Mathematics – Logic
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2487v&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 6, June 1992, p. 2487-2501. Research supported by NSERC and Natio
Mathematics
Logic
11
Carbon Isotopes, Carbonates, Geochemistry, Oxygen Isotopes, Precambrian Period, Sea Water, Halites, Mineralogy, Strontium Isotopes, Sulfates
Scientific paper
A study of mineralogy, chemistry, and isotopic composition of the Coronation Supergroup (about 1.9 Ga, NWT), Canada, and the McArthur Group (about 1.65 NT), Australia, is reported in order to obtain better constrained data for the first- and second-order variations in the isotopic composition of late Paleoproterozoic (1.9 +/- 0.2 Ga) seawater. Petrologically, both carbonate sequences are mostly dolostones. The McArthur population contains more abundant textural features that attest to the former presence of sulfates and halite, and the facies investigated represent ancient equivalents of modern evaporitic sabkhas and lacustrine playa lakes. It is suggested that dolomitization was an early diagenetic event and that the O-18 depletion of the Archean to late Paleoproterozoic carbonates is not an artifact of postdepositional alteration.
Clayton Robert N.
Grotzinger John P.
Hinton Richard W.
Plumb K. A.
Veizer Ján
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