Ultrahigh temperature granulites and magnesian charnockites

Evidence for Neoarchean accretion along the northern margin of the Kaapvaal Craton

H. M. Rajesh, M. Santosh, Y. Wan, D. Liu, S. J. Liu, G. A. Belyanin

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

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 ~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.

Original languageEnglish
Pages (from-to)150-159
Number of pages10
JournalPrecambrian Research
Volume246
DOIs
Publication statusPublished - Jan 1 2014

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craton
accretion
metamorphism
Tectonics
subduction
collision
ultrahigh temperature metamorphism
temperature
granulite
Temperature
Archean
zircon
tectonics
analysis
continent

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

Cite this

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abstract = "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 ~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.",
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Ultrahigh temperature granulites and magnesian charnockites : Evidence for Neoarchean accretion along the northern margin of the Kaapvaal Craton. / Rajesh, H. M.; Santosh, M.; Wan, Y.; Liu, D.; Liu, S. J.; Belyanin, G. A.

In: Precambrian Research, Vol. 246, 01.01.2014, p. 150-159.

Research output: Contribution to journalArticle

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AU - Rajesh, H. M.

AU - Santosh, M.

AU - Wan, Y.

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AU - Belyanin, G. A.

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