Conecte-se

Bibliografias temáticas / U-Pb zircon geochronology / Teses / dissertações

Siga este link para ver outros tipos de publicações sobre o tema: U-Pb zircon geochronology.

Teses / dissertações sobre o tema "U-Pb zircon geochronology"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 31 de janeiro de 2023

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos

Selecione um tipo de fonte:

Veja os 50 melhores trabalhos (teses / dissertações) para estudos sobre o assunto "U-Pb zircon geochronology".

Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.

Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.

Veja as teses / dissertações das mais diversas áreas científicas e compile uma bibliografia correta.

1

Neace, Erika R. "Zircon LA-ICPMS Geochronology of the Cornubian Batholith, SW England." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1448912006.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

2

Pepper, Martin Bailey. "Magmatic History and Crustal Genesis of South America: Constraints from U-Pb Ages and Hf Isotopes of Detrital Zircons in Modern Rivers." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/347220.

Texto completo da fonte

Resumo:

South America provides an outstanding laboratory for studies of magmatism and crustal evolution because it contains older Archean-Paleoproterozoic cratons that amalgamated during Mesoproterozoic and Neoproterozoic supercontinent assembly, as well as a long history of Andean magmatism that records crustal growth and reworking in an accretionary orogen. We have attempted to reconstruct the growth and evolution of South America through U-Pb geochronology and Hf isotope analyses of detrital zircons from 59 samples of sand from modern rivers and shorelines. Results from 5,524 new U-Pb ages and 1,19

Estilos ABNT, Harvard, Vancouver, APA, etc.

3

Sorota, Kristin Joy. "Age and Origin of the Merrimack Terrane, Southeastern New England: A Detrital Zircon U-Pb Geochronology Study." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3043.

Texto completo da fonte

Resumo:

Thesis advisor: J C. Hepburn<br>Thesis advisor: Yvette D. Kuiper<br>Metasedimentary rocks of the Merrimack terrane (MT) originated as a thick cover sequence on Ganderia consisting of sandstones, calcareous sandstones, pelitic rocks and turbidites. In order to investigate the age, provenance and stratigraphic order of these rocks and correlations with adjoining terranes, detrital zircon suites from 7 formations across the MT along a NNE-trending transect from east-central Massachusetts to SE New Hampshire were analyzed by U-Pb LA-ICP-MS methods on 90-140 grains per sample. The youngest detrital

Estilos ABNT, Harvard, Vancouver, APA, etc.

4

Asmussen, Pascal. "Insights from the Devonian Adavale Basin on the tectonic history of the Thomson Orogen." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/200906/1/Pascal_Asmussen_Thesis.pdf.

Texto completo da fonte

Resumo:

This research aims to advance our understanding of the expansion of the Australian continent during the Palaeozoic. Geological remnants of specific sedimentary basins in southwest Queensland and north-western NSW were used as focus sites. A novel multi-method approach used sediment compositional information and Uranium-Lead mineral dating in combination with novel statistical methods to constrain the relative timing, sediment pathways and connectivity of these basins. The research showed that although a major period of stabilisation of the Australian continent had occurred by the beginning of

Estilos ABNT, Harvard, Vancouver, APA, etc.

5

Laurent, Antonin. "Etude pétrologique et chronométrique (U-Th-Pb) de la monazite et du zircon dans les granulites de ultra-haute température du Rogaland, Norvège." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30290/document.

Texto completo da fonte

Resumo:

La compréhension des processus orogéniques nécessite un couplage toujours plus étroit entre données pétrologiques visant à contraindre le trajet pression-température des roches et les données géochronologiques donnant accès aux âges et durées absolues. Cette thèse vise en premier lieu à étudier le comportement des monazites et des zircons, utilisés en géochronométrie U-Th-Pb dans les granulites de ultra-haute température (UHT) du Rogaland (sud de la Norvège). Nous montrons que la datation ponctuelle in-situ U-Th-Pb, combinée à l'analyse des éléments majeurs et traces contenus dans la monazite

Estilos ABNT, Harvard, Vancouver, APA, etc.

6

Quinn, Ryan Joel. "THE EVOLUTION OF GRENVILLE BASEMENT IN THE EASTERN GREAT SMOKY MOUNTAINS; CONSTRAINTS FROM U-PB ZIRCON GEOCHRONOLOGY, WHOLE ROCK SM-ND, AND FELDSPAR PB GEOCHEMISTRY." UKnowledge, 2012. http://uknowledge.uky.edu/ees_etds/7.

Texto completo da fonte

Resumo:

Identifying the crustal affinity of Grenville basement rocks in the Dellwood quadrangle, western NC, provides insight into the tectonic evolution of eastern Laurentia during Grenville orogenesis. U-Pb zircon geochronology of orthogneiss, augen gneiss, and mafic xenoliths in orthogneiss reveal magmatic pulses at 1130, 1180, and 1330 Ma and metamorphic episodes at 450 and 1040 Ma. Xenoliths in 1330 Ma orthogneiss are as old as 1382 Ma and represent the oldest component of Blue Ridge basement identified to-date. Feldspar Pb isotope values span a range between juvenile-Laurentian and southern-cent

Estilos ABNT, Harvard, Vancouver, APA, etc.

7

Nasdala, Lutz, Fernando Corfu, John W. Valley, et al. "Zircon M127 - A Homogeneous Reference Material for SIMS U-Pb Geochronology Combined with Hafnium, Oxygen and, Potentially, Lithium Isotope Analysis." WILEY-BLACKWELL, 2016. http://hdl.handle.net/10150/621937.

