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South African Journal of Geology; June 2004; v. 107; no. 1-2; p. 219-232; DOI: 10.2113/107.1-2.219
© 2004 Geological Society of South Africa
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Article

Bushveld-age magmatism in southeastern Botswana: evidence from U-Pb zircon and titanite geochronology of the Moshaneng Complex

R.B.M. Mapeo and A. B. Kampunzu

University of Botswana, Private Bag 0022, Gaborone, Botswana., e-mails: mapeorbm{at}mopipi.ub.bw; kampunzu{at}mopipi.ub.bw

L.V. Ramokate

Geological Survey Department, Private Bag 14, Lobatse, Botswana., e-mail: lvramokate{at}gov.bw

F. Corfu

Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen’s Park, Toronto, M5S 2C6, Canada. University of Oslo, Geological Museum, P.B. 1172 Blindern, N-0318 Oslo, Norway e-mail: fernando.corfu{at}geologi.uio.no

R. M. Key

British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, Scotland. e-mail: rmk{at}exchange.edingurgh.bgs.ac.uk

The Moshaneng Complex (southeastern Botswana) consists of a suite of coarse-to-medium-grained gabbros, medium-grained diorites, alkali feldspar-phyric syenites, fine-grained and porphyritic granites. Field studies indicate commingling and mixing of mafic and felsic magmas leading to the production of diorites. U-Pb isotopic analyses of single zircon and titanite grains from the Moshaneng Complex granites yield a crystallisation age of 2054 ± 2 Ma, indicating the Moshaneng Complex is coeval with the Bushveld Complex of South Africa. The Bushveld-age ultramafic, mafic and felsic igneous rocks of southern Africa define a ~2.06 to ~2.05 Ga large igneous province extending from South Africa into Botswana.




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