Geochemistry of Precambrian carbonates. I - Archean hydrothermal systems

Details Geochemistry of Precambrian carbonates. I - Archean hydrothermal systems Geochemistry of Precambrian carbonates. I - Archean hydrothermal systems

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..845v&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, April 1989, p. 845-857. Research supported by NSERC, Australian Natio

Mathematics

Logic

4

Carbonaceous Rocks, Geochemistry, Precambrian Period, Earth Planetary Structure, Geochronology, Mineralogy, Planetary Evolution

Scientific paper

Carbonate rocks from the Superior Province and the Slave Province of Canada, Kaapvaal Craton of South Africa, and the Pilbara Block of Australia were characterized mineralogically, isotopically, and chemically. Result on the bulk chemical composition suggest that the carbonate rocks originated by massive carbonatization, silicification, and sericitization via replacement and/or filling of void spaces of intermediate to ultramafic protoliths. Trace element chemistry of carbonates was found to be consistent with their precipitation from relatively low-salinity solutions and with the derivation of solutes from the contemporaneous volcano-sedimentary piles. On the basis of mineralogy and the chemical and isotopic findings, it is suggested that the carbonate component defines two partially overlapping populations, a ferroan dolomite-breunnerite series restricted mostly to extensive faults and shear zones, and a calcite-ferroan dolomite-siderite population associated with alteration halos of a larger regional extent.

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