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Evolution of the Kaapvaal Craton as viewed from geochemical and SmNd isotopic analyses of intracratonic pelites.pdf
Geochimica et Cosmochirnica Acta, Vol. 59, No. I I, pp. 2239-2258, 1995
Pergamon Copyright ~) 1995 Elsevier Science Ltd
Printed in the USA. All rights reserved
0016-7037/95 $9.50 + .00
0016-7037(95)00103-4
Evolution of the Kaapvaal Craton as viewed from geochemical and
Sm-Nd isotopic analyses of intracratonic pelites
B o R - M I N G JAHN t and KENTC. CONDIE2
~G6osciencesRennes (CNRS), Universit6de Rennes, 35042 Rennes Cedex, France
2Department of Geoscience,New Mexico Institute of Mining and Technology, Socorro,NM 87801, USA
(Received June 7, 1994;accepted in revisedform March 29, 1995)
Abstract--Precambrian cratonic pelites from the Kaapvaal Craton in southern Africa have similar REE
patterns with relative LREE enrichment and absence of significantdepletion in HREEs. They have a narrow
range of t47Sm/14nNdratios with a mean value of 0.118, which is identical to the mean value of ~450
worldwide fine-grained samples of all ages obtained by isotopic dilution analyses. This value is probably
the best estimate for the upper continental crust. The Kaapvaal pelites also have distinct Cr/Th ratios, but
over
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