A La-Icp-MS and Shrimp U/Pb Age Constraint on the Timing of Ree Mineralisation Associated With Bushveld Granites

Research Article| March 01, 2011 A LA-ICP-MS AND SHRIMP U/PB AGE CONSTRAINT ON THE TIMING OF REE MINERALISATION ASSOCIATED WITH BUSHVELD GRANITES I.S. BUICK; I.S. BUICK Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa. e-mail: buick@sun.ac.za Search for other works by this author on: GSW Google Scholar C. LANA; C. LANA Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa, e-mail: cristianodeclana@gmail.com. Present address: Departamento de Geologia, Universidade Federal de Ouro Preto, Morro Do Cruzeiro, Ouro Preto, Minas Gerais 35400000, Brazil. Search for other works by this author on: GSW Google Scholar C. GREGORY C. GREGORY Department of Applied Geology, Curtin University of Technology, GPO Box U1987 Perth, WA 6845, Australia. e-mail: C.Gregory@curtin.edu.au Search for other works by this author on: GSW Google Scholar South African Journal of Geology (2011) 114 (1): 1–14. https://doi.org/10.2113/gssajg.114.1.1 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation I.S. BUICK, C. LANA, C. GREGORY; A LA-ICP-MS AND SHRIMP U/PB AGE CONSTRAINT ON THE TIMING OF REE MINERALISATION ASSOCIATED WITH BUSHVELD GRANITES. South African Journal of Geology 2011;; 114 (1): 1–14. doi: https://doi.org/10.2113/gssajg.114.1.1 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 Monazite occurs in association with fluorite and polymetallic sulphides in brecciated pegmatites emplaced within discordant pipe-like structures, and spatially associated mineralised quartz veins that cut hydrothermally altered Bushveld-age Nebo Granite (Lebowa Granite Suite) on the farm Houtenbek 194 JR. Mineralisation of this style has been viewed as having a high-temperature origin related to a late-stage of Bushveld-age granite emplacement. However, early attempts to date Houtenbek monazite in the 1950 to 1960s, using thermal ionisation mass spectrometry, gave a range of very imprecise 207Pb/206Pb ages from isotopically moderately to strongly discordant grains that cannot be used to confidently make this link. Here we present new high spatial resolution SHRIMP and LA-ICP-MS weighted mean 207Pb/206Pb ages of 2059.2 ± 3.5 Ma and 2046 ± 10 Ma for a museum specimen of Houtenbek monazite. These estimates overlap with the 2054 Ma emplacement age of the main phase of the Lebowa Granite Suite. Together with the monazite REE patterns, which indicate a magmatic origin, the new age determinations reinforce the connection between REE mineralisation and Bushveld-age granites. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.