Дисертації з теми "Late Proterozoic"
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Phillips, Johnnie O. "Petrology of the Late Proterozoic(?) - Early Cambrian Arumbera Sandstone and the Late Proterozoic Quandong Conglomerate, East-central Amadeus Basin, Central Australia." DigitalCommons@USU, 1986. https://digitalcommons.usu.edu/etd/6684.
Повний текст джерелаTeitz, Martin W. "Late proterozoic Yellowhead and Astoria Carbonate Platforms, southwest of Jasper, Alberta." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63371.
Повний текст джерелаHaines, Peter W. "Carbonate shelf and basin sedimentation, late Proterozoic Wonoka Formation, South Australia /." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phh152.pdf.
Повний текст джерелаSmith, Peter B. "The alteration history of late Proterozoic Wooltana volcanics, Mount Painter Province, S.A. /." Adelaide, 1992. http://web4.library.adelaide.edu.au/theses/09SB/09sbs656.pdf.
Повний текст джерелаNational grid reference SH54 - 6737-2. One coloured folded map in pocket inside back pocket. Includes bibliographical references.
Kasolo, Pius Chilufya-Bwalya. "Fluid-channelling and gold mineralization within the Late Proterozoic Mwembeshi Shear Zone,Zambia." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315515.
Повний текст джерелаPoole, S. "The Late Proterozoic orogenic igneous activity of the Kadaweb area, Red Sea Hills, Sudan." Thesis, University of Portsmouth, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370180.
Повний текст джерелаHapugoda, Hapugoda Udage Sarath. "Late Archaean and Early Proterozoic crustal evolution of the Georgetown Block, Northeast Queensland, Australia /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16503.pdf.
Повний текст джерелаAndreasen, Kyle C. "Does the Southern Farmington Canyon Complex Record a late Archean/Early Proterozoic Accretionary Complex?" DigitalCommons@USU, 2007. https://digitalcommons.usu.edu/etd/6753.
Повний текст джерелаValentino, David W. "Tectonics of the lower Susquehhanna River region, southeastern Pennsylvania and northern Maryland: late proterozoic rifting to late paleozoic dextral transpression." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/30108.
Повний текст джерелаPimentel, Marcio Martins. "Late Proterozoic crustal evolution of the Tocantins Province in central Brazil : an isotopic and geochemical study." Thesis, University of Oxford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280038.
Повний текст джерелаThomas, Katherine S. S. M. Massachusetts Institute of Technology. "Stable isotope and organic biomarker analysis of the late Proterozoic Coppercap formation in the MacKenzie Mountains." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/114138.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (unnumbered pages 56-59).
Sulfur and carbon stable isotope ratios and organic biomarker abundance were performed on drill core samples from the Coppercap Formation of the Coates Lake Group in the Windermere Supergroup of the MacKenzie Mountains to reconstruct an environmental condition proceeding the first Neoproterozoic Snowball Earth event. The Coppercap Formation directly underlies the Rapitan Group, Sturtian glacigenic deposits, and represents a depositional environment existing directly before the Cryogenian glacial episodes. Based on aryl isoprenoids, n-propyl cholestane, isopropyl cholestane, total organic carbon, carbonate mineral analysis, [delta]34S from pyrite, [delta]13Corganic and [delta]13Ccarbonate values, environmental conditions of the Coppercap Formation were reconstructed. The Coppercap Formation was found to be a shallow euxinic marine basin with purple and green sulfur bacteria microbial mats. This suggest persistent hydrogen sulfide rich waters in the shallow photic zone persisted until the Sturtian.
by Katherine S. Thomas.
S.B.
Jacob, Jana. "Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/8742.
