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

January 1, 1987

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 20S20R">20S20R 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.

Publication Year 1987
Title Effects of weathering on biological marker and aromatic hydrocarbon composition of organic matter in Phosphoria shale outcrop
DOI 10.1016/0016-7037(87)90264-X
Authors J. L. Clayton, J. D. King
Publication Type Article
Publication Subtype Journal Article
Series Title Geochimica et Cosmochimica Acta
Index ID 70014156
Record Source USGS Publications Warehouse