Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 2. U-Pb zircon geochronology and tectonic model

Research Article| September 01, 2015 Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 2. U-Pb zircon geochronology and tectonic model Samuel Wai-Pan Ng; Samuel Wai-Pan Ng 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK †Current address: Department of Earth Sciences, The University of Hong Kong, Pok Fu Lam Road, Pok Fu Lam, Hong Kong; waipanng@hku.hk. Search for other works by this author on: GSW Google Scholar Martin J. Whitehouse; Martin J. Whitehouse 2Swedish Museum of Natural History, and Nordic Center for Earth Evolution, Box 50007, SE-104 05 Stockholm, Sweden Search for other works by this author on: GSW Google Scholar Michael P. Searle; Michael P. Searle 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Search for other works by this author on: GSW Google Scholar Laurence J. Robb; Laurence J. Robb 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Search for other works by this author on: GSW Google Scholar Azman A. Ghani; Azman A. Ghani 3Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia Search for other works by this author on: GSW Google Scholar Sun-Lin Chung; Sun-Lin Chung 4Institute of Earth Sciences, Academia Sinica, Taipei 10529, Taiwan5Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan Search for other works by this author on: GSW Google Scholar Grahame J.H. Oliver; Grahame J.H. Oliver 6Department of Geography, National University of Singapore, Singapore 117570 Search for other works by this author on: GSW Google Scholar Masatoshi Sone; Masatoshi Sone 3Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia Search for other works by this author on: GSW Google Scholar Nicholas J. Gardiner; Nicholas J. Gardiner 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Search for other works by this author on: GSW Google Scholar Muhammad H. Roselee Muhammad H. Roselee 3Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia Search for other works by this author on: GSW Google Scholar Author and Article Information Samuel Wai-Pan Ng †Current address: Department of Earth Sciences, The University of Hong Kong, Pok Fu Lam Road, Pok Fu Lam, Hong Kong; waipanng@hku.hk. 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Martin J. Whitehouse 2Swedish Museum of Natural History, and Nordic Center for Earth Evolution, Box 50007, SE-104 05 Stockholm, Sweden Michael P. Searle 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Laurence J. Robb 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Azman A. Ghani 3Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia Sun-Lin Chung 4Institute of Earth Sciences, Academia Sinica, Taipei 10529, Taiwan5Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan Grahame J.H. Oliver 6Department of Geography, National University of Singapore, Singapore 117570 Masatoshi Sone 3Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia Nicholas J. Gardiner 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK Muhammad H. Roselee 3Department of Geology, University of Malaya, 50603 Kuala Lumpur, Malaysia Publisher: Geological Society of America Received: 29 Sep 2014 Revision Received: 18 Dec 2014 Accepted: 17 Feb 2015 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2015 Geological Society of America GSA Bulletin (2015) 127 (9-10): 1238–1258. https://doi.org/10.1130/B31214.1 Article history Received: 29 Sep 2014 Revision Received: 18 Dec 2014 Accepted: 17 Feb 2015 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Samuel Wai-Pan Ng, Martin J. Whitehouse, Michael P. Searle, Laurence J. Robb, Azman A. Ghani, Sun-Lin Chung, Grahame J.H. Oliver, Masatoshi Sone, Nicholas J. Gardiner, Muhammad H. Roselee; Petrogenesis of Malaysian granitoids in the Southeast Asian tin belt: Part 2. U-Pb zircon geochronology and tectonic model. GSA Bulletin 2015;; 127 (9-10): 1238–1258. doi: https://doi.org/10.1130/B31214.1 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 SocietyGSA Bulletin Search Advanced Search Abstract In our complementary geochemical study (Part 1), the Malaysian granitoids of the Southeast Asian tin belt were divided into a Middle Permian to Late Triassic I-type–dominated Eastern province (Indochina terrane) and a Triassic to Early Jurassic transitional I/S-type Main Range province (Sibumasu terrane), separated by the Bentong-Raub suture zone which closed in the Late Triassic. Previous geochronology has relied on only a few U-Pb zircon ages together with K-Ar and whole rock Rb-Sr ages that may not accurately record true magmatic ages. We present 39 new high-precision U-Pb zircon ion microprobe ages from granitoids and volcanics across the Malay Peninsula. Our results show that ages from the Eastern province granitoids span 289–220 Ma, with those from the Main Range province granitoids being entirely Late Triassic, spanning 227–201 Ma. A general westerly younging magmatic trend across the Malay Peninsula is considered to reflect steepening and roll-back of the Bentong-Raub subduction zone during progressive closure of Paleo-Tethys. The youngest ages of subduction-related granites in the Eastern province roughly coincide with the youngest ages of marine sedimentary rocks along the Paleo-Tethyan suture zone. Our petrogenetic and U-Pb zircon age data support models that relate the Eastern province granites to pre-collisional Andean-type magmatism and the western Main Range province granites to syn- and post-collisional crustal melting of Sibumasu crust during the Late Triassic. Tin mineralization was mainly associated with the latter phase of magmatism. Two alternative tectonic models are discussed to explain the Triassic evolution of the Malay Peninsula. The first involves a second Late Triassic to Jurassic or Early Cretaceous east-dipping subduction zone west of Sibumasu where subduction-related hornblende and biotite–bearing granites along Sibumasu are paired with Main Range crustal-melt tin-bearing granites, analogous to the Bolivia Cordilleran tin-bearing granite belt. The second model involves westward underthrusting of Indochina beneath the West Malaya Main Range province, resulting in crustal thickening and formation of tin-bearing granites of the Main Ranges. Cretaceous granitoids are also present locally in Singapore (Ubin diorite), on Tioman Island, in the Noring pluton, of the Stong complex (Eastern Province), and along the Sibumasu terrane in southwest Thailand and Burma (Myanmar), reflecting localized crustal melting. 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