Повний текст джерелаNamibia's south western coast, the Sperrgebiet, hosts one of the world's largest diamond placer deposits. Diamond distribution in this placer deposit is directly related to the presence of a diamond-carrying gravel, the degree of reworking of the gravel and the quantity and quality of the diamond trapsites. The diamond-carrying gravel is present in the form of palaeo-beaches. Six Plio-Pleistocene beaches have been identified lying onshore between the Orange River mouth and Chameis Bay. The Plio-Pleistocene beaches are underlain by Late Proterozoic footwall. The Late-Proterozoic footwall has undergone extensive marine erosion and development of marine platforms during different sea-level stillstands. Diamond trapsites in the form of potholes and gullies are incised into palaeo platforms formed during the sea-level stillstands. The marine erosion palaeo-platforms have been cut into the predominantly siliciclastic rocks of the Gariep Belt. The Late Proterozoic Gariep Belt is divided into an eastern para- aulochthonous passive continental margin zone, the Port Nolloth Zone, and a western allochthonous Marmora Terrane. Previous work suggested that the Marmora Terrane had been thrust on top of the Port Nolloth Zone in a south-easterly direction and that the Marmora Terrane could be subdivided into three tectonostratigraphic units: the Schakalsberge Complex, the Oranjemund Complex and the Chameis Complex. In addition, previous work indicated that the Oranjemund Complex had been stacked tectonically between the Chameis Complex in the northwest and the Schakalsberge Complex in the southeast. However, this study questions the subdivision of the Marmora Terrane into three separate tectonic complexes. The rocks in the study area forms part of the newly defined Oranjemund Group, Oranjemund Sub-terrane.
Leaver, Julie. "The petrological and geochemical evolution of the Late Proterozoic Lithospheric mantle below Seiland Province northern Norway." Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296735.
Повний текст джерелаRoots, Charles F. (Charles Frederick) Carleton University Dissertation Geology. "Regional tectonic setting and evolution of the late proterozoic Mount Harper volcanic complex, Ogilvie Mountains, Yukon." Ottawa, 1987.
Знайти повний текст джерелаCooper, Andrew McGregor. "Late Proterozoic hydrocarbon potential and its association with diapirism in Blinman #2, Central Flinders Ranges, South Australia /." Title page, abstract and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09SB/09sbc776.pdf.
Повний текст джерела"National grid reference 1:250 000 - Parachilna SH54-13." Includes bibliographical references (leaves 45-47).
Starling, Antony. "Tectonic and chemical evolution of a late Proterozoic gold deposit, Gebeit Mine, Northern Red Sea Hills, Sudan." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358662.
Повний текст джерелаChandonais, Daniel. "Deformation and Fluid History of Late Proterozoic and Early Cambrian Rocks of the Central Appalachian Blue Ridge." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1343055132.
Повний текст джерелаPearce, Andrew M. "Carbon and oxygen isotopic compositions of some late Proterozoic and early Cambrian carbonates in the southern Adelaide geosyncline /." Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09S.B/09s.bp359.pdf.
Повний текст джерела"National grid reference: Noarlunga SI (54-4) 6627 IV Cassini SI (53-16) 6326 I Stokes Bay SI (53-16) 6326 IV." Includes bibliographical references.
Simpson, Edward L. "Sedimentology and tectonic implications of the Late Proterozoic to Early Cambrian Chilhowee Group in southern and central Virginia." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53660.
Повний текст джерелаPh. D.
Hamp, Lonn P. "Petrology of the Late Proterozoic(?)-Early Cambrian Arumbera Sandstone, Western MacDonnell Ranges, North-Central Amadeus Basin, Central Australia." DigitalCommons@USU, 1985. https://digitalcommons.usu.edu/etd/6679.
Повний текст джерелаVon, Veh Mark Wolter. "The stratigraphy and structural evolution of the late Proterozoic Gariep belt in the Sendelingsdrif-Annisfontein area, northwestern Cape Province." Doctoral thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/17695.
