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New U-Pb data on zircons from the Amalia greenstone belt Southern Africa: insights into the Neoarchaean evolution of the Kaapvaal Craton

Economic Geology Research Institute, Private Bag 3, University of the Witwatersrand, WITS 2050, South Africa Inco Innovation Centre, Memorial University of Newfoundland, 300 Prince Philip Drive, St. John’s, NL, Canada A1B 3X5, e-mail: mpoujol{at}esd.mun.ca

R. Kiefer

CAMEG, Department of Geology, Private Bag 3, University of the Witwatersrand, WITS 2050, South Africa, e-mail: rob{at}msaprojects.co.za

L.J. Robb and C.R. Anhaeusser

Economic Geology Research Institute, Private Bag 3, University of the Witwatersrand, WITS 2050, South Africa, e-mail: robblj{at}geosciences.wits.ac.za; anhaeusserc{at}geosciences.wits.ac.za

R.A. Armstrong

Research School for Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia, e-mail: richard.armstrong{at}anu.edu.au

Evidence for the existence of Neoarchaean greenstone rocks in the western part of the Kaapvaal Craton is provided by ID-TIMS and SHRIMP U-Pb age data on zircons from supracrustal rocks of the Amalia greenstone belt. Although all the units described from the Amalia greenstone belt might not be coeval, an age of 2750.1 ± 4.6 Ma found for two samples appears to be the best estimate for the deposition of this part of the Amalia greenstone belt sequence. These samples also contain younger zircons, the majority of them yielding a 1099 ± 32 Ma upper intercept age. This date of ~ 1.1 Ga might indicate that these rocks have been affected by the crustal thickening and magmatism event coeval with the peak of metamorphism during the Namaqua orogeny ~1.1 Ga. These data provide the first evidence for the development of a Neoarchaean greenstone sequence in the western part of the Kaapvaal Craton. They also demonstrate that the Namaqua orogeny affected rocks within the craton itself.

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