Journal
PRECAMBRIAN RESEARCH
Volume 246, Issue -, Pages 150-159Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.precamres.2014.03.001
Keywords
Ultra-high temperature metamorphism; Magnesian charnockites; Zircon geochronology; Tectonics; Kaapvaal Craton
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SHRIMP U-Pb analysis of zircon grains from an ultrahigh temperature Mg-Al granulite from the northern margin of the Kaapvaal Craton (Southern Marginal Zone) shows ages of similar to 2.72 Ga for the peak metamorphism. Geochemical characteristics of syn-tectonic charnockites in the area are similar to magnesian charnockites, typically formed in subduction settings. In contrast to the prevailing models on peak metamorphism in the context of Neoarchean continent collision between Archean Zimbabwe and Kaapvaal cratons resulting in the formation of the Limpopo Complex, we relate the Neoarchean events to the accretion of this marginal block to the rest of the Kaapvaal Craton. In this model, the subduction event is marked by the formation of magnesian charnockites, and the ultrahigh temperature metamorphism dates the collision event. (C) 2014 Elsevier B.V. All rights reserved.
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