Повний текст джерелаA geological investigation of the Port Nolloth metasediments in the central external parts of the Gariep Beit has led to a re-interpretation of tbeir lithostratigraphy and Pan-African geotectonic evolution. During the rifting stage of passive continental margin evolution, the basal elastic Stinkfontein Sequence was deposited in an alluvial fan environment. Fluviatile conglomerates and quartz arenites (Lekkersing Formation) interfinger with feldspathic arenites and minor volcanics (Vredefontein Formation), and prograde into marginal marine elastics and carbonates (Gumchavib Formation). Rift faulting produced local grabens into which massflow sediments (Kaigas Formation) and volcaniclastics (Rosh Pinah Formation) were shed. During the sea-floor spreading stage, a shallow-water carbonateclastic unit, the Hilda Sequence, was deposited. Conglomerates, quartzites, and schists with resedimented gravity-flow characteristics (Wallekraal Formation) are sandwiched between lower and upper platform carbonates (Pickelhaube and Dabie River Formations). The Hilda is unconformably overlain by the Numees Sequence, consisting of a widespread glaciogenic diamictite (Sendelingsdrif Formation) and a near-basal banded iron formation (Jakkalsberg Formation). A deep-water elastic unit, the Holgat Sequence, was laid down during the early stage of the lower Nama transgression.
Kathol, Benno. "Evolution of the rifted and subducted Late Proterozoic to Early Paleozoic Baltoscandian margin in the Torneträsk section, northern Swedish Caledonides." Doctoral thesis, Stockholms universitet, Institutionen för geologiska vetenskaper, 1989. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-81676.
Повний текст джерелаBriner, Andreas. "The anatomy of a late proterozoic continental margin at mid-crustal level: the crystalline basement of Salalah, Dhofar region, Sultanate of Oman /." [S.l.] : [s.n.], 1997. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Повний текст джерелаJansyn, Joanne. "Strato-tectonic evolution of a large subsidence structure associated with the late Proterozoic Wonoka Formation at Wilpena Pound, central Flinders Ranges, South Australia /." Title page, table of contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09SB/09sbj35.pdf.
Повний текст джерелаOne col. map + one col. chart in pocket. National grid reference : Parachilna sheet H54-13 (1:250 000). Includes bibliographical references.
Koeksoy, Elif [Verfasser], and Andreas [Akademischer Betreuer] Kappler. "Biogeochemical Fe-S-cycling in a late Archean and Proterozoic ocean model habitat - the high alpine Arvadi Spring / Elif Koeksoy ; Betreuer: Andreas Kappler." Tübingen : Universitätsbibliothek Tübingen, 2018. http://d-nb.info/1198973374/34.
Повний текст джерелаTemperley, Stephen. "The late Proterozoic to early Palaeozoic geological development of the Glen Banchor area in the Monadhliath Mountains of Scotland : with particular reference to deformation in late-Precambrian shear zones and in the Central Highland steep belt." Thesis, University of Hull, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293171.
Повний текст джерелаUrlwin, Ben. "Carbon isotope stratigraphy of the late Proterozoic Wonoka formation of the Adelaide fold belt : diagenetic assessment and interpretation of isotopic signature and correlations with previously measured isotopic curves /." Title page, abstract and contents only, 1992. http://web4.library.adelaide.edu.au/theses/09SB/09sbu77.pdf.
Повний текст джерелаOn title page : "National Grid reference : Copley 1:250,000 SH54-9 6636." Folded map in back cover pocket. Includes bibliographical references (leaves [50-65]).
Ayliffe, Damien. "Geological setting of the late Proterozoic Wonoka Formation carbonate ramp and canyon sequence at Pichi Ric hi Pass Southern Flinders Ranges, South Australia : geoch emical, stable isotope, and diagenetic analysis /." Title page, contents and abstract only, 1992. http://web4.library.adelaide.edu.au/theses/09S.B/09s.ba978.pdf.
Повний текст джерелаOn title page: "National Grid reference: Port Augusta sheet SI 53-4 (1:250000) Onnoroo sheet SI 54-1 (1:250 00 0)." One map in pocket inside back cover. Includes bibliographical references (leaves 52-60).
