Computer Science
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2001p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.2001-2009
Computer Science
2
Scientific paper
Series of (20 R )- and (20 S )- 8 (14) and 14 5 ( H )-sterenes have been identified in an immature marl from a hypersaline deposit (northern Apennines, Italy) by co-injection studies with authentic compounds. These alkenes co-occur with 13 (17) 5 (H)-spirosterenes and transient (20 R )- and (20 S )- 14 5 ( H ), 17 (H)-sterenes. The source of these isomeric steroid alkenes is probably 7 (and 8(14) ) 5 (H)sterols via ( 2,7 ), 2,8(14) and 2,14 5 ( H )-steradienes. Reduction processes in the sediment, via the 14 5 (H),17 (H)-sterenes, can give rise to the C-20 isomeric 5 (H),14 (H),17 (H)-steranes present in "anomalously" high relative abundances from a thermal maturity viewpoint. This diagenetic pathway is supported by laboratory rearrangement/hydrogenation experiments of 5 (H)-cholest-7-ene and from considerations of carbon number distributions of various steroid hydrocarbons in the sediment extract.
de Leeuw Jan W.
Maxwell James R.
Peakman Torren M.
Rechka J. R.
ten Haven H. L.
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