with country rocks and possibly other fluids. The Pine quartz monzonite (U-Pb zircon emplacement age of 197.6 ± 0.5 Ma) intrudes, alters, and locally mineralizes Toodoggone Formation Duncan Member andesite tuff (U-Pb zircon age of 200.9 ± 0.4 Ma). High-grade (0.57 g/t Au and 0.15% Cu) mineralization occurs in main-stage quartz-magnetite chalcopyrite-pyrite veins and disseminated throughout the potassic alteration zone in the Pine quartz monzonite stock. Late-stage anhydrite-pyrite ± specular hematite ± chalcopyrite, quartz-pyrite ± chalcopyrite, and pyrite ± chalcopyrite veins and related phyllic alteration cross-cut earlier veins. Propylitic alteration occurs distal to the potassic core of Pine in the Fin monzogranite and Duncan Member andesite. Limited fluid inclusion data, in combination with S and Pb isotope values for veins and host rocks, suggest that the main-stage fluid was magmatic-derived and deposited metals at 430 to 550 °C and depths of about 5.5 km. Late-stage fluids were also probably derived from the Pine quartz monzonite but interacted with Takla Group country rock prior to metal deposition. Metals were deposited at temperatures of 330 to 430 °C and depths of about 5.0 to 5.5 km. The final mineralization phase of the Pine porphyry system is temporally constrained by the emplacement of weakly mineralized syenite dykes (U-Pb zircon age of 193.8 ± 0.5 Ma). The final stage of magmatism in the Pine-Fin-Mex area is defined by the emplacement of rhyolite dykes (U-Pb zircon age of 193.6±0.4 Ma).
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Porphir"

1

Porphyry: Red imperial porphyry : power and religion. Torino: U. Allemandi & C., 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Porphyry. Porphyry Introduction. Oxford: Oxford University Press, 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Vogel, Alois. Der Wald aus Porphyr: Ein Lesebuch. Wrocław: Oficyna Wydawnicza ATUT, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Chrysafis, Andreas C. Porphyra in Purple. UK: Evandia Publishing (UK)Ltd, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Porphyra gelia: Mythistorēma. Athēna: Ekdoseis Patakē, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Porphyry. Select works of Porphyry. Frome, Somerset, UK: Prometheus Trust, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Lazaropoulos, Panagiōtēs D. Hē porphyra tou deilinou. Athēna: Ekdoseis Parousia, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hadot, Pierre. Plotin, Porphyre: Études néoplatoniciennes. Paris: Belles lettres, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Berchman, Robert M. Porphyry against the Christians. Leiden: Brill, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ahmad, Mahmood U. Porphyry copper in Pakistan. Quetta: Geological Survey of Pakistan, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Porphir"

1

Misra, Kula C. "Porphyry Deposits." In Understanding Mineral Deposits, 353–413. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-3925-0_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Knuuttila, Simo, David Piché, Pieter De Leemans, Stephen F. Brown, Fabrizio Amerini, Ian Wilks, Christopher Schabel, et al. "Porphyry, Arabic." In Encyclopedia of Medieval Philosophy, 1056–62. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9729-4_413.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bonadeo, Cecilia Martini, Angela Guidi, Antonella Straface, Roxanne D. Marcotte, Cecilia Martini Bonadeo, Samuel Noble, Emily J. Cottrell, et al. "Arabic Porphyry." In Encyclopedia of Medieval Philosophy, 88. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9729-4_44.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

D’Ancona, Cristina. "Porphyry, Arabic." In Encyclopedia of Medieval Philosophy, 1576–84. Dordrecht: Springer Netherlands, 2020. http://dx.doi.org/10.1007/978-94-024-1665-7_413.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Bährle-Rapp, Marina. "Porphyra Umbilicalis Extract." In Springer Lexikon Kosmetik und Körperpflege, 442. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_8242.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Li, Nuo, YongFei Yang, LaiMin Zhu, Jing Li, Franco Pirajno, and YanJing Chen. "Porphyry Mo Deposits." In Modern Approaches in Solid Earth Sciences, 159–361. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4871-7_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Levine, I. A., and D. Cheney. "North American Porphyra Cultivation." In New Developments in Marine Biotechnology, 141–44. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-5983-9_30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Pirajno, Franco. "Porphyry Systems and Skarns." In Hydrothermal Mineral Deposits, 325–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-75671-9_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Yang, YongFei, Yan Yang, Guang Wu, Jing Li, and YanJing Chen. "Porphyry–Skarn Mo Systems." In Modern Approaches in Solid Earth Sciences, 363–516. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4871-7_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

"Porphyry." In Dictionary of Geotourism, 483. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2538-0_1929.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Porphir"

1

Maeda, Masayuki, and Kazuaki Sakoda. "Photochemical Hole Burning of Porphin-Cross-Linked Polymers." In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.wd39.

