Computer Science
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1709m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 11, pp.1709-1721
Computer Science
20
Scientific paper
The changes in configuration at a number of chiral centres in certain acyclic isoprenoid alkanes, steranes, rearranged steranes and triterpanes of the hopane type in a suite of fourteen Toarcian shales (Paris Basin) have been determined by gas chromatography and combined gas chromatography-mass spectrometry. A sequence of changes in the ratios of various stereoisomers occurs both with increasing maximum depth of burial and in a North-South direction for shallow samples (maximum burial depth < 1000m). These changes cover the full range of maturity shown by the samples. The presence of 5 (H), 14 (H), 17 (H)-steranes in immature samples indicates the presence of a reworked component. The extent of epimerisation at a number of the chiral centres suggests that it relates to the extent of steric hindrance at the centres.
Durand Bernice
MacKenzie Andrew S.
Maxwell James R.
Patience R. L.
Vandenbroucke Maxence
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