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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.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil./
Author:	Brody, Kristina Bartlett.
Description:	125 p.
Notes:	Adviser: Alan J. Kaufman.
Contained By:	Masters Abstracts International45-05.
Subject:	Biogeochemistry. -
Online resource:	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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005 20110512
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035 $a (UMI)AAI1443461
035 $a AAI1443461
040 $a UMI $c UMI
100 1 $a Brody, Kristina Bartlett. $3 1263152
245 1 0 $a Isotope and organic geochemistry of a unique Proterozoic, postglacial succession: The Lapa Formation, Vazante Group, Brazil.
300 $a 125 p.
500 $a Adviser: Alan J. Kaufman.
500 $a Source: Masters Abstracts International, Volume: 45-05, page: 2386.
502 $a Thesis (M.S.)--University of Maryland, College Park, 2007.
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.
590 $a School code: 0117.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Geology. $3 516570
650 4 $a Geochemistry. $3 539092
690 $a 0372
690 $a 0425
690 $a 0996
710 2 $a University of Maryland, College Park. $3 657686
773 0 $t Masters Abstracts International $g 45-05.
790 $a 0117
790 1 0 $a Kaufman, Alan J., $e advisor
791 $a M.S.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1443461