Primary and diagenetic controls of isotopic compositions of iron-formation carbonates

Details Primary and diagenetic controls of isotopic compositions of iron-formation carbonates Primary and diagenetic controls of isotopic compositions of iron-formation carbonates

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3461k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Dec. 1990, p. 3461-3473.

Mathematics

Logic

12

Carbon Isotopes, Carbonates, Geochemistry, Iron Compounds, Isotopes, Mineralogy, Australia, Oxygen Isotopes, Structural Basins, Temperature Gradients

Scientific paper

Results are presented on parallel analyses of carbonate and chert microbands in segments from the early Proterozoic Dales Gorge Member of the Brockman Iron Formation (western Australia), including data on isotopic, chemical, and mineralogic variations in microbanded carbonates, cherts, and coexisting minerals in four core segments from Paraburdoo and one from Wittenoom. It is shown that patterns of variation observed in isotopic abundance and mineral composition can be consistently explained in terms of diagenetic replacement of fine-grained primary precipitates by secondary ones, rather than by mineral-dependent fractionations, metamorphism, or the influence of large volumes of water in an open system.

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