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Dissertations / Theses on the topic 'Early Jurassic'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Jones, Charles Edward. "Strontium isotopes in Jurassic and Early Cretaceous seawater." Thesis, University of Oxford, 1992. http://ora.ox.ac.uk/objects/uuid:fe3733bd-8e31-4bba-a78b-6d8275a0075f.

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The collection and analysis of a large number of belemnites and oysters with excellent biostratigraphic and diagenetic control has resulted in a highly detailed determination of the seawater Sr-isotope curve through the Jurassic and Early Cretaceous. The new data confirm the broad trends established by previous work, but the much sharper resolution of the new data allows the application of Sr-isotope stratigraphy with an optimal stratigraphic resolution of ± 1 to 4 ammonite subzones (± 0.5 to 2 Ma). The data show a general decline from the Hettangian (Early Jurassic) to a minimum in the Callov

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2

Caruthers, Andrew Harry. "Pliensbachian–Toarcian (Early Jurassic) extinction in western North America." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44233.

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The Pliensbachian–Toarcian marine extinction is observable at the species and generic levels. Ammonite diversity data from Europe and parts of the Arctic suggest a multi-phased event with diversity declining over six separate intervals. The main-phase of decline begins at the Pliensbachian–Toarcian boundary and extends into the Early Toarcian to a level correlative with the Tenuicostatum / Serpentinum Zone boundary. To date only this main-phase has been demonstrated as being global in extent, affecting multiple taxonomic groups. The entire Pliensbachian-Toarcian extinction has been attributed

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3

Carter, Elizabeth Sibbald. "Early and middle Jurassic Radiolarian biostratigraphy, Queen Charlotte Islands, B.C." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24586.

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Radiolarian biostratigraphy is used to construct an informal zonation for sediments of upper Pliensbachian to lower Bajocian age from the Maude and Yakoun Formations, Queen Charlotte Islands, B.C. Paleoenvironmental studies assess depositional environment and the effects of changing facies relationships on the fauna. Seven distinctive assemblages are recognized comprising 167 species of spumellarian and nassellarian Radiolaria. The first well established middle Toarcian radiolarian assemblages are documented and both these and upper Toarcian assemblages are highly diverse and contain many new

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4

Damborenea, S. E. "Early Jurassic bivalvia of Argentina : superfamilies Monotacea, Pectinacea and Plicatulacea." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636339.

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The revision of Early Jurassic monotacean, pectinacean and plicatulacean bivalves is based on museum material and own collections from 50 localities in the provinces of San Juan, Mendoza and Neuqué in western Argentina. Twenty-four species belonging to 17 genera of the families Monotidae, Oxytomidae, Asoellidae, Propeamussiidae, Entoliidae, Pectinidae, Terquemidae, Plicatulidae, Placunopsidae and Dimyidae are systematically described. The new pectinid genus <i>Agerchlamys</i> and new species of <i>Kolymonectes, Entolium</i> and <i>Terquemia</i> are proposed. All other species are referred to p

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5

Rose, Graham. "Late Triassic and early Jurassic radiolarians from Timor, eastern Indonesia." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283443.

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6

TANAKA, Shiro, Yusei KUROYANAGI, Kazuhiro SUZUKI, and Mamoru ADACHI. "Permo-Triassic and Early-Middle Jurassic granitoid clasts from the Jurassic conglomerates in the Mino terrane, central Japan." Dept. of Earth and Planetary Sciences, Nagoya University, 2002. http://hdl.handle.net/2237/2854.

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7

Caswell, Bryony Amber. "The response of the marine biota to the early Toarcian [Early Jurassic) oceanic anoxic event." Thesis, Open University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.524703.

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8

Aliyev, Kanan. "Evaluating permeability anisotropy in the early Jurassic Tilje formation, offshore mid-Norway." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/2794.