Piercey, Patricia. "PROTEROZOIC METAMORPHIC GEOCHRONOLOGY OF THE DEFORMED SOUTHERN PROVINCE, NORTHERN LAKE HURON REGION, CANADA." Ohio University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1149204676.
Повний текст джерелаDelpomdor, Franck. "Sedimentology, geochemistry and depositional environments of the 1175-570 Ma carbonate series, Sankuru-Mbuji-Mayi-Lomami-Lovoy and Bas-Congo basins, Democratic Republic of Congo: new insights into late Mesoproterozoic and Neoproterozoic glacially- and/or tectonically-influenced sedimentary systems in equatorial Africa." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209486.
Повний текст джерелаwas an enigmatic period characterized by the development of the first stable long-lived ~1.1-
0.9 Ga Rodinia and 550-500 Ma Gondwana supercontinents, global-scale orogenic belts,
extreme climatic changes (cf. Snowball Earth Hypothesis), the development of microbial
organisms facilitating the oxidizing atmosphere and explosion of eukaryotic forms toward the
first animals in the terminal Proterozoic. This thesis presents a multidisciplinary study of two
Neoproterozoic basins, i.e. Bas-Congo and Sankuru-Mbuji-Mayi-Lomami-Lovoy, in and around the Congo Craton including sedimentology, geochemistry, diagenesis, chemostratigraphy and radiometric dating of carbonate deposits themselves.
The Mbuji-Mayi Supergroup sequence deposited in a SE-NW trending 1500 m-thick siliciclastic-carbonate intracratonic failed-rift basin, extends from the northern Katanga Province towards the centre of the Congo River Basin. The 1000 m-thick carbonate succession is related to the evolution of a marine ramp submitted to evaporation, with ‘deep’ shaly basinal and low-energy carbonate outer-ramp environments, marine biohermal midramp (MF6) and ‘very shallow’ restricted tide-dominated lagoonal inner-ramp (MF7-MF9) settings overlain by lacustrine (MF10) and sabkha (MF11) environments, periodically
submitted to a river water source with a possible freshwater-influence. The sequence stratigraphy shows that the sedimentation is cyclic in the inner ramp with plurimetric ‘thin’ peritidal cycles (± 4 m on average) recording a relative sea level of a maximum of 4 m, with fluctuations in the range of 1-4 m. The outer/mid ramp subtidal facies are also cyclic with ‘thick’ subtidal cycles characterized by an average thickness of ± 17 m, with a probable sealevel
fluctuations around 10 to 20 m. The geochemistry approach, including isotopic and major/trace and REE+Y data, allows to infer the nature of the dolomitization processes operating in each carbonate subgroup, i.e dolomitization may be attributed to evaporative reflux of groundwater or to mixing zones of freshwater lenses. The latest alteration processes occured during the uplift of the SMLL Basin. New ages, including LA-ICP-MS U-Pb laser ablation data on detrital zircon grains retrieved in the lower arenaceous-pelitic sequence (BI group), combined with carbon and strontium isotopic analyses, yielded a new depositional time frame of the Mbuji-Mayi Supergroup between 1176 and 800 Ma reinforcing the formerly suggested correlation with the Roan Group in the Katanga Province.
In the Democratic Republic of Congo, the Sturtian-Marinoan interglacial period was previously related to pre-glacial carbonate-dominated shallow marine sedimentation of the Haut-Shiloango Subgroup with stromatolitic reefs at the transition between greenhouse (warm) and icehouse (cold) climate periods, commonly marked by worldwide glacigenic diamictites and cap carbonates. This thesis highlights that these deposists record as a deepening-upward evolution from storm-influenced facies in mid- and outer-ramps to deepwater environments, with emplacement of mass flow deposits in toe-of-slope settings controlled by synsedimentary faults. In absence of diagnostic glacial features, the marinoan Upper Diamictite Formation is interpreted as a continuous sediment gravity flow deposition along carbonate platform-margin slopes, which occurred along tectonically active continental margins locally influenced by altitude glaciers, developed after a rift–drift transition. The maximum depth of the deepening-upward facies is observed in the C2a member. The
shallowing-upward facies exibit a return of distally calcareous tempestites and semi-restricted to restricted peritidal carbonates associated with shallow lagoonal subtidal and intertidal zones submitted to detrital fluxes in the upper C2b to C3b members.
