Computer Science
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1583w&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, July 1989, p. 1583-1595.
Computer Science
90
Chemical Evolution, Earth Mantle, Geochronology, Isotopes, Peridotite, Africa, Concentration (Composition), Lead Isotopes, Mass Spectrometers, Neodymium Isotopes, Osmium Isotopes, Strontium Isotopes, Trace Elements
Scientific paper
Isotope analyses of Os, Sr, Nd, and Pb elements were caried out on twelve peridotite xenoliths from the Jagersfontein, Letseng-la-terae, Thaba Patsoa, Mothae, and Premier kimberlites of southern Africa, to investigate the timing and the nature of melt extraction from the continental lithosphere and its relation to the continent formation and stabilization. The distinct Os and Pb isotopic characteristics found in these samples suggested that both the low- and the high-temperature peridotites reside in an ancient stable lithospheric 'keel' to the craton that has been isolated from chemical exchange with the sublithospheric mantle for time periods in excess of 2 Ga.
Boyd F. R.
Carlson Richard W.
Shirey Steven B.
Walker Ray J.
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