Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1147r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 5, pp.1147-1152
Physics
3
Scientific paper
The degree of pyritisation (DOP) of Cambrian-Silurian normal marine shales is always less than 0.70, similar to that found previously for sediments of Devonian to Cretaceous ages. This indicates that DOP can be used as a paleoenvironmental indicator of deposition from normal marine ( i.e. , oxygenated) bottom waters throughout the Phanerozoic record. Although the range in DOP is similar, significant variations in normal marine C / S ratios can occur. Relatively low C / S ratios (<1) result from depositional or diagenetic conditions which give high reactive iron contents (which are positively correlated with increasing organic carbon concentrations), whereas higher C / S ratios (> 1.5) result from lower reactive iron contents (which are also independent of organic carbon variations). Reactive iron contents, and hence normal marine C / S ratios, are able to vary at a regional or basinal level.
Al-Biatty H. J.
Raiswell Rob
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