Texto completo da fonte

Resumo:

In this article, we document a detailed analytical characterisation of zircon M127, a homogeneous 12.7 carat gemstone from Ratnapura, Sri Lanka. Zircon M127 has TIMS-determined mean U-Pb radiogenic isotopic ratios of 0.084743 +/- 0.000027 for Pb-206/U-238 and 0.67676 +/- 0.00023 for Pb-207/U-235 (weighted means, 2s uncertainties). Its Pb-206/U-238 age of 524.36 +/- 0.16 Ma (95% confidence uncertainty) is concordant within the uncertainties of decay constants. The delta O-18 value (determined by laser fluorination) is 8.26 +/- 0.06 parts per thousand VSMOW (2s), and the mean Hf-176/Hf-177 ratio

Estilos ABNT, Harvard, Vancouver, APA, etc.

8

Ng, Wai Pan. "Petrogenesis, U-Pb zircon geochronology and tectonic evolution of the Malaysian granite provinces in the Southeast Asian tin belt." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:0f2f3942-6d64-4a17-b194-08672107aeb2.

Texto completo da fonte

Resumo:

The Malaysian granitoids form the backbone of the Malay Peninsula and have long been recognized as composed of two distinct granitic provinces separated by the Bentong-Raub suture zone: <table><ol><li>Early Permian to Late Triassic Eastern Province (Indochina – East Malaya) with mainly “I-type” hornblende-bearing granitoids, associated with Cu-Au deposits, and subordinate hornblende-free pluton roof-zones hosting limited Sn-W deposits; and</li> <li>Late Triassic Main Range Province, western Malaysia (Sibumasu) with mainly “S-type” hornblende-free granitoids, associated with Sn-W deposits, and

Estilos ABNT, Harvard, Vancouver, APA, etc.

9

Loughry, Donald Franklin Jr. "ORIGIN OF BLUE RIDGE BASEMENT ROCKS, DELLWOOD QUAD, WESTERN NC: NEW EVIDENCE FROM U-PB ZIRCON GEOCHRONOLOGY AND WHOLE ROCK GEOCHEMISTRY." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/11.

Texto completo da fonte

Resumo:

Terrane discrimination in polycyclic continental basement rocks is challenging due to high-grade metamorphism and intense deformation. Based on early USGS mapping the Blue Ridge basement in the Dellwood quadrangle of the eastern Great Smoky Mountains was proposed to consist of augen orthogneisses of Laurentian (Grenvillian) affinity interfolded with migmatitic hornblende and biotite paragneisses (“Carolina Gneiss”) and amphibolites of uncertain affinity. However, detailed study reveals that the hornblende gneiss of Hadley and Goldsmith (1963) is a heterogeneous map unit consisting of (1)metapl

Estilos ABNT, Harvard, Vancouver, APA, etc.

10

Ames, Carsyn Jean. "Insights for provenance analysis of modern watersheds from detrital apatite and detrital zircon U-PB geochronology- Talkeetna Mountains, southcentral Alaska." Thesis, University of Iowa, 2018. https://ir.uiowa.edu/etd/3244.

Texto completo da fonte

Resumo:

Detrital zircon U-Pb geochronology is a useful tool for analyzing provenance in the sedimentary record. Differentiating recycled and first cycle populations in the detrital record, however, is not a straightforward process. A second potential problem in using detrital signatures to determine provenance of sediment lies in the assumption that detrital signatures of modern rivers reflect input from each exposed unit in the catchment boundaries. To investigate each of these problems, I present U-Pb analysis of detrital zircon (DZ) from modern river sand collected from 20 watersheds, 6 detrital ap

Estilos ABNT, Harvard, Vancouver, APA, etc.

11

Albardeiro, Luís José de Sousa. "Aplicação da geocronologia U-Pb em zircão a areias e rochas do substrato do litoral do sudoeste de Portugal: implicações para a proveniência, dinâmica sedimentar e história geológica da região." Doctoral thesis, Universidade de Évora, 2015. http://hdl.handle.net/10174/18275.

Texto completo da fonte

Resumo:

O presente estudo de proveniência sedimentar baseia-se na geocronologia U-Pb em zircão da areia de praia (Areias Brancas, Aberta Nova e São Torpes) e, das rochas que constituem as arribas adjacentes, junto ao Cabo de Sines (grauvaques do Grupo do Flysch do Baixo Alentejo, areias da Bacia de Alvalade e sienitos do Maciço de Sines). As populações de zircão detrítico dos grauvaques carbónicos amostrados neste estudo distribuem-se principalmente pelo Neoproterozoico (ca. 844-548 Ma), derivando de fontes localizadas no bloco continental de Gondwana (Zona de Ossa-Morena). O restante flysch inclui ou

Estilos ABNT, Harvard, Vancouver, APA, etc.

12

Sakata, Shuhei. "Development of analytical technique for precise age determination of Quaternary zircons with the correction of the initial disequilibrium on U-Th-Pb decay series using a laser ablation-ICP-mass spectrometry." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199112.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

13

Reid, Mattie Morgan. "Forearc basin detrital zircon provenance of Mesozoic terrane accretion and translation, Talkeetna Mountains-Matanuska Valley, south-central Alaska." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5611.

