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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Sm-Nd isotopic mapping of lithospheric growth and stabilization in the eastern Kaapvaal craton
Terra Nova, Volume 21, No. 3, Year 2009
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Description
Whole-rock Sm-Nd isotope systematics of 79 Archean granitoids from the eastern Kaapvaal craton, southern Africa, are used to delineate lithospheric boundaries and to constrain the timescale of crustal growth, assembly and geochemical differentiation c. 3.66-2.70 Ga. Offsets in εNd values for 3.2-3.3 Ga granitoids across the Barberton greenstone belt (BGB) are consistent with existing models for c. 3.23 Ga accretion of newly formed lithosphere north of the BGB onto pre-existing c. 3.66 Ga lithosphere south of the BGB along a doubly verging subduction margin. The Nd isotopic signature of c. 3.3-3.2 Ga magmatic rocks show that significant crustal growth occurred during subduction-accretion. After c. 3.2 Ga, however, the Nd signature of intrusive rocks c. 3.1 and 2.7 Ga is dominated by intracrustal recycling rather than by new additions from the mantle, signalling cratonic stability. © 2009 Blackwell Publishing Ltd.
Authors & Co-Authors
Schoene, R. Blair
United States, Cambridge
Massachusetts Institute of Technology
Dudas, F.
United States, Cambridge
Massachusetts Institute of Technology
Bowring, Samuel A.
South Africa, Cape Town
University of Cape Town
de Wit, Maarten J.
Switzerland, Geneva
Université de Genève
Statistics
Citations: 84
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1111/j.1365-3121.2009.00877.x
ISSN:
09544879
e-ISSN:
13653121