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Isotope and organic geochemistry of ...

Brody, Kristina Bartlett.

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Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil./
作者:	Brody, Kristina Bartlett.
面頁冊數:	125 p.
附註:	Adviser: Alan J. Kaufman.
Contained By:	Masters Abstracts International45-05.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1443461

Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil.
Brody, Kristina Bartlett.

Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil. - 125 p.

Adviser: Alan J. Kaufman.

Thesis (M.S.)--University of Maryland, College Park, 2007.

This 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.Subjects--Topical Terms:

545717
Biogeochemistry.

Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil.
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520 $a This 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.
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