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Science 19 January 1990:
Vol. 247. no. 4940, pp. 309 - 312
DOI: 10.1126/science.247.4940.309
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Articles
Sedimentary 12-n-Propylcholestanes, Molecular Fossils Diagnostic of Marine Algae
J. Michael Moldowan 1,
Frederick J. Fago 1,
Cathy Y. Lee 1,
Stephen R. Jacobson 2,
David S. Watt 3,
Nacer-Eddine Slougui 3,
Alwarsamy Jeganathan 3, and
Donald C. Young 4
1 Chevron Oil Field Research Company, Post Office Box 1627, Richmond, CA 94802
2 Chevron Oil Field Research Company, Post Office Box 446, La Habra, CA 90633
3 Department of Chemistry, University of Kentucky, Lexington, KY 40506
4 Chevron Research Company, 576 Standard Avenue, Richmond, CA 94802
Certain C30-steranes have been used for identifying sedimentary rocks and crude oils derived from organic matter deposited in marine environments. Analysis of a C30-sterane from Prudhoe Bay oil indicates that these C30-steranes are 24-n-propylcholestanes that apparently are derived from precursor sterols 24-n-propylidene-cholesterols and 24-n-propylcholesterol. These widely occurring sterols are biochemically synthesized in modern oceans by members of an order (Sarcinochrysidales) of chrysophyte algae. These data thus imply that C30-sterane biomarkers in sedimentary rocks and crude oils have a marine origin. Screening of a few organic-rich sedimentary rocks and oils from throughout the Phanerozoic suggests that these C30-steranes first appeared and, therefore, their source algae evolved between Early Ordovician and Devonian.
Submitted on August 9, 1989
Accepted on November 1, 1989
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