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The 132 Ma Comei-Bunbury large igneous province: Remnants identified in present-day southeastern Tibet and southwestern Australia

2009; Geological Society of America; Volume: 37; Issue: 7 Linguagem: Inglês

10.1130/g30001a.1

1943-2682

Di‐Cheng Zhu, Sun‐Lin Chung, Xuanxue Mo, Zhidan Zhao, Yaoling Niu, Biao Song, Yue‐Heng Yang,

earthquake and tectonic studies

Research Article| July 01, 2009 The 132 Ma Comei-Bunbury large igneous province: Remnants identified in present-day southeastern Tibet and southwestern Australia Di-Cheng Zhu; Di-Cheng Zhu * 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China *E-mail: dchengzhu@163.com; moxx38@yahoo.com. Search for other works by this author on: GSW Google Scholar Sun-Lin Chung; Sun-Lin Chung 2Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Search for other works by this author on: GSW Google Scholar Xuan-Xue Mo; Xuan-Xue Mo * 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China *E-mail: dchengzhu@163.com; moxx38@yahoo.com. Search for other works by this author on: GSW Google Scholar Zhi-Dan Zhao; Zhi-Dan Zhao 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Search for other works by this author on: GSW Google Scholar Yaoling Niu; Yaoling Niu 3Department of Earth Sciences, Durham University, Durham DH1 3LE, UK Search for other works by this author on: GSW Google Scholar Biao Song; Biao Song 4Beijing SHRIMP II Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Search for other works by this author on: GSW Google Scholar Yue-Heng Yang Yue-Heng Yang 5Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Search for other works by this author on: GSW Google Scholar Author and Article Information Di-Cheng Zhu * 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Sun-Lin Chung 2Department of Geosciences, National Taiwan University, Taipei 106, Taiwan Xuan-Xue Mo * 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Zhi-Dan Zhao 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China Yaoling Niu 3Department of Earth Sciences, Durham University, Durham DH1 3LE, UK Biao Song 4Beijing SHRIMP II Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Yue-Heng Yang 5Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China *E-mail: dchengzhu@163.com; moxx38@yahoo.com. Publisher: Geological Society of America Received: 05 Jan 2009 Revision Received: 29 Jan 2009 Accepted: 29 Jan 2009 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2009 Geological Society of America Geology (2009) 37 (7): 583–586. https://doi.org/10.1130/G30001A.1 Article history Received: 05 Jan 2009 Revision Received: 29 Jan 2009 Accepted: 29 Jan 2009 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Di-Cheng Zhu, Sun-Lin Chung, Xuan-Xue Mo, Zhi-Dan Zhao, Yaoling Niu, Biao Song, Yue-Heng Yang; The 132 Ma Comei-Bunbury large igneous province: Remnants identified in present-day southeastern Tibet and southwestern Australia. Geology 2009;; 37 (7): 583–586. doi: https://doi.org/10.1130/G30001A.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 SocietyGeology Search Advanced Search Abstract We report 11 new U-Pb zircon ages obtained by sensitive high-resolution ion microprobe (SHRIMP) and laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP–MS) for a large province of Early Cretaceous Comei igneous rocks consisting of basaltic lavas, mafic sills and dikes, and gabbroic intrusions together with subordinate layered ultramafic intrusions and silicic volcanic rocks exposed in the Tethyan Himalaya, southeastern Tibet. Available zircon U-Pb ages obtained from various rocks in this province, which has an areal extent of ~40,000 km2 (~270 km × 150 km), indicate that the magmatism occurred ca. 132 Ma ago, coeval with the Bunbury Basalt in southwestern Australia. Such a striking similarity in emplacement age, in combination with the tectonic reconstruction of eastern Gondwana ca. 132 Ma ago, allows us to propose that the extensive Comei igneous rocks in southeastern Tibet and the Bunbury Basalts in southwestern Australia may represent the erosional and/or deformational remnants of a large igneous province, which we call the Comei-Bunbury LIP. We argue that this newly identified LIP was likely caused by the Kerguelen mantle plume, which started in the Early Cretaceous and may have played a role in the breakup of eastern Gondwana and the development of the 132 Ma old Weissert oceanic anoxic event. 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