The 132 Ma Comei-Bunbury Large Igneous Province: Remnants Identifi Ed in Present-Day Southeastern Tibet and Southwestern Australia
The 132 Ma Comei-Bunbury large igneous province: Remnants identifi ed in present-day southeastern Tibet and southwestern Australia Di-Cheng Zhu1*, Sun-Lin Chung2, Xuan-Xue Mo1*, Zhi-Dan Zhao1, Yaoling Niu3, Biao Song4, and Yue-Heng Yang5 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China 2Department of Geosciences, National Taiwan University, Taipei 106, Taiwan 3Department of Earth Sciences, Durham University, Durham DH1 3LE, UK 4Beijing SHRIMP II Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China 5Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ABSTRACT and Cona areas; Fig. 1B) of southern Tibet. The We report 11 new U-Pb zircon ages obtained by sensitive high-resolution ion microprobe new data obtained in this study together with (SHRIMP) and laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP–MS) fi eld observations and consideration in a global for a large province of Early Cretaceous Comei igneous rocks consisting of basaltic lavas, context further suggest that the rocks in south- mafi c sills and dikes, and gabbroic intrusions together with subordinate layered ultramafi c eastern Tibet and the Bunbury Basalt in south- intrusions and silicic volcanic rocks exposed in the Tethyan Himalaya, southeastern Tibet. western Australia are temporally related and Available zircon U-Pb ages obtained from various rocks in this province, which has an areal constitute the erosional and/or deformational extent of ~40,000 km2 (~270 km × 150 km), indicate that the magmatism occurred ca. 132 Ma remnants of a large igneous province, which ago, coeval with the Bunbury Basalt in southwestern Australia.
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