Physics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1583l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 8, pp.1583-1591
Physics
7
Scientific paper
Amorphous kerogens from Phanerozoic sedimentary rocks may be divided into two groups on the basis of their 13 C values. h -amorphous kerogens have isotopic values in the range of -24 to -20 per mil, and l -amorphous kerogens have isotopic values in the range of -35 to -26 per mil. The occurrence of amorphous kerogens in the intermediate isotopic range from one rock unit in the data set suggests a weak continuum may exist between these two groups. Phytoplankton and, to a lesser extent, zooplankton and bacteria are considered to be the precursors for both kerogen types. A plausible explanation for this dichotomy may be found in the source of CO 2 utilized by phytoplankton, which is considered to be controlled by environmental factors. h -amorphous kerogens are expected to occur in silled basins that are overlain by expansive well-circulated deep (> 500 m) water, where the prevailing source of carbon in the photic zone is atmospheric-derived CO 2 . Conversely, l -amorphous kerogens are expected to occur in restricted basins that are overlain by stratified shallow (< 200 m) water, where the prevailing source of carbon in the photic zone may be organic-derived CO 2 .
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