Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Mendonidis, P. Articles by Thomas, R.J. Search for Related Content GeoRef GeoRef Citation

Metamorphic history and U-Pb Zircon (SHRIMP) geochronology of the Glenmore Granite: Implications for the tectonic evolution of the Natal Metamorphic Province

Department of Metallurgical Engineering, Vaal Triangle Technikon, P/Bag X021, Vanderbijlpark, 1900. e-mail: peter{at}tritek.ac.za

R.A. Armstrong

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

B.M. Eglington and G.H. Grantham

Council for Geoscience, P/Bag X112, Pretoria, 0001, e-mail: grantham{at}geoscience.org.za

R.J. Thomas

British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, U.K. e-mail: bthomas{at}bgs.ac.uk

A new SHRIMP U-Pb zircon age of 1091 ± 9 Ma has been acquired for the gneissic, S-type Glenmore Granite from the Margate Terrane of the Natal Metamorphic Province. The Glenmore Granite contains two foliations and mineral textures indicate it underwent two metamorphic episodes separated by a period of retrogression. The presence of a folded S₁ foliation in the Glenmore Granite indicates that it was either pre- or syntectonic relative to D₁, thus providing a maximum age constraint of 1091 ± 9 Ma on the D₁ event in the Margate Terrane. This is ~60 Ma later than the completion of the main tectonism (D_1–3) documented from the Tugela Terrane, suggesting diachronous arc accretion. Syntectonic granitoids with ages of ~1090 Ma have also been documented from the Mzumbe terrane, as well as from Western Dronning Maud Land (east Antarctica), and the Cape Meredith Complex in the Falklands, which on reconstruction of Gondwanaland, lie adjacent to the Natal Metamorphic Province.

This article has been cited by other articles:

				D. H. Cornell and R. J. Thomas Age and tectonic significance of the Banana Beach Gneiss, KwaZulu-Natal South Coast, South Africa South African Journal of Geology, September 1, 2006; 109(3): 335 - 340. [Abstract] [Full Text] [PDF]

				R. J. Thomas, R. J. Thomas, R. A. Armstrong, and B. M. Eglington Geochronology of the Sikombe Granite, Transkei, Natal Metamorphic Province, South Africa South African Journal of Geology, December 1, 2003; 106(4): 403 - 408. [Abstract] [Full Text] [PDF]