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Journal of the Geological Society; 2009; v. 166; issue.5; p. 827-830;
DOI: 10.1144/0016-76492008-148
© 2009 Geological Society of London

Special

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

H. Mouri1, M.J. Whitehouse2, G. Brandl3 & H.M. Rajesh1

1 Department of Geology, University of Johannesburg, Johannesburg 2006, South Africa
2 Laboratory for Isotope Geology, Swedish Museum of Natural History, SE-10405 Stockholm, Sweden
3 Council for Geoscience, Limpopo Unit, Polokwane, South Africa

*Corresponding author (e-mail: hmouri{at}uj.ac.za)

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 207Pb/206Pb age of 3344 ± 3.6 Ma, representing the protolith age. The unzoned overgrowths yielded four discrete groups with weighted mean 207Pb/206Pb 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.

Supplementary material: Analytical methods and data are available at http://www.geolsoc.org.uk/SUP18368.