Texto completo da fonte

Resumo:

The Wrangellia composite terrane is one of the largest fragments of juvenile crust added to the North American continent since Mesozoic time, and refining its accretionary history has important implications for understanding how continents grow. New U-Pb geochronology and Hf isotopes of detrital zircons from Late Jurassic-Late Cretaceous strata from the forearc of the Wrangellia composite terrane allows more insight on the tectonic and paleogeographic history of the terrane. Our stratigraphically oldest samples from the Late Jurassic Naknek Formation have a detrital zircon U-Pb signature domin

Estilos ABNT, Harvard, Vancouver, APA, etc.

14

Borgo, Ariadne. "Le gisement d’or du Tocantinzinho (province aurifère du Tapajós) relations entre déformation, hydrothermalisme et minéralisation." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT078/document.

Texto completo da fonte

Resumo:

Le gisement de Tocantinzinho est situé sur la province aurifère de Tapajós et est le plus grand gisement d'or de la province, avec 53,9 tonnes d'or estimées. Sa formation commence par un magmatisme granodioritique autour de 2005 Ma, suivi d'un magmatisme granitique. Le granite Tocantinzinho est composé de deux faciès principaux (syenogranite - 1996± 2Ma; monzogranite 1989±1 Ma), des corps d’aplite et de pegmatite, qui suggère un magmatisme enrichie en fluide et mis en place à faible profondeur. Intrusifs dans ces roches, des dykes d'andésite (1998±8Ma) ont des fragments de granite et des mélan

Estilos ABNT, Harvard, Vancouver, APA, etc.

15

Barbeau, David Longfellow Jr. "Application of Growth Strata and Detrital-Zircon Geochronology to Stratigraphic Architecture and Kinematic History." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/244092.

Texto completo da fonte

Resumo:

Growth strata analysis and detrital-zircon geochronology are useful applications of stratigraphy to tectonic problems. Whereas both tools can contribute to kinematic analyses of supracrustal rock bodies, growth strata are also useful for analyzing the influence of tectonics on stratigraphic architecture. This study reports: 1) a conceptual model for growth strata development; 2) stratigraphic and kinematic analyses of growth strata architectures from growth structures in southeastern Utah, the Gulf of Mexico, and northeastern Spain; and 3) the detrital-zircon geochronology of the Salinian bloc

Estilos ABNT, Harvard, Vancouver, APA, etc.

16

Ghosh, Amiya Kumar. "Reconnaissance U-Pb geochronology of Precambrian crystalline rocks from the northern Black Hills, South Dakota: Implications for regional thermotectonic history." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1240007954.

Texto completo da fonte

Resumo:

Thesis (M.S.)--Kent State University, 2009.<br>Title from PDF t.p. (viewed Feb. 12, 2010). Advisor: Peter Dahl. Keywords: Black Hills; Crook Mountain granite; Homestake gold mine; gold mineralization; magmatism; metamorphism; metapelite; g monazite; zircon; titanite; geochronology; thermotectonism Includes bibliographical references (p. 97-106).

Estilos ABNT, Harvard, Vancouver, APA, etc.

17

Jones, Carson L. "U-Pb geochronology of monazite and zircon in Precambrian metamorphic rocks from the Ruby Range, SW Montana deciphering geological events that shaped the NW Wyoming province /." [Kent, Ohio] : Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1214308001.

Texto completo da fonte

Resumo:

Thesis (M.S.)--Kent State University, 2008.<br>Title from PDF t.p. (viewed Oct. 5, 2009). Advisor: Peter Dahl. Keywords: Geochronology; Radiometric Dating; Plate Tectonics. Includes bibliographical references (p. 106-109).

Estilos ABNT, Harvard, Vancouver, APA, etc.

18

Caquineau, Tom. "Etude géochronologique U-Pb et isotopique Lu-Hf sur zircon du groupe de Turee Creek : implications sur l’événement de grande oxygénation et les glaciations paléoprotérozoïques." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC236/document.

Texto completo da fonte

Resumo:

La transition Archéen – Protérozoïque (~2,45 Ga) est marquée par des bouleversements environnementaux majeurs dans l’histoire de la Terre (oxygénation de l’atmosphère et glaciations globales). Les séquences sédimentaires qui enregistrent ces événements ont été très étudiées en Amérique du Nord (séquence Huronienne) et en Afrique du Sud (Transvaal). Une séquence analogue sur le craton de Pilbara en Australie Occidentale (groupe de Turee Creek, TCG) contient 3 niveaux de diamictites glaciaires. 3 forages continentaux (Turee Creek Drilling Project, TCDP) ont été réalisés pour étudier la séquence.

Estilos ABNT, Harvard, Vancouver, APA, etc.

19

Harrison, Bianca. "Palaeoenvironments and position of the Precambrian–Cambrian boundary within the lower Vanrhynsdorp Group of South Africa: sedimentary facies analysis, U-Pb series zircon geochronology and micropalaeontology." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29450.

Texto completo da fonte

Resumo:

The Vanrhynsdorp Group is a mainly fluvio-marine siliclastic succession that outcrops in the northwestern part of South Africa. The critical Precambrian-Cambrian boundary falls within the group, however the depositional environments across the boundary, its exact stratigraphic position and nature are unresolved. The group was deposited in the Vanrhynsdorp Basin, which has been shown to be the southernmost extension of the Nama Foreland Basin. Consequently, the Vanrhynsdorp Group has been correlated with the world-famous Nama Group, which features diverse Ediacaran-Cambrian fossils. To date, no

Estilos ABNT, Harvard, Vancouver, APA, etc.

