Mathematics – Logic
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl..98...74d&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 98, no. 1, April 1990, p. 74-89.
Mathematics
Logic
11
Earth Crust, Geological Surveys, Neodymium Isotopes, Rare Earth Elements, Samarium Isotopes, Africa, Chronology, Geochemistry, Geodynamics, Sedimentary Rocks
Scientific paper
The technique developed by Allegre and Rousseau (1984) for estimating a continental growth curve from measurements of isotopic Nd compositions and the Sm-147/Nd-144 ratios in shale samples was applied to 58 South African shales and greywackes with depositional ages ranging from 0.2 to 3.3 b.y. The results, together with data on other elements analyzed previously, are used to compute a growth curve for the continental crust in South Africa. Two periods of important crustal genesis, the Archaen and a period around 1.5 b.y., were compared with the observed geology and with continental crust growth curves obtained in previous studies in southern Africa and in Australia. On the basis of this comparison, it is proposed that the Archaen crust was composed of a granite (70.5 percent) and a mafic component (29.5 percent) which could have been komatiite.
Allègre Claude J.
Dia Aline
Erlank Anthony J.
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