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The problem of evaluating permeability anisotropy in the Tilje Formation, Heidrum field, offshore mid-Norway, has been investigated by the Statoil Research Centre by a detailed combination of the geological and petrophysical data. The large diversity and contrasting levels of heterogeneity within depositional facies observed in the Tilje Formation reflect complicated patterns of deposition along deltaic shorelines and the adjunct shelf of a tidally influenced, narrow seaway. Permeability anisotropy can alter the directionality of the fluid flow in the reservoir, and thereby affect the most im

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9

Ceglar, Nathan. "Late Jurassic to Early Cretaceous sequence stratigraphy, Northern Bonaparte Basin, Timor Sea /." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09SB/09sbc389.pdf.

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10

Groecke, Darren Richard. "Isotope stratigraphy and ocean-atmosphere interactions in the Jurassic and Early Cretaceous." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393117.

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11

Piazza, Veronica. "Response of early Toarcian (Early Jurassic) benthic marine faunas from South-Western Europe to temperature-related stressors." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22950.

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Globaler Temperaturanstieg, Ozeanversauerung und Sauerstoffmangel (temperaturbedingte Stressoren), spielen eine wichtige Rolle während Klimawandel. Die kombinierten Auswirkungen wirken sich negativ auf marine Lebensgemeinschaften und Ökosystemen aus und verschärfen die Effekte anderer Stressoren. Es gibt für den aktuellen und vergangenen Erwärmungsphasen Belege für veränderte Artenverteilung, Lebensraumverlust, Artensterben und verminderte physiologische Leistungen von Organismen. Die spezifischen Mechanismen werden diskutiert. Umweltveränderungen in der Erdvergangenheit bieten die Gelegenheit

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12

Knight, Eleanor. "Thermochronology of Early Jurassic Exhumation of the Yukon-Tanana Terrane, West-central Yukon." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22933.

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This study utilised U-Pb geochronology, and 40Ar/39Ar and (U-Th)/He thermochro-nology to delineate arc magmatism, metamorphism, and exhumation of the pericratonic Yukon-Tanana terrane in the McQuesten map area of west-central Yukon, Canada. SHRIMP U-Pb ages delineate Mid to Late Paleozoic arc magmatism and fit key units into the regional lithotectonic framework of the terrane. The juxtaposition of unmetamorphosed and predomi-nantly undeformed Devono-Mississippian rocks in the northwest of the study area with polydeformed and up to amphibolite facies metamorphosed rocks in the southwest suggest

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13

Lott, Graham Keith. "Late Triassic, Jurassic and Early Cretaceous geology of the Southern North Sea Basin." Thesis, University of Leicester, 1985. http://hdl.handle.net/2381/8430.

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The primary aim of this thesis is to provide a comprehensive assessment of the geology of the Southern North Sea Basin during the Jurassic and Early Cretaceous. In order to achieve this the integration of a wide variety of data has been undertaken, including the interpretation of shallow seismic profiles, downhole geophysical log correlation and petrographic descriptions of all available core and seabed sample information from the offshore area. A number of onshore cored borehole sequences were examined in some detail to establish some control points with which to compare the largely uncored o

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14

Azmi, Azrin. "Late Triassic to early Jurassic microfossils and palaeoenvironments of the Waterloo Mudstone Formation." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8517/.

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Northern Ireland Waterloo Mudstone Formation has received relatively little attention due to the scarcity of exposures and poor availability of subsurface records. The recent recovery of latest Triassic to Early Jurassic strata from boreholes permits further study of biostratigraphical and palaeoenvironmental using foraminifera and ostracods. The samples are from boreholes (Ballinlea-1, Magilligan and Carnduff-1) and exposures (White Park Bay, Tircrevan Burn, Larne, Ballygalley, Ballintoy and Kinbane Head). The age of the sections, established using foraminiferal biozonation ranges from latest

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15

Hylton, Mark Donald. "Microfaunal investigation of the Early Toarcian (Lower Jurassic) extinction event in N.W. Europe." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/2027.