The geochemistry highlights (i) the existence of a δ13C-depth gradient of shallow-water and deep-water carbonates; (ii) the carbonate systems were deposited in oxic to suboxic conditions; and (iii) all samples have uniform flat non-marine shale-normalized REE+Y distributions reflecting
continental detrital inputs in nearshore environments, or that the nearshore sediments were
reworked from ’shallow’ inner to mid-ramp settings in deep-water slope and outer-ramp
environments, during the rift-drift transition in the basin. The pre-, syn- and post-glacial
carbonate systems could record a distally short-lived regional synrift freshwater-influenced
submarine fan derived from nearshore sediments, including gravity flow structures, which are
attributed to regional tectonic processes due to a sudden deepening of the basin caused by
differential tilting and uplifting of blocks, related to the 750-670 Ma oceanic spreading of the
central-southern Macaúbas Basin.
Combining sedimentology, isotopes and trace elemental geochemistry, the thesis highlights
that the δ13C variations in the Neoproterozoic carbonates are complex to interpret, and can be
related to: (i) the existence of a δ13C-depth gradient; (ii) the exchange between isotopically
light carbon in meteoric waters and carbonate during lithification and early diagenesis; and
(iii) isotopic perturbations due to regional metamorphism. Considering the possible englaciation of the Earth (Snowball Earth hypothesis), the Mbuji-Mayi Supergroup and West
Congolian Group seem reflected the intimate relationship between glaciations and tectonic
activity during the break-up of the Rodinia supercontinent, followed by the rift–drift
transition, and finally the pre-orogenic period on the passive continental margin.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Chubb, Peter T. A. "Petrogenesis of the Eastern portion of the Early Proterozoic East Bull Lake gabbro-anorthosite intrusion, district of Sudbury/Algoma, Ontario." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1994. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ46471.pdf.
Повний текст джерелаHabib, Shanif Sadrydin. "The petrology and geochemistry of Proterozoic ultrapotassic, diamond-bearing lamprophyre dikes of the Gibson-MacQuoid Lake Belt, District of Keewatin, Northwest Territories." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0030/MQ30724.pdf.
Повний текст джерелаRiegler, Thomas. "Système d'altération et minéralisation en uranium le long du faisceau structural Kiggavik-Andrew Lake (Nunavut, Canada) : modèle génétique et guides d'exploration." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2313/document.
Повний текст джерелаThis work presents a multi-scale study of the relationships between alteration and uranium mineralization along the South Eastern margin of the Meso-Proterozoic Thelon Basin, Nunavut, Canada. The ore associated alterations are hosted in an Archean volcano-sedimentary sequence belonging to the Woodburn Lake Group (WLG). Their main expression is a mineral assemblage composed of dominant illite (1Mcis & 1Mtrans polytypes) together with sudoite ± hematite and aluminum phosphate sulfate minerals. Moreover carbonaceous materials cogenetic with the uranium mineralization have been identified as potential indicators of the hydrothermal conditions. At a regional scale, alteration is strongly controlled via East-West faults forming the main frame of the Kiggavik-Andrew Lake structural trend. Then from the regional to the mineral scale, alterations signatures at Kiggavik are similar to the ones described in deep basement rocks of unconformity type uranium deposits in both Athabasca (Canada) and Kombolgie (Australia) Paleoproterozoic basins. In addition mineralogical markers studies (APS minerals) lead to the distinction between hydrothermal and diagenetic processes as well as elemental transfers during fluid rock interaction. Finally, detailed studies on radiation induced defects on illite revealed new ways to tracing and better understanding the radio elements mobility in such deep seated natural systems
Haines, Peter W. "Carbonate shelf and basin sedimentation, late Proterozoic Wonoka Formation, South Australia." Thesis, 1987. http://hdl.handle.net/2440/21574.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, Dept. of Geology and Geophysics, 1987
Smith, P. B. "The alteration history of Late Proterozoic Wooltana Volcanics, Mount Painter Province, S.A." Thesis, 1992. http://hdl.handle.net/2440/131151.