20

Linde, G. M., J. H. Trexler, P. H. Cashman, G. Gehrels, and W. R. Dickinson. "Three-Dimensional Evolution of the Early Paleozoic Western Laurentian Margin: New Insights From Detrital Zircon U-Pb Geochronology and Hf Isotope Geochemistry of the Harmony Formation of Nevada." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/626478.

Texto completo da fonte

Resumo:

Uranium-lead (U-Pb) geochronology and Hafnium (Hf) isotope geochemistry of detrital zircons of the Harmony Formation of north central Nevada provide new insights into the tectonic evolution of the Late Paleozoic western Laurentian margin. Using laser-ablation inductively coupled plasma mass spectrometry, 10 arenite samples were analyzed for U-Pb ages, and 8 of these samples were further analyzed for Hf isotope ratios. Three of the sampled units have similar U-Pb age peaks and Hf isotope ratios, including a 1.0-1.4Ga peak with epsilon Hf values of +12 to -3 and a 2.5-2.7Ga peak with epsilon Hf

Estilos ABNT, Harvard, Vancouver, APA, etc.

21

Ely, Kim Susan. "Geochronology of Timor-Leste and seismo-tectonics of the southern Banda Arc." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/7063.

Texto completo da fonte

Resumo:

Arc–continent collision is a significant plate boundary process that results in crustal growth. Since the early stages of evolution are often obscured in mature orogens, more complete understanding of the processes involved in arc–continent collision require study of young, active collision settings. The Banda Arc presents an exceptional opportunity to study a young arc–continent collision zone. This thesis presents aspects of the geology and geochronology of Ataúro and the Aileu Complex of Timor-Leste, and the tectonics of the Banda Arc.<br>U–Pb dating of detrital zircons from the Aileu Compl

Estilos ABNT, Harvard, Vancouver, APA, etc.

22

Ver, Hoeve Thomas James. "Applications of LA-ICP-MS analysis to zircon : assessing downhole fractionation and pre-treatment effects for U-Pb geochronology and trace element variations in accessory minerals from the Bushveld Complex." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/60201.

Texto completo da fonte

Resumo:

Zircon and other U-Th-Pb-bearing minerals are now recognized as key geochemical and geochronological tracers of the evolution of late-stage fractionated interstitial melt in mafic layered intrusions. Two separate, yet complementary, applications of laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) on zircon from layered intrusions are presented with the goals of advancing the analytical capabilities of LA-ICP-MS and showcasing the powerful geochemical fingerprinting of zircon. The effects of downhole fractionation, the time-dependent evolution of Pb-U ratios during laser

Estilos ABNT, Harvard, Vancouver, APA, etc.

23

Kuiper, Yvette Dominique. "Isotopic constraints on timing of deformation and metamorphism in the Thor–Odin dome, Monashee Complex, southeastern British Columbia." Thesis, Department of Geology, University of New Brunswick, 2003. http://hdl.handle.net/1882/46.

Texto completo da fonte

Resumo:

New and existing U–Pb and 40Ar/39Ar geochronological data, and oxygen and hydrogen stable isotope data, are combined with structural and metamorphic data from Thor–Odin, the southern culmination of the Monashee Complex. This leads to a new interpretation of the timing of deformation and metamorphism. Amphibolites in Thor–Odin with hornblende 40Ar/39Ar dates between ~75–70 and ~51 Ma experienced more 18O- and D-depletion than amphibolites with older dates. The younger dates that were previously interpreted as cooling ages, may have resulted from complete or partial Ar loss in the presence of m

Estilos ABNT, Harvard, Vancouver, APA, etc.

24

Andersson, Barbro. "Metamorphic Evolution of the Tjeliken Garnet-Phengite Gneiss, Northern Jämtland, Swedish Caledonides." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-276515.

Texto completo da fonte

Resumo:

The Tjeliken Mountain in northern Jämtland, central Scandinavian Caledonides is by most authors considered to belong to the Lower Seve Nappe Complex (SNC). However, recently P-T conditions similar to the Middle Seve have been constrained for the eclogite at the top of the mountain, revitalizing the tectonic debate about Tjeliken. Also the timing of high-pressure metamorphism is debated. Two earlier studies of the eclogite yield ages between 464 Ma and 446 Ma. This study focuses on the garnet-phengite gneiss hosting the eclogite. By construction of P-T conditions and dating the two discrepancie

Estilos ABNT, Harvard, Vancouver, APA, etc.

25

Weller, Owen M. "An integrated metamorphic and geochronological study of the south-eastern Tibetan plateau." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:f4104b43-389a-4d54-bd7b-ba3fc0e8ab95.

Texto completo da fonte

Resumo:

The Tibetan plateau is a vast, elevated region located in central Asia, which is underlain by the thickest crust known on Earth (up to 90 km). An outstanding question of importance to many fields within geology is how and why did the Tibetan plateau form? Models attribute the growth of the plateau to a consequence of the ongoing India-Asia continental collision, but differ in the details of how the crustal thickening was accommodated: was it by underplating of Indian lower crust or by homogeneous shortening? High-grade metamorphic rocks sampled from the region potentially hold the key to answe

Estilos ABNT, Harvard, Vancouver, APA, etc.

26

Dilles, Zoe Y. G. "Geochronologic and Petrologic Context for Deep Crustal Metamorphic Core Complex Development, East Humboldt Range, Nevada." Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/scripps_theses/811.

