Isotope and Organic Geochemistry of a Unique Proterozoic, Postglacial Succession: The Lapa Formation, Vazante Group, Brazil

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dc.contributor.advisorKaufman, Alan Jen_US
dc.contributor.authorBrody, Kristinaen_US
dc.contributor.departmentGeologyen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2007-06-22T05:39:02Z
dc.date.available2007-06-22T05:39:02Z
dc.date.issued2007-05-09
dc.description.abstractThis study is the second to investigate biological characteristics associated with Proterozoic glaciation via molecular fossils from organic matter preserved in shale. In the Vazante Group, Minas Gerais, Brazil, the Serra da Lapa Formation unconformably overlies a formation recently dated to ca. 1.13 Ga. Lithologic and isotopic data suggest the Lapa represents deposition immediately after either an early Neoproterozoic "snowball Earth" ice age or a possible regional, but still low-latitude, late Mesoproterozoic ice age. The relative abundances of biomarkers and other organic molecules show variations that match lithologic and isotopic changes observed in 40 meters of exploration drill core studied. Inconsistencies among biomarker abundances as well as differences between the organic matter of the Lapa Formation and that of the underlying formation hint at heterogeneity among and within formations. A more complete picture of the Vazante Group is warranted before characteristics of preserved organic matter can be interpreted in the context of depositional environments or postdepositional processes.en_US
dc.format.extent4947106 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/6986
dc.language.isoen_US
dc.subject.pqcontrolledGeochemistryen_US
dc.subject.pqcontrolledBiogeochemistryen_US
dc.subject.pqcontrolledGeologyen_US
dc.subject.pquncontrolledbiomarkersen_US
dc.subject.pquncontrolledglaciationen_US
dc.subject.pquncontrolledcarbon isotopesen_US
dc.subject.pquncontrolledsulfur isotopesen_US
dc.subject.pquncontrolledProterozoicen_US
dc.subject.pquncontrolledpetroleum geochemistryen_US
dc.titleIsotope and Organic Geochemistry of a Unique Proterozoic, Postglacial Succession: The Lapa Formation, Vazante Group, Brazilen_US
dc.typeThesisen_US

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