Повний текст джерелаThe Wooltana Volcanics experienced a pervasive low grade hydrothermal alteration prior to the Delamerian. The timing of this event is poorly constrained. However the available evidence is consistent with the metasomatism occurring during the active stretching thought to have caused the uplift related refrigeration responsible for the formation of the Merinjina Tillite. This study confirms the proposals of previous workers that the Wooltana Volcanics, Beda Volcanics and Gairdner Dyke Swarm are temporal equivalents, although this study has shown the Gairdner Dyke Swann to be a systematically fractionated end member. The Wooltana Volcanics are very like the Parana low-Ti CFB of Brazil and also the dolerites from the Atlas Mountains of Morocco. Both are associated with magmatic events immediately preceding the first openings of the Atlantic Ocean. The occurrence of the Port Pirie Volcanics within Burra Group sediments suggests a reoccurrence of mantle decompression due to lithospheric stretching further to the south.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1992
Gueneli, Nur. "Late Mesoproterozoic Microbial Communities." Phd thesis, 2016. http://hdl.handle.net/1885/109340.
Повний текст джерелаHoffe, Brian H. "Deep seismic evidence of late middle Proterozoic rifting beneath the Kalahari, Western Botswana /." 1996. http://collections.mun.ca/u?/theses,35598.
Повний текст джерелаZang, Wenlong. "An analysis of late Proterozoic - early Cambrian microfossils and biostratigraphy in China and Australia." Phd thesis, 1988. http://hdl.handle.net/1885/140928.
Повний текст джерелаBrem, Arjan Gerben. "The Late Proterozoic to Palaeozoic Tectonic Evolution of the Long Range Mountains in Southwestern Newfoundland." Thesis, 2007. http://hdl.handle.net/10012/2748.
Повний текст джерелаKukla, Peter Alfred. "Tectonics and sedimentation of a late proterozoic Damaran convergent continental margin, Khomas Hochland, central Namibia." Thesis, 1990. https://hdl.handle.net/10539/26381.
Повний текст джерелаThe Late Proterozoic Damara Oroqen (750-450 Ma} in Namibia forms part of the Pan-African mobile belt system which dissects southern Africa. The Khomas Trough in the inland branch of the orogen comprises thick multiply deformed metagraywackes and pelites of the Kuisab Formation. (Abbreviation abstract).
Andrew Chakane 2019
Wang, Shih-chung, and 王世忠. "The geological significance and Ar datings of the late Proterozoic - early Paleozoic metamorphic rocks in Fujian area." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/99615616988385222967.
Повний текст джерелаLemon, Nicholas M. "Diapir recognition and modelling with examples from the late proterozoic Adelaide Geosyncline, Central Flinders Ranges, South Australia." Thesis, 1988. http://hdl.handle.net/2440/18825.
Повний текст джерелаLemon, Nicholas M. "Diapir recognition and modelling with examples from the late proterozoic Adelaide Geosyncline, Central Flinders Ranges, South Australia / Nicholas M. Lemon." 1988. http://hdl.handle.net/2440/18825.
Повний текст джерелаTitle page, contents and abstract only. The complete thesis in print form is available from the University Library.
Thesis (Ph.D.)--University of Adelaide, Dept. of Geology and Geophysics, 1988
Meredith, K. "Geological history of the Waukarie Creek canyon complex, southern Flinders Ranges, South Australia." Thesis, 1997. http://hdl.handle.net/2440/131148.
