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Geochemistry of Precambrian carbonates. V - Late Paleoproterozoic seawaterA 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.
Document ID
19920062098
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Veizer, Jan
(Ottawa, University Canada; Bochum, Ruhr-Universitaet, Federal Republic of Germany, United States)
Plumb, K. A.
(Bureau of Mineral Resources Geology and Geophysics, Canberra, Australia)
Clayton, R. N.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Hinton, R. W.
(Chicago, University IL, United States)
Grotzinger, J. P.
(MIT Cambridge, MA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 56
Issue: 6 Ju
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
92A44722
Funding Number(s)
CONTRACT_GRANT: NSF EAR-83-13579
CONTRACT_GRANT: NAG9-51
Distribution Limits
Public
Copyright
Other

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