Full text
Abstract:
It is well known that porphin derivatives such as tetraphenylporphin (TPP) molecularly dispersed in organic polymers such as polymethylmethacrylate (PMMA) exhibit photochemical hole burning (PHB). In this kind of porphin/polymer system of simple dispersion type, large irreversible broadening of photochemical holes is observed even at extremely low temperatures around liquid helium temperature [1]. This broadening, or spectral diffusion, is caused by the energy shift of the electronic states of the porphin molecule brought about by the structural changes which take place in the organic amorphous polymer. The reduction of this spectral diffusion is one of the main subjects for the possible application of PHB to high-density optical memory. In the previous paper [1], we reported on the spectral diffusion in the copolymer of methylmethacrylate (MMA) and TPP derivative with four functional groups and showed that the spectral diffusion is suppressed by the covalent bonds formed between TPP and the host polymer. Besides, we reported that the hydrogen bonds formed in the host polymer also suppress the spectral diffusion, which was confirmed for the several porphin derivatives with ionic substituents dispersed in polyvinylalcohol (PVA), one of the most efficient hydrogen bonding polymers [2]. Then, we may expect still less spectral diffusion in such materials that have both the covalent bonds between TPP and the host polymer, and the hydrogen bonds in the latter. In this study, we will show that this anticipation is true.
APA, Harvard, Vancouver, ISO, and other styles
2

Vacha, Martin, Shinjiro Machida, and Kazuyuki Horie. "Photochemical Hole Burning in the Soret Absorption Band of Zinc-tetrabenzoporphin Derivative by Two-photon Excitation." In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.thf2.

Full text
Abstract:
Line-narrowing spectroscopic techniques, such as site-selection spectroscopy (fluorescence line narrowing) and spectral hole burning, have, to our knowledge, so far failed to eliminate the effect of inhomogeneous broadening of optical transitions to the second and/or higher excited singlet electronic states (Soret absorption band) of porphin-type dyes in low temperature matrices, mainly due to: (1) Perturbations between different electronic states and resulting broadening of the homogeneous spectral bands [1], and (2) Increasing density of vibronic states with increasing transition energy and lack of correlation between individual states of different molecules. However, in a class of porphin derivatives - free-base and metallotetrabenzoporhines (TBP) - the former effects are substantially reduced. As a result, quasiline structure of S0-S2 transitions of ZnTBP in an Ar matrix [2], and later of ZnTBP in supersonic expansions [3] were observed. Further, fluorescence from S2 state of ZnTBP [2,4] and recently also of Zn-tetratolyl-TBP [5] and Zn-TPP [6] were reported.
APA, Harvard, Vancouver, ISO, and other styles
3

Williams, David F. "Imperial Porphyry in Roman Britain." In XI International Conference of ASMOSIA. University of Split, Arts Academy in Split; University of Split, Faculty of Civil Engineering, Architecture and Geodesy, 2018. http://dx.doi.org/10.31534/xi.asmosia.2015/02.28.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Starukhin, A., M. Kruk, and R. Czerwieniec. "Phosphorescence study of matrix effect on Pd-porphin macrocycle conformation." In The International Conference on Coherent and Nonlinear Optics, edited by Sergey A. Tikhomirov, Thomas Udem, Valery Yudin, Maxim Pshenichnikov, and Oleg M. Sarkisov. SPIE, 2007. http://dx.doi.org/10.1117/12.752499.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Kruk, M., and A. Starukhin. "Molecular thermometer for cryogenic range based on Pd-porphin phosphorescence." In International Conference on Lasers, Applications, and Technologies '07, edited by Gennadii Matvienko, Arkadii Ivanov, Petr Nikitin, Eugene Voropay, Mikhail Khodasevich, Vladislav Panchenko, and Vladimir Golubev. SPIE, 2007. http://dx.doi.org/10.1117/12.753354.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sakoda, K., K. Kominami, and M. Iwamoto. "Photochemical Hole Burning of Ionic Dye Molecules." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.mgg5.