Повний текст джерелаMany regional disconformities or 'sequence boundaries' have now been identified throughout the late Proterozoic Wilpena sediments of the Adelaide Geosyncline, South Australia. The most prominent of these appears near the base of the Wonoka Formation and has been related to the formation of incised valleys or 'canyons'. Early interpretations of these canyons suggested they were of submarine origin, cut and filled in a deepwater environment. However, more recent work has focused on a subaerial model whereby the incisions were cut fluvially. Work was carried out on the Waukarie Creek Canyon Complex in the Southern Flinders Ranges. Observations gained from field mapping tend to favour a subaerial origin for canyon development. Some localities were found that provide evidence that there was some tectonic activity, expressed by deformation of sediments, prior to the formation of the Wonoka canyons. Palaeocurrents from flute casts and current ripples show that numerous reversals were found throughout the canyon, substantiating a tectonic influence on the formation of the canyons. This activity may be approximately coeval with the Beardmore Orogeny of Antarctica. The compressional Cambro-Ordovician Delamerian Orogeny subsequently deformed the sedimentary prism in a complex array of north-south trending tight folds and reverse faults.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1997
Jansyn, J. "Strato-tectonic evolution of a large subsidence structure associated with the late Proterozoic Wonoka Formation at Wilpena Pound, central Flinders Ranges, South Australia." Thesis, 1990. http://hdl.handle.net/2440/86719.
Повний текст джерелаThe coincidence between the timing of the subsidence of a trough-like structure adjacent to Wilpena Pound and the initiation of canyons associated with the late Proterozoic Wonoka Formation in other parts of the Flinders Ranges provides circumstantial but not necessarily compelling evidence for a tectonic control being involved with the formation of the canyons. The trough, here termed The Wilpena Trough, is characterised by the presence of a deep central sag and shoulder sags bounded by steep north-easterly trending faults. Other canyons may have marginal faults; and the numerous reversals of current indicators within them, rather than simple unidirectional current trends as expected with turbidite erosion, substantiate a tectonic influence in their generation. Small scale faulting in the Wearing Dolomite Member of the Wonoka Formation reflects the dominantly extensional regime in which the Wilpena Trough was formed. A phase of warping prior to deposition of the Wonoka Formation may have provided the necessary trigger to produce stress zones in strata, where growth faults controlling the sedimentation in the Wilpena Trough were initiated. After deposition of the Wearing Dolomite Member in a shallow water palaeoenvironment, Units 2 and 3 of the Wonoka Formation were deposited in deeper water settings on a shelfal slope. This idea supports a submarine environment prior to subsidence of the Trough. Measured stratigraphic thickness changes give a precise timing for the initiation of fault movement that caused thickened packages of sediments. Major fault movement and corresponding sediment subsidence became active near the Unit 2/Unit 3 transition and dominated the deposition of Unit 3 through to Unit 7. Units 4 to 9 represent a wedge of prograding shelf sediments. Unit 10 is a shallow transgressional sequence and a sequence boundary has been proposed of the base of this unit, due to the marked change in sedimentary style. Stable carbon and oxygen isotope data from the sediments of the Wonoka Formation in the central Flinders Ranges shows an initial low negative plot which is succeeded by an interval showing a strong negative excursion which then makes a shift back to low negative values. A possible correlation between the late Proterozoic units in the Adelaide Fold Belt and the eastern Officer Basin enables the data from the Wonoka Formation to be added to information which Pell (1989) obtained from the Rodda Beds to show a continuous trend from the negative excursion to a broad positive one. Comparison with the corresponding overseas data provides a potential tool for late Proterozoic inter-regional basin correlation.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1990
Ayliffe, D. "Geological setting of the Late Proterozoic Wonoka Formation at Pichi Richi Pass, southern Flinders Ranges, South Australia: geochemical, stable isotope and diagenetic analysis." Thesis, 1992. http://hdl.handle.net/2440/131142.
Повний текст джерелаCarbon, oxygen and strontium isotope stratigraphy has increased the resolution of Proterozoic stratigraphic correlation. Isotopic analysis was performed on the late Proterozoic Wonoka Formation canyon and carbonate platform sequences. Highly depleted and homogenised carbon and oxygen isotopes characterise the canyon fill (13C = -8 to -7%o, (18O = - 17 to -15%o PDB ) whilst a major positive excursion was observed in the Wonoka Formation carbonate platform sequence ((13C = -8 to -0.5%o, (18O = -15.0 to -7.0%o PDB). These values correlate closely with other established isotopic trends throughout the Adelaide Geosyncline. However, similar aged late Vendian strata throughout the world show low positive values. Strontium isotopic analysis revealed relatively 87Sr enrichment in the carbonate platform deposits compared to the canyon sequence. This was attributed to the input of 87Sr enriched terrestrially derived strontium. The 87Sr/86Sr ratio of the Wonoka Formation correlates closely with established late Proterozoic seawater trends. Therefore, a primary strontium isotopic composition is implied for the Wonoka Formation. Major and trace element geochemical analysis (Ca, Mg, Sr, Fe, Mn, and Rb) was performed to assess the diagenetic alteration of the late Proterozoic strata. Samples with low Mn/Sr, high Ca/Sr, high strontium, and low rubidium have the highest probability of preserving a primary geochemical signal. Most samples from the Pichi Richi region analysed plotted under the altered Mn/Sr (<2) and Ca/Sr (<2000) values. The high remnant strontium-concentrations of the Wonoka Formation suggest neomorphism from an aragonitic precursor. Micritic carbonate of the Wonoka Formation was probably a primary marine precipitate of aragonite derived from late Proterozoic supersaturated seas. Therefore, the majority of sediment diagenesis probably occurred in the marine phreatic zone, resulting in the observed primary isotopic composition.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1992
Urlwin, B. "Carbon isotope stratigraphy of the Late Proterozoic Wonoka Formation of the Adelaide Fold Belt: diagenetic assessment and interpretation of isotopic signature and correlations with previously measured isotopic curves." Thesis, 1992. http://hdl.handle.net/2440/105305.
Повний текст джерелаThe Wonoka Formation of the Adelaide Fold Belt represents the only well described example of a late Proterozoic storm dominated carbonate shelf sequence with the considerable thickness and lateral extent of the formation making it an excellent opportunity for applying the principles of isotope stratigraphy. Sequences exposed at Warraweena, which lies on the boundary between the Central and Northern Flinders Zones, were analysed for stable isotope ratios of carbon and oxygen. Geochemical, petrographic and cathodoluminescent analysis of individual samples was used to identify those carbonates which have experienced significant diagenetic alteration. These values were not included in the interpretation of the formation's isotopic signal. Plotting of the least altered values against stratigraphic height revealed a consistent carbon isotopic trend. This trend was divided into two sections, termed the Lower Wonoka Signal and the Upper Wonoka Signal. The Lower Wonoka Signal is defined by the extremely consistent negative signal (delta13c = -8 to -7o/oo) characteristic of the lower- to mid-Wonoka Formation. This signal is interpreted to be a product of deposition and lithification in basinal waters that contain anomalously light dissolved carbonate. The Upper Wonoka Signal comprises a shift to more positive values (a13c = -5 to +6 o/oo) and is interpreted to be a reflection of carbonate deposition in shallow surface waters, possibly in association with the formation of a partially restricted lagoon. Strontium isotopic analysis reveals 87Sr/86Sr values that are interpreted to be of primary origin. These values, when compared to data obtained by previous authors for the equivalent time period, give an estimated age of 560-590 Ma for the Wonoka Formation.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 1992
Dolozi, Michael B. "Physical volcanology of the Early Proterozoic Bear Lake mafic metavolcanic succession, Flin Flon, Manitoba." 1988. http://hdl.handle.net/1993/6875.
Повний текст джерелаWadien, Rita. "Mineralogical and chemical characteristics of hydrothermal alteration associated with the Proterozoic Vamp Lake Cu-Zn sulfide deposit, Flin Flon area." 1993. http://hdl.handle.net/1993/7347.
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