Carbon and oxygen isotope variations in precambrian cherts

Details Carbon and oxygen isotope variations in precambrian cherts Carbon and oxygen isotope variations in precambrian cherts

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1473r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 6, pp.1473-1478

Mathematics

Logic

7

Scientific paper

Isotopic compositions of O in bulk Precambrian cherts and of C in the insoluble organic matter trapped in the silica have been determined. A general negative correlation relates these two variables and indicates that postdepositional alteration may have markedly modified the pristine isotopic ratios of the C compounds and their hosts. This interpretation is in good agreement with the expected isotopic trends for C and O resulting from secondary geological thermal events. Based on this correlation, a maximum 13 C value of ca . - 33%./ PDB is proposed for the Precambrian kerogen. The difference between Proterozoic and Phanerozoic (-27%.) 13 C values could be linked to the flowering of life at the end of the Precambrian.

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