Mathematics – Logic
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..859v&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, April 1989, p. 859-871. Research supported by NSERC, Australian Natio
Mathematics
Logic
15
Carbonaceous Rocks, Geochemistry, Geochronology, Precambrian Period, Sedimentary Rocks, Carbon Isotopes, Earth Mantle, Igneous Rocks, Oxygen Isotopes
Scientific paper
The mineralogical, chemical, and isotopic characteristics of sedimentary carbonates from Archean greenstone belts (including the Michipicoten Greenstone Belt, Canada; the Uchi Greenstone Belt, Canada; the 'Upper Greenstones', Zimbabwe; and the Older Schist Belt, India), and, thus of the Archean sea water, were investigated. The dominant carbonate lithology of the younger (about 2.8 Ga old) greenstones was found to be limestone, while the lithologies of the older (about 3.5 Ga old) greenstones and the iron formations of the greenstones of all ages, were ferroan dolomites and siderites. It is suggested that the mantlelike nature of the Sr-87/Sr-86 signal, the enrichment in Mn and Fe, and the depletion in O-18 found in greenstone belt carbonates are all consistent with the proposition that the Archean oceans were strongly influenced by a pervasive 'mantle' flux.
Hoefs Jochen
Lowe Donald R.
Thurston P. C.
Veizer Ján
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