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Biological marker distribution in coexisting kerogen, bitumen and asphaltenes in Monterey Formation diatomite, CaliforniaOrganic-rich (18.2%) Monterey Formation diatomite from California was studied. The organic matter consist of 94% bitumen and 6% kerogen. Biological markers from the bitumen and from pyrolysates of the coexisting asphaltenes and kerogen were analyzed in order to elucidate the relationship between the various fractions of the organic matter. While 17 alpha(H), 18 alpha(H), 21 alpha(H)-28,30-bisnorhopane was present in the bitumen and in the pryolysate of the asphaltenes, it was not detected in the pyrolysates of the kerogen. A C40-isoprenoid with "head to head" linkage, however, was present in pyrolysates of both kerogen and asphaltenes, but not in the bitumen from the diatomite. The maturation level of the bitumen, based on the extent of isomerization of steranes and hopanes, was that of a mature oil, whereas the pyrolysate from the kerogen showed a considerably lower maturation level. These relationships indicate that the bitumen may not be indigenous to the diatomite and that it is a mature oil that migrated into the rock. We consider the possibility, however, that some of the 28,30-bisnorhopane-rich Monterey Formation oils have not been generated through thermal degradation of kerogen, but have been expelled from the source rock at an early stage of diagenesis.
Document ID
20040089350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tannenbaum, E.
(Institute of Geophyics and Planetary Physics, University of California Los Angeles 90024, United States)
Ruth, E.
Huizinga, B. J.
Kaplan, I. R.
Date Acquired
August 21, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Organic geochemistry
Volume: 10
Issue: 1-3 Pt 1
ISSN: 0146-6380
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NGR05007-221
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Exobiology

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