Other
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..973w&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, April 1987, p. 973-984.
Other
3
Geochemistry, Geochronology, Isotopes, Silicon Compounds, Neodymium, Republic Of South Africa, Rubidium, Samarium, Strontium
Scientific paper
An Rb-Sr and Sm-Nd isotopic analysis of Archean chert samples from the Onverwacht Group, South Africa is presented, showing the same characteristic Rb and Sr concentrations as Phanerozoic cherts, with a very large range of Rb-87/Sr-86 ratios. A good correlation line in the Rb-87 to Sr-87 evolution diagram, corresponding to an age of about 2119 My and an initial Sr-87/Sr-86 ratio of about 0.72246, is derived which may be interpreted as reflecting the age of rehomogenization of the Sr in the protolith and the recrystallization of these cherts due to circulating hydrothermal fluids during regional metamorphism about 1.4 AE after deposition of the Onverwacht Group. The Sm-Nd systematics reflect an ancient source age of about 3.5 AE.
Wasserburg Gerald J.
Weis Dominique
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