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The Early Jurassic was a time of rapidly rising sea-level associated with the extensive spread of anoxic bottom waters. Sea-level rise across the Pliensbachian - Toarcian boundary culminated in the falciferum Zone of the Toarcian and is one of the best authenticated eustatic events in the Jurassic. This major transgressive pulse was marked by deepw ater marine sequencesa nd was associatedw ith the deposition of organic-rich shales. The development of anoxia coincides with a notable period of mass extinction of the marine fauna. High resolution sampling and study of the microfaunast hrough sequ

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16

Morgans, Helen Sarah. "Early to middle Jurassic stratigraphic development, vegetation and climate change in north-western Europe." Thesis, University of Oxford, 1997. http://ora.ox.ac.uk/objects/uuid:4b5cae3c-7562-45b9-b2a2-543b2649b24f.

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The aim of work presented in this thesis was to explore the inter-relationships of cyclic sedimentation, relative sea-level change, and palaeoclimate as inferred from plant megafossils. To this end, the investigation focused on the classic plant-bearing Middle Jurassic succession of Yorkshire. The Middle Jurassic (Aalenian-Bathonian) Ravenscar Group of the Cleveland Basin (Yorkshire) comprises a predominantly fluvio-deltaic succession intercalated between thinner, laterally persistent marine units. There is a pronounced lateral facies change across the basin, from mainly alluvial sediments in

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17

Piazza, Veronica [Verfasser]. "Response of early Toarcian (Early Jurassic) benthic marine faunas from South-Western Europe to temperature-related stressors / Veronica Piazza." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1236897021/34.

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18

Swientek, Oliver. "The Greenland Norwegian Seaway climatic and cyclic evolution of Late Jurassic-Early Cretaceous sediments /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965036944.

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19

Kagya, Meshack L. N. "The source rock and petroleum geochemistry of the Early Jurassic Poolowanna Formation, Eromanga Basin /." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phk118.pdf.

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20

Phethean, Jordan Jerad John. "Breakup of the Gondwana supercontinent : East African perspectives from the Early Jurassic to Cretaceous." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12667/.

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Accurate mapping of first-order tectonic features such as oceanic fracture zones and continental margins is vital for the production of reliable plate reconstructions. These reconstructions allow for a better understanding of the palaeo-configuration of continental fragments within Gondwana and ultimately provide insight into how and why supercontinents break apart. Detection of spreading lineaments within the heavily sedimented Western Somali Basin (WSB) has been achieved using a novel technique based on directional derivatives of free-air gravity. This new lineament dataset allows for the co

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21

Turner, Holly Emily. "Integrated correlation of the Kimmeridge Clay Formation (Late Jurassic-Early Cretaceous) : a Boreal-Tethyan transect." Thesis, University of Portsmouth, 2018. https://researchportal.port.ac.uk/portal/en/theses/integrated-correlation-of-the-kimmeridge-clay-formation-late-jurassicearly-cretaceous(d56f96c2-d8f4-4c60-a3ea-69913049d917).html.

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The Kimmeridge Clay Formation (Upper Jurassic‒Lower Cretaceous) is a widely deposited mudrock that has a high total organic carbon content and is a major petroleum source rock of the North Sea, Norwegian Sea and Barents Sea. The Late Jurassic and Early Cretaceous were characterised by a number of carbon cycle perturbations and a climatic shift in north-western Europe from relatively humid to arid and back to humid conditions. Precise correlation of the KCF in north-western Europe is critical for assessing the temporal and geographic extent of these events, stratigraphic fidelity, and the natur

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22

Wilkinson, Ian Paul. "Latest Jurassic and Early Cretaceous ostrocoda in eastern England and southern North Sea Basin : a biostratigraphy." Thesis, Aberystwyth University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.576093.

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23

Zhao, Tie. "Petrology of the late Jurassic to early Cretaceous coals from the Yang Cao Gou Basin, northeast China /." Title page, contents and abstract only, 1993. http://web4.library.adelaide.edu.au/theses/09SM/09smz51.pdf.