Texto completo da fonte

Resumo:

The Ruby-Humboldt Range in Northeastern Nevada exposes the deepest crust in the western portion of the Sevier Hinterland. The product of unique brittle and ductile accommodations, this block of lower crustal rock is a window into the processes of continental thickening and extension. The structure of the northern tip of the Ruby-Humboldt Range core complex is dominated by a large recumbent fold nappe with a southward closeure cored by Paleoproterozoic-Archean gneissic complexes with complex interdigitated field relationships that record polyphase continental metamorphism. Amphibolite-grade met

Estilos ABNT, Harvard, Vancouver, APA, etc.

27

André, Jefferson Lima Fernandes. "Comparação entre o Complexo Juiz de fora e a Unidade Granulítica Ponte de Zinco: geocronologia U-Pb em zircão (LA-ICPMS), geoquímica isotópica e composição das fontes geradoras." Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7250.

Texto completo da fonte

Resumo:

Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A comparação entre o Complexo Juiz de Fora e a Unidade Granulítica Ponte de Zinco (Mangaratiba - RJ) revelou que existem diferenças significativas entre essas unidades. Na Unidade Granulítica Ponte de Zinco, são encontrados ortogranulitos de composição granítica e granodiorítica, que representam o embasamento da Unidade, denominada aqui de Ortogranulitos Ribeirão das Lajes. Dois outros litotipos ortoderivados também foram encontrados: (i) um ortognaiss

Estilos ABNT, Harvard, Vancouver, APA, etc.

28

Cannic, Sébastien. "L'évolution magmatique et tectono-métamorphique du substratum du domaine valaisan (complexe du Versoyen, Alpes occidentales) : Implications dans l'histoire alpine." Grenoble 1, 1996. http://www.theses.fr/1996GRE10155.

Texto completo da fonte

Resumo:

Le domaine valaisan dessine une suture qui marque la limite entre les zones internes et externes des Alpes occidentales. Cette suture est constituée de roches magmatiques d'affinité tholéïtique (le complexe du Versoyen) dont l'interprétation géodynamique était controversée. En effet, suivant les auteurs, cette suture pourrait représenter: 1) une klippe d'origine piémontaise (suture d'hyper-collision), 2) une écaille ophiolitique située au front d'un prisme d'accrétion (suture océanique), 3) un complexe magmatique lié à un amincissement crustal (inversion structurale). Le but de ce travail étai

Estilos ABNT, Harvard, Vancouver, APA, etc.

29

Das, Abin. "Limitations and Improvements in Methods for Precise U-Pb Isotopic Dating of Precambrian Zircon." Thesis, 2012. http://hdl.handle.net/1807/33974.

Texto completo da fonte

Resumo:

This thesis addresses various issues in U-Pb zircon geochronology, proposing new experimental protocols in conventional chemical abrasion-isotope dilution thermal ionization mass spectrometry or CA-(ID)-TIMS and developing a new method for Pb evaporation-condensation from zircon that allows high precision Pb-Pb age determination on Precambrian samples. Various experiments are also done on zircon to extract U-Pb information by in situ flux aided fusion methods and to optimize a better silica gel Pb-ionization activator. Radiation damage caused by U decay in zircon disrupts its ‘closed system’ b

Estilos ABNT, Harvard, Vancouver, APA, etc.

30

Katuru, Venkata Pavan. "Tectonic and Isotopic evolution of the Dharwar Craton, India." Thesis, 2021. https://hdl.handle.net/2440/133494.

Texto completo da fonte

Resumo:

The crustal evolution of a craton could be studied from analysing its zircon U-Pb record and associated isotopic and elemental composition. The Dharwar Craton in southern India is one such craton on which several independent studies have been conducted on isolated domains within the craton. In this thesis, we have attempted to create a robust tectonic and isotopic evolution model of the Dharwar Craton which also includes previously published data. This thesis is divided into four chapters spanning from the Archean origins of the craton to the latest thermal events affecting various domains wit

Estilos ABNT, Harvard, Vancouver, APA, etc.

31

"Strategies for (U-Th)/Pb Geochronology of Impact Structures: Lessons from the West Clearwater Lake Crater, Canada." Master's thesis, 2019. http://hdl.handle.net/2286/R.I.54931.

Texto completo da fonte

Resumo:

abstract: Establishing the timing of impact crater formation is essential to exploring the relationship between bolide impact and biological evolution, and constraining the tempo of planetary surface evolution. Unfortunately, precise and accurate impact geochronology can be challenging. Many of the rock products of impact (impactites) contain relict, pre-impact phases that may have had their isotopic systematics completely reset during the impact event, only partially reset, or not reset at all. Of the many isotopic chronometers that have been used to date impactites, the U/Pb zircon chronomet

Estilos ABNT, Harvard, Vancouver, APA, etc.

32

Courtney-Davies, Liam. "Geochronology of Iron Oxides and Development of Matrix-Matched Reference Material for Routine U-Pb Dating." Thesis, 2019. http://hdl.handle.net/2440/123663.

Texto completo da fonte

Resumo:

Iron oxides, hematite and magnetite, are common minerals throughout rocks and ores of all types and ages. The discovery of U-bearing hematite at Olympic Dam, the largest iron oxide copper-gold (IOCG) deposit in the Gawler Craton (South Australia) prompted development of this mineral as a new U-Pb geochronometer. Unlike accessory minerals routinely used to track hydrothermal mineralisation, iron oxides are dominant components of Precambrian IOCG systems and therefore geochronology of iron oxides is pivotal to understand deposit evolution. Iron oxide minerals are studied in terms of U-Pb systema

Estilos ABNT, Harvard, Vancouver, APA, etc.

