Molecular parameters of maturation in the Toarcian shales, Paris Basin, France--IV. Laboratory thermal alteration studies

Details Molecular parameters of maturation in the Toarcian shales, Paris Basin, France--IV. Laboratory thermal alteration studies Molecular parameters of maturation in the Toarcian shales, Paris Basin, France--IV. Laboratory thermal alteration studies

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.2369m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 12, pp.2369-2376

Computer Science

4

Scientific paper

An immature Toarcian shale from the Paris Basin (Semecourt, reported maximum burial depth 700m) was heated in the laboratory under reduced pressure at different temperatures (201, 257, 285°C) for different times (6-91 days). We measured in the resulting extracts by gas chromatography or combined gas chromatography-mass spectrometry: 1. (a) extent of configuational isomerisation at (i) C-6 and C-10 in pristane, (ii) C-20, and C-14 and C-17 in 5 (H),14 (H),17 (H)-steranes, (iii) C-17 and C-22 in hopanes; 2. (b) extent of aromatisation in aromatic steroid hydrocarbons. Both configurational isomerisation and aromatisation occur during heating, but the latter process is accelerated relative to the former, in comparison with the maturation effect experienced by the Toarcian shales as a result of burial depth and the associated temperature rise. The results suggest that it may be possible to distinguish the thermal histories of sedimentary sequences by comparison of the relative extents of isomerisation at C-20 in steranes with the extent of aromatisation in aromatic steroid hydrocarbons.

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