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24

Sanchez, Hernandez Barbara. "The upper jurassic-early cretaceous dinosaurs and other vertebrates form the Galve and Cameros Basins, NE Spain." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529822.

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25

Hou, Pengfei. "Sinemurian (Early Jurassic) stratigraphy at Last Creek, British Columbia and Five Card Draw, Nevada : paleontology and environmental implications." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50066.

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Over 400 ammonite specimens were collected from the Last Creek Formation in Last Creek, British Columbia and the Sunrise Formation in Five Card Draw, Nevada. A detailed taxonomic study from the Involutum Zone to the lower part of the Harbledownense Zone of the Sinemurian is presented. At least 38 species are identified and described, distributed amongst 15 genera and 5 families. Three species are introduced as new: Tipperoceras n. sp. A, Tmaegoceras obesus n. sp., Arnioceras n. sp. A. Also, Echioceratidae gen. et sp. indet. is tentatively introduced as a new species and genus. The following zo

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26

Nunn, Elizabeth Victoria. "Late Jurassic to Early Cretaceous stable isotope and geochemical records from the northern high latitudes : implications for palaeoclimate." Thesis, University of Plymouth, 2007. http://hdl.handle.net/10026.1/861.

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The Jurassic and Cretaceous periods are widely accepted as being dominated by greenhouse conditions with elevated CO2 levels and warm polar regions. Although much compelling evidence to support this idea of global warmth exists, some recent studies propose that the greenhouse climate may at times have been punctuated by sub-freezing polar conditions and the presence of limited polar ice. The evidence, however, is somewhat equivocal and is both spatially and temporally limited with much of this research until now being concentrated in mid- to low latitudes, despite it being generally accepted t

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27

Wolniewicz, Andrzej. "The anatomy, taxonomy and systematics of Middle Triassic-Early Jurassic ichthyosaurs (Reptilia: Ichthyopterygia) and the phylogeny of Ichthyopterygia." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:8855adf9-0a5a-46d3-b848-1f7d9865e479.

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Ichthyosaurs were a successful group of Mesozoic marine reptiles spanning a time interval of nearly 160 million years, from the Early Triassic to the early Late Cretaceous. Although ichthyosaurs have a long history of research, dating back to the early 18<sup>th</sup> century, significant controversies still surround their anatomy, taxonomy and evolution. The revision of the cranial anatomy of the basal ichthyosaur Cymbospondylus from the Middle Triassic (Anisian) resolves a 100-year controversy surrounding the arrangement its skull bones. Comparisons with the recently discovered colossal, pre

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28

Baron, Matthew Grant. "The origin and early evolution of the Dinosauria." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271890.

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For 130 years dinosaurs have been divided into two distinct clades – Ornithischia and Saurischia. This dissertation looks at the earliest evolution of the clade Dinosauria by focusing upon the interrelationships of the major subsidiary clades within it. It does this following examination, comparison and description of early dinosaur material, and by utilising modern phylogenetic analysis techniques, to rigorously and objectively test the fundamental groupings within the clade Dinosauria using a newly compiled dataset of early dinosaurs and other dinosauromorphs (= close dinosaur relatives). Th

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29

Evans, Mark. "A new genus of plesiosaur (Reptilia: Sauropterygia) from the Pliensbachian (Early Jurassic) of England, and a phylogeny of the Plesiosauria." Thesis, University of Leicester, 2012. http://hdl.handle.net/2381/10921.

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Two new species of plesiosaur have been recognised from the Pliensbachian (Early Jurassic) of England. They share derived characters and so are referred to the same new genus, Raptocleidus. Raptocleidus blakei is from Blockley Station Quarry, Gloucestershire (holotype specimen LEICT G1.2002) while Raptocleidus bondi is from the coast of Dorset (holotype specimen NHMUK R16330). The two new species share characters with different family-level groups of plesiosaur; the pliosaurids, leptocleidians and rhomaleosaurids. This makes classification of the new taxa problematic using purely comparative a

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30

Elsner, Martin [Verfasser], Reinhard [Akademischer Betreuer] Gaupp, and Hilmar von [Akademischer Betreuer] Eynatten. "Triassic to early Jurassic sandstones in North Victoria Land, Antarctica : composition, provenance, and diagenesis / Martin Elsner. Gutachter: Reinhard Gaupp ; Hilmar von Eynatten." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2011. http://d-nb.info/1016555075/34.

