Tetrapyrrole pigments in the geologic record

Conference · Tue Jan 01 04:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6438490

Louda, J W; Baker, E W

This paper is a synthesis of our ongoing studies on the fossilization of biotic tetrapyrrole pigments and is directed at revealing the utility of such study in assessing pre-, syn- and post-depositional processes. Diagenesis is found to become fated during oxic or anoxic deposition as to pigment destruction or fossilization, respectively. The progress of organic maturation has been followed in suited of oceanic sediments as well as shales and petroleum crudes from various basins in the US and Canada. Early catagenesis is witnessed by the release (ex kerogen.) of large quantities, re bitumen, of C28 to C34 V=O porphyrins. As catagenesis continues pigment concentration decreases, due to dilution, and higher C number porphyrins (C34-C45+) are added. Once the source is depleted or divorced from the bitumen, maturation leads to dealkylation which ends in the destruction of all tetrapyrrole structure. These changes are in concert with a shift from DPEP to ETIO dominance and parallel overall organic maturation in strict fashions. Organic source and paleoenvironment may also be addressed through porphyrin studies. Patterns of tetrapyrroles can differentiate the more allochthonous nature of black shale OM in the N. Atlantic from the autochthonous materials in these sequences in the margins of N.W. Africa and the S. Atlantic (high yield, DPEP).

• Research Organization: Florida Atlantic Univ., Boca Raton (USA)
• OSTI ID: 6438490
• Report Number(s): CONF-8510489-
• Conference Information: Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
• Country of Publication: United States
• Language: English

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02 PETROLEUM
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ATLANTIC OCEAN
BITUMENS
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CANADA
CARBONACEOUS MATERIALS
CATAGENESIS
CENOZOIC ERA
CHEMISTRY
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DIAGENESIS
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ORGANIC MATTER
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PETROLEUM DEPOSITS
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PIGMENTS
QUATERNARY PERIOD
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ROCKS
SEAS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SEDIMENTS
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