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

Abstract

Research Article| June 01, 2002 U-Pb zircon age of Cape Granite Suite ignimbrites: characteristics of the last phases of the Saldanian magmatism. R. Scheepers; R. Scheepers Department of Geology, University of Stellenbosch, Private BagX1, Matieland, 7602, South Africa, e-mail: rsc@land.sun.ac.za Search for other works by this author on: GSW Google Scholar M. Poujol M. Poujol Economic Geology Research Institute-Hugh Allsopp Laboratory, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg, 2050, South Africa. Search for other works by this author on: GSW Google Scholar Author and Article Information R. Scheepers Department of Geology, University of Stellenbosch, Private BagX1, Matieland, 7602, South Africa, e-mail: rsc@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. Publisher: Geological Society of South Africa First Online: 07 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2002 Geological Society of South Africa South African Journal of Geology (2002) 105 (2): 163–178. https://doi.org/10.2113/105.2.163 Article history First Online: 07 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation R. Scheepers, M. Poujol; U-Pb zircon age of Cape Granite Suite ignimbrites: characteristics of the last phases of the Saldanian magmatism.. South African Journal of Geology 2002;; 105 (2): 163–178. doi: https://doi.org/10.2113/105.2.163 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySouth African Journal of Geology Search Advanced Search Abstract 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.