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31

Wood, S. E. L. "Late Jurassic to Early Cretaceous dinoflagellate cysts from the eastern Gulf of Mexico : facilitating future exploration and development activities in the basin." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/16271/.

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32

Holwerda, Femke Marleen [Verfasser], and Oliver [Akademischer Betreuer] Rauhut. "Revision of basal sauropods from the Middle Jurassic of Patagonia and the early evolution of sauropods / Femke Marleen Holwerda ; Betreuer: Oliver Rauhut." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1204365504/34.

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33

Brysch, Sven [Verfasser], and Wolfgang [Akademischer Betreuer] Stinnesbeck. "Changes in climate and palaeoenvironment during the Late Jurassic–Early Cretaceous in southern South America and western Antarctica / Sven Brysch ; Betreuer: Wolfgang Stinnesbeck." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177044064/34.

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34

Langrock, Uwe. "Late Jurassic to Early Cretaceous black shale formation and paleoenvironment in high northern latitudes = Spätjurassische bis frühkretazische Schwarzschiefergenese und Paläoumwelt in hohen nördlichen Breiten /." Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung, 2004. http://www.gbv.de/dms/goettingen/385716125.pdf.

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35

Konwert, Martin [Verfasser]. "Contributions to the Taxonomy, Diversity and Palaebiogeography of certain basal Teleostei (Osteichthyes, Actinopterygii) from the Early and Late Jurassic of Central Europe / Martin Konwert." Greifswald : Universitätsbibliothek Greifswald, 2018. http://d-nb.info/1150187360/34.

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36

Chaumeil, Rodriguez Micaela. "Calcareous nannofossils from Los Molles Formation, south of Huincul High, Neuquén Basin, Argentina : biostratigraphy and paleobiogeographic reconstructions for the Early to Middle Jurassic (Pliensbachian-Aalenian)." Electronic Thesis or Diss., Lyon 1, 2023. http://www.theses.fr/2023LYO10116.

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Les nannofossiles calcaires représentent un groupe diversifié de fossiles, remontant au Trias supérieur et s'étendant jusqu'à nos jours, caractérisés par leur composition calcaire et une taille inférieure à 30 µm. Parmi eux, les coccolithophoridés, qui constituent la fraction la plus importante du nannoplancton calcaire, c'est-à-dire des algues unicellulaires flagellées typiquement marins appartenant à la sous-classe Calcihaptophycidae, recouvertes de plaques de carbonate de calcium (coccolithes). Les représentants fossiles des coccolithophoridés correspond à leurs restes d'exosquelette, génér

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37

Jenkins, C. C. "The organic geochemical correlation of crude oils from early Jurassic to late Cretaceous Age reservoirs of the Eromanga Basin and late Triassic Age reservoirs of the underlying Cooper Basin /." Title page, contents and abstract only, 1987. http://web4.library.adelaide.edu.au/theses/09SM/09smj521.pdf.

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38

Andrieu, Simon. "Lien entre diagenèse des discontinuités, faciès sédimentaire et stratigraphie séquentielle : exemple de la plateforme carbonatée de l'ouest de la France (Aalénien-Oxfordien)." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS514/document.

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Les objectifs de cette thèse sont (1) de définir les facteurs contrôlant le développement à grande échelle des plateformes carbonatées intracratoniques et (2) de relier la diagenèse précoce des discontinuités avec les paléoenvironnements et les modèles de stratigraphie séquentielle. L’évolution de la plateforme carbonatée de l’ouest de la France a été reconstituée de l’Aalénien à l’Oxfordien (17 millions d’années). La topographie du socle contrôle la répartition latérale des bathymétries jusqu’au Bathonien moyen. La tectonique régionale favorise ou empêche localement la production carbonatée.