33

Reid, B. A. "Structural, geochronological and tectonic evolution of the central Eastern Ghats Province, India: Araku-Anantagiri-Visakhapatnam." Thesis, 2010. http://hdl.handle.net/2440/102762.

Texto completo da fonte

Resumo:

This item is only available electronically.<br>The central Eastern Ghats Province is part of a series of terranes that collectively form the Eastern Ghats in India. The Eastern Ghats is a Mesoproterozoic to early Neoproterozoic orogen associated with the formation of the supercontinent Rodinia, c. 1.1 to 0.95 Ga. The central Eastern Ghats Province consists of metaquartzites and metapelites (khondalites) that are intruded by granitoids. The location of proto-India within Rodinia is disputed because of recently presented palaeomagnetic data. This has generated confusion about whether the protoli

Estilos ABNT, Harvard, Vancouver, APA, etc.

34

Mickey, Jeremiah Lee. "Determining the Laurentide Ice Sheet and Bedrock Provenance of Midwestern Till by Applying U-Pb Geochronology to Detrital Zircons." Thesis, 2019. http://hdl.handle.net/1805/21294.

Texto completo da fonte

Resumo:

Indiana University-Purdue University Indianapolis (IUPUI)<br>A broad range of samples were collected from the Huron-Erie Lobe, Lake Michigan Lobe, Saginaw Lobe, and Tipton Till Plain of northern Indiana to determine the provenance of Laurentide Ice Sheet till in the Midwest U.S. during the Illinoian and Wisconsinan glaciations. U-Pb age distributions from approximately 300 detrital zircons (DZ) were used as provenance indicators for each till sample. Till from the Lake Michigan Lobe and was found to be largely homogenized. The distinct lobe DZ age distributions are the Lake Michigan Lobe till

Estilos ABNT, Harvard, Vancouver, APA, etc.

35

Cappello, Mariko. "New radiometric age constraints on the Ordovician-Silurian boundary from Anticosti Island (eastern Canada) and the Siljan district (Sweden)." Thesis, 2019. http://hdl.handle.net/1828/11089.

Texto completo da fonte

Resumo:

The transition from the end of the Ordovician to the beginning of the Silurian Period is characterized by the glaciation of the Gondwana paleocontinent, eustatic sea level change, a perturbation to the global carbon cycle and one of the ve major mass extinctions of the Phanerozoic Eon. Due to signi cant sea level fall, the Ordovician-Silurian (O-S) boundary is often marked by hiatus and exposure in the shallow marine geologic record (e.g., Copper et al. [2013]). Two locations that host stratigraphic succession close to the boudary are Anticosti Basin of Quebec (Canada, e.g., Desrochers et al

Estilos ABNT, Harvard, Vancouver, APA, etc.

36

Huang, Yi-Chang, and 黃奕彰. "Detrital zircon U-Pb geochronology constraint on the formation age of the Tananao Schist and tectonic implication, Taiwan." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70825041457560846349.

Texto completo da fonte

Resumo:

碩士<br>國立臺灣大學<br>地質科學研究所<br>103<br>The Tananao Schist, the oldest rock, exposed at the Backbone Range which consists of marble, schist, gneiss, and subordinate scattered metabasites. According to the stratigraphy and structural analysis, the Tananao Schist in the ascending order can be divided into the Chiuchu Marble, the Kuyuan Schist, the Paiyang Schist, the Tienchang marble, and the Pilu Formation. Based on previous study, depositional age of the Chiuchu Marble is closed to 250±20 Ma(Late Permian). Using zircon U-Pb dating method, magmatic age of gneiss (I-type granite) yields 90- 86 Ma. Dep

Estilos ABNT, Harvard, Vancouver, APA, etc.

37

Wenk, H. L. "The tectonic evolution of the North Qinling Terrane, Qinling Orogen, Central China." Thesis, 2016. http://hdl.handle.net/2440/121357.

Texto completo da fonte

Resumo:

This item is only available electronically.<br>The Qinling Orogenic Belt represents a collisional orogen, involving a complex architectural and geological history from the Proterozoic to late Palaeozoic. The timing of plate collision and orogenesis is under debate, due to the presence of highly deformed and metamorphosed exotic terranes within the orogeny. One such terrane is the North Qinling Terrane, which comprises a metasedimentary sequence of gneisses, schists, marbles and amphibolites known as the Qinling Group. Its origin and evolution are not well known, but it forms a well-defined

Estilos ABNT, Harvard, Vancouver, APA, etc.

38

Fields, C. E. "Liebig-aged (c. 1640 Ma) magmatism and metamorphism in c. 1760 Ma crust in the Warumpi and southern Aileron Province, central Australia: a case for revising the tectonic framework of Proterozoic Australia." Thesis, 2012. http://hdl.handle.net/2440/92217.

Texto completo da fonte

Resumo:

This item is only available electronically.<br>The southern margin of the North Australian Craton (NAC) has been suggested to represent a long-lived (c. 1860 to 1600 Ma) active margin that preserves a cryptic record of the growth and assembly of the Australian continent. The Warumpi Province is juxtaposed against the southern Aileron Province, and has been interpreted as exotic to the NAC, though the timing of collision between the Warumpi Province and the southern Aileron Province is contentious. U-Pb zircon and monazite LA-ICP-MS geochronology from granulite facies metapelites and granitic g

Estilos ABNT, Harvard, Vancouver, APA, etc.

