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Effects of weathering on biological marker and aromatic hydrocarbon composition of organic matter in Phosphoria shale outcrop

Geochimica et Cosmochimica Acta

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Abstract

GC-MS analyses were performed on core samples collected from a shale outcrop of the Permian Phosphoria Formation in Utah, U.S.A., to study effects of weathering on selected biological marker and aromatic (phenanthrene) hydrocarbon compounds. Among the biological markers, the most important weathering effects are a decrease in the 20S 20R diastereomer ratio of the C29 steranes and loss of low molecular weight triaromatic steroids. A decrease in the C19 through C22 tricylcic terpanes occurs relative to the total C19-C26 tricyclic fraction. Pronounced loss of methyl-substituted phenanthrenes occurs relative to phenanthrene. No major effect on the overall distribution of pentacyclic terpanes is evident. ?? 1987.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of weathering on biological marker and aromatic hydrocarbon composition of organic matter in Phosphoria shale outcrop
Series title:
Geochimica et Cosmochimica Acta
Volume
51
Issue:
8
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochimica et Cosmochimica Acta
First page:
2153
Last page:
2157
Number of Pages:
5