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39

Stumpf, Sebastian [Verfasser]. "A synoptic review of the vertebrate fauna from the “Green Series” (Toarcian) of northeastern Germany with descriptions of new taxa: A contribution to the knowledge of Early Jurassic vertebrate palaeobiodiversity patterns / Sebastian Stumpf." Greifswald : Universitätsbibliothek Greifswald, 2017. http://d-nb.info/1136397132/34.

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40

Holtzapffel, Thierry. "Minéraux argileux lattes : les smectites du domaine atlantique." Angers, 1986. http://www.theses.fr/1986ANGE0006.

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Les smectites des sédiments atlantiques du jurassique supérieur à l'actuel ; on distingue des particules floconneuses mixtes et lattées. Les premières, d'origine détritique probable, n'ont subi aucune modification post-sédimentaire ; les dernières résultent du réajustement diagenétique précoce des premières. L'intensité de ce réajustement, qui a lieu à bilans chimique et minéralogique pratiquement constants, a été quantifiée puis comparée à de nombreux paramètres sédimentaires. Trois facteurs importants : microperméabilité initiale du sédiment, temps de contact entre particules et fluides inte

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41

Meunier, Jean-Dominique. "Mécanismes de concentration de l'uranium dans les sédiments : génèse des gisements de type tabulaire." Nancy 1, 1989. http://www.theses.fr/1989NAN10346.

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Les mécanismes de concentration de l'uranium dans les formations sédimentaires sont étudiés dans le but de modéliser les gisements de type tabulaire. De nouveaux traceurs de l'uranium sont proposés grâce à l'utilisation de la cathodoluminescence et des deséquilibres isotopiques dans la famille de l'#2#3#8U. Dans le gisement de coutras (Gironde, France), situé dans des sables lutetiens, l'uranium se concentre au cours de la diagénèse précoce, en formant des complexes d'uranyle avec la matière organique. Au cours d'une simulation expérimentale de la diagénèse thermique, ces complexes d'uranyle s

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42

Zhang, Jin. "From extinction to recovery : Late Triassic and Early-Middle Jurassic ammonoid morphology." Thesis, 2002. http://hdl.handle.net/2429/14386.

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As one of the five largest mass extinctions occurring in the Phanerozoic, the extinction at the end of the Triassic dramatically affected the evolution of ammonoids, taxonomically and morphologically. The major aim of this thesis is to compare and contrast the ammonoid morphological evolution for the Upper Triassic Carnian Stage through the Middle Jurassic Bajocian Stage and explore the relationships among ammonoid morphospace, ornamentation, and suture types. "Buckman's law of covariation" (Westermann, 1966) indicates that, in the Bajocian, certain combinations of ammonoid morphological param

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43

Ross, Daniel John Kerridge. "Sedimentology, geochemistry and gas shale potential of the early Jurassic Nordegg member, northeastern British Columbia." Thesis, 2004. http://hdl.handle.net/2429/16204.

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The Early Jurassic Nordegg Member in north-eastern British Columbia (NEBC) is composed of 25-30 m of organic-rich marine strata. The unit was deposited in a restricted basinal environment, west of a high standing carbonate platform. The Nordegg Member consists of four lithological facies: (A) a basal conglomeratic lag deposit; (B) a lower phosphatic marlstone that was deposited during highly productive conditions; (C) an overlying marlstone which represents an anoxic phase of sedimentation; and (D) an upper phosphatic mudstone reflecting a productive water column. Geochemical analysis r

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44

Rosenthal, Lorne Richard Philip. "The stratigraphy, sedimentology and petrography of the Jurassic-Early Cretaceous clastic wedge in western Alberta." 1989. http://hdl.handle.net/1993/16928.