39

Trestrail, J. L. "U-Pb detrital zircon, geochemical and Nd isotope constraints on sedimentary provenance of the Chewings Range Quartzite, Warumpi Province, Arunta Region, NT." Thesis, 2010. http://hdl.handle.net/2440/106279.

Texto completo da fonte

Resumo:

This item is only available electronically.<br>The Chewings Range Quartzite is a meta-sedimentary cover sequence located in the Warumpi Province of the Arunta Region. U-Pb detrital Zircon analysis of the Chewings Range Quartzite indicates a minimum depositional age of ~ 1640Ma, with the main population of zircons residing within a range of 1700 – 1800Ma. Evidence from Sm-Nd isotopic data suggests that a series of Staurolite Garnet Schists, often grouped with the Chewings Range Quartzite, has a significantly more juvenile character. This suggests that it may represent a new unit with a signific

Estilos ABNT, Harvard, Vancouver, APA, etc.

40

Kinney, Sean Thomas. "Re-evaluating the timescale of rift and post-rift magmatism on the Eastern North American Margin via zircon U-Pb geochronology." Thesis, 2021. https://doi.org/10.7916/d8-hwtn-b231.

Texto completo da fonte

Resumo:

The modern plate tectonic paradigm provides a predictive model to understand what mediates dynamic processes at both plate margins and intraplate settings. At some locations on the Earth, the geological record provides evidence of apparent violations of this theoretical framework. In this dissertation, I examine a region on the rifted continental margin of Eastern North America, where at least four distinct episodes of magmatism occurred (in the Late Triassic, Early Jurassic, Early Cretaceous) since the onset of rifting and ultimate breakup of the supercontinent Pangea. It also coincides with

Estilos ABNT, Harvard, Vancouver, APA, etc.

41

Chou, Hsien-Yuan, and 周賢元. "Detrital zircon U-Pb geochronology of the Eocene to Pliocene Series in central Taiwan: Implications for source provenance and exhumation history." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68841602653829555873.

Texto completo da fonte

Resumo:

碩士<br>國立臺灣大學<br>地質科學研究所<br>101<br>Detrital zircons collected from sedimentary rocks can find out exhumation history for the U-Pb dating. This study aims to reconstruct the Eocene–Miocene exhumation history of the southeast China by using U-Pb detrital zircon geochronology. The samples were collected from the Eocene-Miocene formation along the Beigang river and the upper Miocene formation from the Daan river. Each sample contains about 80-100 zircons U-Pb dating data with LA-ICPMS. Zircon formed from igneous activity or metamorphism of the source province. U-Pb dates are distributed to severa

Estilos ABNT, Harvard, Vancouver, APA, etc.

42

Kolesik, P. "U–Pb geochronology of volcano–sedimentary moraine sediments of the Bunger Hills: implications for Mesoproterozoic evolution of East Antarctica." Thesis, 2016. http://hdl.handle.net/2440/120941.

Texto completo da fonte

Resumo:

This item is only available electronically.<br>The Bunger Hills and adjacent areas of Wilkes Land and Queen Mary Land occupy the very western periphery of the Musgrave–Albany–Fraser Orogen, and represent one of the few exposures within east Antarctica with direct correlations to Australian constituent terrains of this continental-scale system. U–Pb analyses of detrital zircons from volcano–sedimentary moraine sediments of the Bunger Hills yield concordant 206Pb/238U ages ranging from ca. 1364 Ma to ca. 1040 Ma (n = 842), with a main late Mesoproterozoic magmatic zircon population clustered at

Estilos ABNT, Harvard, Vancouver, APA, etc.

43

Yeshanew, Fitsum Girum. "Crustal evolution of the Arabian–Nubian Shield : Insights from zircon geochronology and Nd–Hf–O isotopes." Doctoral thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145479.

Texto completo da fonte

Resumo:

The Arabian–Nubian Shield (ANS) represents a major site of juvenile Neoproterozoic crustal addition on Earth and documents Neoproterozoic tectonics bracketed by two supercontinent cycles, namely the fragmentation of Rodinia and the amalgamation of Gondwana. There is general consensus that the ANS formed by juvenile magmatic arc accretion and subsequent shield–wide post–tectonic magmatism. However, detailed understanding about the timing of events and the nature of magma sources in parts of the shield are lacking. To date, there are no isotopic data from the Paleozoic sedimentary sequences of t

Estilos ABNT, Harvard, Vancouver, APA, etc.

44

McLeish, Duncan Forbes. "Structure, stratigraphy, and U-Pb zircon-titanite geochronology of the Aley carbonatite complex, northeast British Columbia: Evidence for Antler-aged orogenesis in the Foreland Belt of the Canadian Cordillera." Thesis, 2013. http://hdl.handle.net/1828/4560.

Texto completo da fonte

Resumo:

The tectonic significance and age of carbonatite intrusions in the western Foreland Belt of the Canadian Cordillera are poorly constrained. Recent 1:5,000 scale field mapping of one of these carbonatite intrusions, the Aley carbonatite (NTS 94 B/5), has demonstrated that it was emplaced as a syn-kinematic sill, coeval with a major nappe-forming tectonic event. Determining the age of the Aley carbonatite therefore provides a means of directly dating tectonism related to carbonatite magmatism. A U-Pb titanite age of 365.9 +/- 2.1 Ma was obtained from the Ospika pipe, an ultramafic diatreme spati

Estilos ABNT, Harvard, Vancouver, APA, etc.