Full text
Abstract:
We previously reported the first observation of a photochemical hole burned above 77 K.1 In this paper, the hole burning characteristics of several related dye doped polymers were investigated. The samples we studied were (A) porphin derivatives with ionic substituents such as sulfothienyl groups and (B) two fluorescein derivatives, both dispersed in polyvinyl alcohol. The following results were obtained: (1) The hole width in the former shows a power law dependence on the burning temperature between 20 and 120 K, and the value of the power is 1.7-1.8. (2) The energy difference between the zero phonon hole and the side hole is fairly large in the former, which brings about a weak temperature dependence of the Debye-Waller factor. (3) Persistent spectral holes can be burned in the latter, which is reported for the first time. (4) The mechanism of the hole burning in the latter does not involve the intramolecular charge transfer proposed for similar organic dye molecules such as resorufin.2
APA, Harvard, Vancouver, ISO, and other styles
7

Gaynor, Sean, and Allen F. Glazner. "DID THE JOHNSON GRANITE PORPHYRY ERUPT?" In 112th Annual GSA Cordilleran Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016cd-274578.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Cloos, Mark, and Stephanie Wafforn. "SUBDUCTION ZONES AND PORPHYRY COPPER DEPOSITS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-285869.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Keith, Stanley B., and Jan Rasmussen. "SUBDUCTION OF ARIZONA PORPHYRY COPPER DEPOSITS." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340195.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Woody, Kelsey, Sean Gaynor, Joshua M. Rosera, and D. S. Coleman. "LEAD AWAY FROM THE PORPHYRY: UNDERSTANDING THE SOURCE OF HYDROTHERMAL MINERALS IN THE QUESTA PORPHYRY MO DEPOSIT." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-336192.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Porphir"

1

Beckett-Brown, C. E., A. M. McDonald, and M. B. McClenaghan. Discovering a porphyry deposit using tourmaline: a case study from Yukon. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331349.

Full text
Abstract:
As the exploration for porphyry Cu-Au-Mo deposits has become increasingly challenging, the development of more effective techniques directed at detecting buried deposits has become critical. One methodology is to focus on key minerals, one of which is tourmaline, a robust, ubiquitous mineral in most mineralized porphyry systems. Overall, a combination of physical and chemical characteristics including 1) macro-color, 2) morphology, 3) inclusion populations, and 4) trace-element compositions are useful in discriminating between porphyry- versus non-porphyry-derived (or related) tourmaline in surficial sediments (Beckett-Brown 2022). These features are applied to tourmaline obtained from stream sediment samples (n = 22) from 16 streams derived from the unglaciated terrain proximal to the Casino calc-alkaline porphyry Cu-Au-Mo deposit (Yukon Territory, Canada). The obtained tourmaline occurs as two distinct morphologies: 1) individual blocky to prismatic sub- to euhedral grains (Type 1), 2) aggregates of radiating prismatic to acicular sub- to euhedral grains (Type 2). Type 1 grains display trace-element contents that reflect mixed origins including a mineralized porphyry origin as well metamorphic and pegmatitic (background) environments. Type 2 grains almost exclusively exhibit porphyry-derived trace-element chemistries (i.e., high Sr/Pb ~150 avg. and relatively low Zn/Cu ~2.5 avg. values). In Canadian Creek, that directly drains from the Casino deposit, samples closest to the deposit contain &amp;gt;70% porphyry-derived tourmaline, while other streams in the region from unprospective drainage basins contain no porphyry-derived tourmaline. At the most distal sample site in Canadian Creek, ~20 km downstream from Casino, nearly 30% of the recovered tourmaline in the stream sediments is porphyry-related. This method has potential to be a strong indicator of prospectivity and applicable for exploration for porphyry Cu-Au-Mo systems in both unglaciated and glaciated terrains.
APA, Harvard, Vancouver, ISO, and other styles
2

Kirkham, R. V., and K. P. E. Dunne. World porphyry and porphyry-related deposit database. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/297319.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Chapman, J. B., A. Plouffe, S. E. Jackson, J. J. Ryan, and T. Ferbey. Mineral markers of porphyry processes: regional and local signatures of porphyry prospectivity. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296487.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Kirkham, R. V., and K. P. E. Dunne. World distribution of porphyry, porphyry-associated skarn, and bulk-tonnage epithermal deposits and occurrences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211229.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Kirkham, R. V., and K. P. E. Dunne. World distribution of porphyry, porphyry-associated skarn, and bulk-tonnage epithermal deposits and occurrences. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211230.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Israel, Alvaro, and John Merrill. Production of Seed Stocks for Sustainable Tank Cultivation of the Red Edible Seaweed Porphyra. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7696527.bard.

