A magmatic age and four successive metamorphic events recorded in zircons from a single meta-anorthosite sample in the Central Zone of the Limpopo Belt, South Africa

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Author list: Mouri H, Whitehouse MJ, Brandl G, Rajesh HM

Publisher: The Geological Society

Place: BATH

Publication year: 2009

Journal: Journal of the Geological Society (0016-7649)

Journal acronym: J GEOL SOC LONDON

Volume number: 166

Start page: 827

End page: 830

Number of pages: 4

ISSN: 0016-7649

eISSN: 2041-479X

Languages: English-Great Britain (EN-GB)

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Abstract

Ion microprobe U-Th-Pb analyses combined with cathodoluminescence imaging of zircons from a meta-anorthosite from the Central Zone of the Limpopo Belt record five distinct events. The most concordant ages of cores of zircon yielded a weighted mean Pb-207/Pb-206 age of 3344 +/- 3.6 Ma, representing the protolith age. The unzoned overgrowths yielded four discrete groups with weighted mean Pb-207/Pb-206 ages of 3150 +/- 15 Ma, 2614 +/- 4 Ma, 2488 +/- 22 Ma and 2009 +/- 28 Ma, representing four possible metamorphic events in the Central zone. This is the first time that a succession of several metamorphic events has been demonstrated in a single rock-type from the Limpopo Belt.

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