45

Sams, David Bruce. "U/Pb Zircon Geochronology, Petrology, and Structural Geology of the Crystalline Rocks of the Southernmost Sierra Nevada and Tehachapi Mountains, Kern County, California." Thesis, 1986. https://thesis.library.caltech.edu/2961/1/Sams_db_1986.pdf.

Texto completo da fonte

Resumo:

<p>Field mapping, petrography, U/Pb zircon geochronology, and Rb/Sr geo-chemistry on the crystalline rocks of the southernmost Sierra Nevada and Tehachapi Mountains north of the Garlock fault have 1) generated a structural, geo-chemical, and geochronological framework; 2) demonstrated a continuation of Sierran plutonic and metasedimentary rocks into the Tehachapi Mountains; 3) indicated that the region, in particular the gneiss complex of the Tehachapi Mountains, represents the deepest exposed levels of the Sierra Nevada batholith; 4) placed constraints on possible mixing models between upper

Estilos ABNT, Harvard, Vancouver, APA, etc.

46

Todd, Christopher Noel. "The sedimentary evolution of Permian to Cretaceous basins in Queensland, Australia: insights from lithostratigraphy, U–Pb zircon geochronology, sedimentary facies, and provenance analysis." Thesis, 2020. https://researchonline.jcu.edu.au/70946/1/JCU_70946_Todd_2020_thesis.pdf.

Texto completo da fonte

Resumo:

Christopher Todd investigated the geology of Permian to Cretaceous rocks of the Galilee and Eromanga basins in Queensland. He provides constraints on stratigraphy, depositional environments, and ages of the strata, paying close attention to the poorly-studied Jurassic. Results help to characterise the economic hydrocarbon and groundwater systems within these basins.

Estilos ABNT, Harvard, Vancouver, APA, etc.

47

Meaney, Kieran James. "Proterozoic crustal growth in the southeastern Gawler Craton: the development of the Barossa Complex, and an assessment of the detrital zircon method." Thesis, 2017. http://hdl.handle.net/2440/114255.

Texto completo da fonte

Resumo:

The Barossa Complex, southeast Gawler Craton, South Australia, forms the southeastern-most exposure of pre-Neoproterozoic crust in Australia. Understanding the geodynamic evolution of this area can improve paleogeographic reconstructions of the economically significant Gawler Craton, as well as global reconstructions in the Proterozoic. The first part of this thesis addresses the geological development of the Barossa Complex during the Palaeo-Mesoproterozoic. The Barossa Complex is composed of metasedimentary and metaigneous gneisses. These include calcsilicate, quartzofeldspathic, psammopeli

Estilos ABNT, Harvard, Vancouver, APA, etc.

48

Li, Shih-Chuan, and 李時全. "Detrital zircon U-Pb geochronology of the Late Miocene-Pleistocene formations in the Northern Taiwan to source provenance and the unroofing history of Taiwan orogenic belt." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qxs4s7.

Texto completo da fonte

Resumo:

碩士<br>國立臺灣大學<br>地質科學研究所<br>106<br>Lithostratigraphy, magnetostratigraphy, depositional environment and sandstone compositions of foreland basin deposits in western Taiwan, from late Miocene to Pleistocene strata, have been systematically researched. According to the petrographic studies of foreland basin deposits, sedimentary provenance originated from southeastern China (the Cathaysia Block) in Eocene-Miocene, but progressively switched to Taiwan orogenic belt due to the arc-continental collision since late Miocene (~6.0 Ma). Furthermore, the Hsuehshan Range and the Western Foothills were upl

Estilos ABNT, Harvard, Vancouver, APA, etc.

49

Al-Kiyumi, M. "Constraining the age and provenance of the basal quartzites of the Centralian Superbasin." Thesis, 2018. http://hdl.handle.net/2440/130321.

Texto completo da fonte

Resumo:

This item is only available electronically.<br>The Heavitree Formation of the Amadeus Basin, central Australia, is thought to correlate with a number of similar formations in the Officer, Ngalia, Georgina and Murraba Basins that formed the Centralian Superbasin. The Jasper Gorge Formation of the Victoria Basin and Jamison Sandstone of the Beetaloo Sub-basin are also thought to be corollaries. These formations are all constrained to being younger than ca. 1.0 Ga by U-Pb detrital zircon studies. However, in all cases, this is suspected to considerably pre-date the timing of deposition. Here,

Estilos ABNT, Harvard, Vancouver, APA, etc.

50

Quelhas, Pedro Moniz. "Petrology and geochemistry of the igneous rocks from Macao (South China) : Tectono-magmatic implications." Doctoral thesis, 2019. http://hdl.handle.net/10451/44158.

Texto completo da fonte

Resumo:

The territory of Macao is composed of several granitic intrusions belonging to one of the biggest granite provinces in the world, the Southeast China Magmatic Belt (SCMB), located in the southeast (SE) area of the Cathaysia Block. The SCMB is known by the occurrence of large volumes of Mesozoic magmatic rocks (over 90% are granitic rocks and equivalent volcanic rocks with minor basalts), occupying a total outcrop area of nearly 200.000 km2. The geology of Macao (~30 Km2) is dominated by granitic rocks displaying a wide range of textural, mineralogical and chemical features, making it an ideal

Estilos ABNT, Harvard, Vancouver, APA, etc.

Oferecemos descontos em todos os planos premium para autores cujas obras estão incluídas em seleções literárias temáticas. Contate-nos para obter um código promocional único!