Full text
Abstract:
Porphyra species (commonly known as ‘nori’ or ‘purple laver’) are edible red seaweeds rich in proteins, vitamins and other highly valued biogenic compounds. For years Porphyra has been cultured using seeded nets extended in the open sea, and its biomass consumed primarily in the Far East. While demands for international markets have increased steadily at an average of 20% per year, supplies are on the verge and not expected to meet future demands. Alternatively, land-based cultivation of seaweed has become attractive in the mariculture industry since (1) important growth parameters can be controlled, (2) is environmentally friendly and (3) perfectly matches with integrated aquaculture leading to sustainable, high quality products. During the last few years a tank cultivation technology for Porphyra has been developed at the Israeli institution. This technology is based on indoor production of asexual spores and their subsequent growth to 1-2 mm seedlings. The seedlings are then transferred to outdoor tanks and ponds when seawater temperatures drop to 20 °C, or below, and days become shorter during winter time. However, the current technology efficiently serves only about 100 m2 of ponds during one growth season. In order to produce seedlings in sufficient amounts, it is critical to address both technical and biological aspects of seedling production, securing optimal up-scale to commercial-size cultivation farms. We hypothesize that massive production of spores is related to thalli origin, thalli age and sporulation triggers, and that seedling survival and their subsequent growth potential is determined by the seawater quality and overall indoor growth conditions imposed. A series of bio-reactors were constructed and tested in which spore release and spore growth were separately studied. The main assessment criteria for optimal viability of the seedlings will be by determining their electron transport rate using PAM fluorometry and by subsequent growth and biomass yields in outdoor ponds. Altogether the project showed (1), controlled sporulation is possible in big outdoor/growth chamber settings provided initial stock material (small frozen seedlings) is at hand, (2), contamination problems can be almost completely avoided if stock material is properly handled (clean as possible and partially dehydrated prior to freezing), (3), spore release can significantly be enhance using high nutrient levels during thawing for P. yezoensis and P. haitanensis, but not for P. rosengurttii, (4), PAM fluorometry is an efficient tool to estimate growth capacity in both seedlings and juvenile thalli. The BARD funding also served to explore other aspects of Porphyra biology and cultivation. For example, the taxonomical status of Porphyra strains used in this study was defined (see appendix), and the potential use of this seaweed in bioremediation was well substantiated. In addition, BARD funding supported a number of opportunities and activities in the Israeli lab, direct or indirectly related to the initial objectives of the project such as: additional molecular work in other seaweeds, description of at least 2 new species for the Israeli Mediterranean, and continuous support for the writing of a book on Global Change and applied aspects of seaweeds. The technology for Porphyra cultivation in land-based ponds is readily available. This study corroborated previous know-how of Porphyra growth in tanks and ponds, and yet offers important improvements regarding seedling production and their handling for successful cultivation. This study supported various other activities opening additional important issues in the biology/cultivation/use of Porphyra and other seaweeds.
APA, Harvard, Vancouver, ISO, and other styles
7

Kirkham, R. V., and W. D. Sinclair. Porphyry copper, gold, molybdenum, tungsten, tin, silver. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/208014.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

McClenaghan, M. B., M W McCurdy, R G Garrett, C. E. Beckett-Brown, M. I. Leybourne, S. G. Casselman, and P. Pelchat. Heavy mineral and geochemical signatures of porphyry copper mineralization: examples from the Casino porphyry Cu-Au-Mo deposit, Yukon. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/327987.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Rogers, N., A. Plouffe, J. B. Chapman, M. B. McClenaghan, D. A. Kellett, and R. A. Anderson. Identifying new vectors to hidden porphyry-style mineralisation. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296471.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

McClenaghan, M. B., M. W. McCurdy, R. G. Garrett, C. E. Beckett-Brown, M. I. Leybourne, S. G. Casselman, and P. Pelchat. Mineral and geochemical signatures of porphyry copper mineralization: work in progress for the Casino Cu-Au-Mo-Ag porphyry deposit, Yukon. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/313667.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Porphir' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography