Geochemistry of Precambrian carbonates - 3-shelf seas and non-marine environments of the Archean

Details Geochemistry of Precambrian carbonates - 3-shelf seas and non-marine environments of the Archean Geochemistry of Precambrian carbonates - 3-shelf seas and non-marine environments of the Archean

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2717v&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Oct. 1990, p. 2717-2729. Research supported by NSERC, Australian Nati

Mathematics

Logic

9

Carbonates, Geochemistry, Limestone, Lithology, Precambrian Period, Tectonics, Mineral Exploration, Mineralogy, Oxygen Isotopes, Trace Elements

Scientific paper

Samples from the Pangola and Ventersdorp Supergroups (Kaapvaal Craton, South Africa) and from the Fortescue and Hamersley Groups (Pilbara Block, Australia) were analyzed, using XRF, AAS, and isotope-analysis techniques to investigate the mineralogical, chemical, and isotopic features of these representatives of contemporary shelf carbonates (Pangola and Hamersley samples) and nonmarine carbonates (the Ventersdorp and Fortescue samples). Results show that, mineralogically, the shelf carbonates are almost exclusively dolostones, while the lacustrine facies are predominantly limestones. Geological, trace-element, and oxygen-isotope results of the shelf carbonates suggest that their original mineralogy may have been aragonite, and that the Pangola dolostones may represent a direct dolomitization product of this precursor. By contrast, the stabilization of the Hamersley carbonates may have involved an additional step of transformation of a metastable precursor into limestone.

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