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Geology; March 2000; v. 28; no. 3; p. 251-254; DOI: 10.1130/0091-7613(2000)28<251:TPIOFL>2.0.CO;2
© 2000 Geological Society of America
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Tetracyclic polyprenoids: Indicators of freshwater (lacustrine) algal input

Albert G. Holba1, Erik Tegelaar*,1, Leroy Ellis*,1, M. S. Singletary*,1 and Pierre Albrecht*,2

1 ARCO Exploration and Production Technology, Plano, Texas 75075, USA
2 Laboratoire de Géochimie Organique, Institut de Chimie, Université Louis Pasteur, 1 rue Blaise Pascal, 67000 Strasbourg, France

Because of the great variety of lacustrine-source depositional characteristics and biological consortia, identification of a universally applicable indicator of freshwater or brackish-water organic input for crude oils and rock extracts has proven elusive. Tetracyclic polyprenoid compounds (TPP) are present in relatively high concentrations in oils and associated source rocks deposited under freshwater or brackish-water conditions, but typically are present in relatively low concentrations in samples from marine or coal-forming depositional environments. A TPP ratio, constructed from the gas chromatography–tandem mass spectrometry peak areas of a C30 tetracyclic polyprenoid divided by the sum of the peak areas of the C26 27-norcholestanes, revealed great specificity in identifying freshwater or brackish-water algal input, particularly in crude oils.

Key Words: lacustrine • TPP ratio • tetracyclic polyprenoid • 24-propylcholestane • 4-methylsterane • depositional environment




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