Physics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1223p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 3, pp.1223-1230
Physics
1
Scientific paper
The aliphatic hydrocarbon fraction of an immature Monterey bitumen contains a high relative abundance of C 27 -C 29 4 , 5 , 8(14) 5 - and 14 5 -sterenes, each having a very similar carbon number distribution. This is the first report of abundant 8(14) 5 - and 14 5 - sterenes in an immature sediment. The 4 and 5 sterenes appear to originate directly from 5 sterols. For the 8(14) 5 - and 14 5 sterenes we propose an origin from 7 5 -sterols which may be derived from a microbial transformation of 5 sterols. The presence of 5 - and 5 -steranes in an unusual ratio of ca. 55:45 suggests the formation of a high abundance of 5 -stanols via the known microbial reduction pathway of 5 sterols.
de Leeuw Jan W.
Peakman Torren M.
Rijpstra Irene C. W.
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