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45

Bridge, David Julian. "The deformed Early Jurassic Kerr copper-gold porphry deposit, sulphurets gold camp, Northwestern British Columbia." Thesis, 1993. http://hdl.handle.net/2429/4878.

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The Early Jurassic Kerr copper - gold porphyry deposit is hosted within a northerly striking, highly deformed and metamorphosed alteration zone in Late Triassic Stuhini Group sedimentary and volcanic rocks. Mineralization is related to west dipping calc-alkaline monzonite, syenodiorite (197 ± 3 Ma, U-Pb zircon) and K-Ba-feldspar megacrystic plagioclase hornblende porphyry (194 ± 1.5 Ma, U-Pb zircon) dykes. The Late Triassic sedimentary rocks exposed along the footwall form an east dipping, upright sequence of well bedded mudstone with conglomerate lenses overlain by conglomerate, sandsto

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46

Swientek, Oliver [Verfasser]. "The Greenland Norwegian Seaway : climatic and cyclic evolution of Late Jurassic-Early Cretaceous sediments / vorgelegt von Oliver Swientek." 2002. http://d-nb.info/965036944/34.

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Johannson, Gary G. "Provenance constraints on Early Jurassic evolution of the northern Stikinian arc : Laberge Group, Whitehorse Trough, northwestern British Columbia." Thesis, 1994. http://hdl.handle.net/2429/3524.

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The Lower to Middle Jurassic Inklin Formation forms part of the Laberge Group in northwestern B.C. which links the Stikine and Cache Creek terranes along much of the length of the Whitehorse Trough. Ammonite biochronology of the Inklin Formation in the Atlin Lake area constrain the age of the succession there to a range of Early Sinemurian to Late Pliensbachian and provide the temporal framework for analyzing petrofacies and interpreting basin history using paleocurrent data, ternary plots, and conglomerate clast age and provenance. Inklin Formation sediments record a complex arc-basin ev

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Hiebert, Franz Kunkel. "The role of bacteria in the deposition and early diagenesis of the Posidonienschiefer, a Jurassic oil shale in southern Germany." 1988. http://repositories.lib.utexas.edu/bitstream/handle/2152/6770/txu-oclc-19531066[1].pdf.

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Tafti, Reza. "Nature and origin of the early Jurassic copper (-gold) deposits at Minto and Williams Creek, Carmacks Copper Belt, Western Yukon : subtitle examples of deformed porphyry deposits." Thesis, 2005. http://hdl.handle.net/2429/16627.

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The Minto (~9 million tonnes; 1.73% Cu, 0.48 g/t Au, 7.5 g/t Ag) and Williams Creek (Carmacks Copper; ~15.5 million tonnes; 1.01% Cu, 0.42 g/t Au) deposits represent the most significant Cu(-Au) deposits discovered thus far within the Carmacks Copper Belt of western Yukon. The origin of the mineralization is controversial and several very different genetic models have previously been proposed for these deposits, including metamorphosed volcanic massive sulphide, metamorphosed redbed copper, or deformed porphyry-style mineralization. Mineralization consists of disseminations and stringer

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Hsieh, Pei-Shan, and 謝佩珊. "Geochronological, whole-rock elemental and Sr-Nd isotopic and apatite geochemical studies of Early Yanshanian (Jurassic) intrusives from Nanling Mountains area, South China and their tectonic implications." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/29509494171735610159.

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博士<br>國立臺灣大學<br>地質科學研究所<br>96<br>The widespread Mesozoic intrusives in South China were emplaced in three main periods: Triassic (Indosinian), Jurassic (Early Yanshanian) and Cretaceous (Late Yanshanian). Lithologically, granites predominate over basic and intermediate rocks, and volumetrically, Early Yanshanian granitoids are the most widely exposed in the Cathaysia Block (approximately 50% of the total surface area of Mesozoic granitoids). In this study, zircon U-Pb ages, whole-rock and apatite geochemical and Sr-Nd isotopic analyses were carried out to provide better constraints on the temp

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