Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..901d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 46, Issue 6, pp.901-907
Physics
Scientific paper
Cretaceous black shales from DSDP Leg 41, Site 368 in the Eastern Atlantic Ocean were thermally altered during the Miocene by an intrusive basalt. The sediments overlying and underlying the intrusive body were subjected to high temperatures (up to ~ 500°C) and, as a result, their kerogen was significantly altered. The extent of this alteration has been determined by examination by means of 13 C nuclear magnetic resonance, using cross polarization/magic-angle spinning (CP/MAS). Results indicate that the kerogen becomes progressively more aromatic in the vicinity of the intrusive body. Laboratory heating experiments, simulating the thermal effects of the basaltic intrusion, produced similar results on unaltered shale from the drill core. The 13 C CP/MAS results appear to provide a good measure of thermal alteration.
Dennis Larry W.
Hatcher Patrick G.
Maciel Gary E.
Simoneit Bernd R. T.
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