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U-Pb zircon age of Cape Granite Suite ignimbrites: characteristics of the last phases of the Saldanian magmatism.

Department of Geology, University of Stellenbosch, Private BagX1, Matieland, 7602, South Africa, e-mail: rsc{at}land.sun.ac.za

M. Poujol

Economic Geology Research Institute-Hugh Allsopp Laboratory, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg, 2050, South Africa.

The end of the Saldanian magmatic event is marked by a short period of peraluminous silicic magmatism, evident as a series of ignimbrite flows, quartz porphyry and tuffisite intrusions. There is a close relationship between high-level granitic intrusions present as granite porphyries in the Langebaan area and the volcanic event. The subvolcanic-volcanic rocks under discussion ended the fourth and final phase of the Cape Granite Suite magmatism, thus starting and ending with a peraluminous phase. U-Pb ID-TIMS zircon age determinations on the second of three mappable ignimbrite flows yielded an age of 515.5 ± 3.1Ma. Two single zircon grains with ²⁰⁷Pb/ ²⁰⁶Pb ages of ~1875Ma and ~1575 Ma respectively are interpreted to represent xenocrysts extracted from older crust or from sedimentary contaminants.

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