An Early Aged Ophiolite in the Western Kunlun Mts., NW Tibetan Plateau and Its Tectonic Implications

作     者：XIAO Xuchang WANG Jun SU Li JI Wenhua SONG Shuguang 

作者机构：Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 Geological Lab Center China University of Geosciences （Beijing） Beijing 100083 Xi＇an Institute of Geology Xi＇an Shanxi 710054 School of Earth and Space Sciences Peking University Beijing 100087 

出 版 物：《Acta Geologica Sinica(English Edition)》 (地质学报（英文版）)

年 卷 期：2005年第79卷第6期

页      面：778-786页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 

基　　金：This research is financially supported by China Geological Survey(Project No.2003 13000059) the Department of International Cooperation and Science and Technology,Ministry of Land and Resources(Project No.2001010205) the key project of the Ministry of Science and Technology(MOST)(Project No.2001CB711001) 

主　　题：Kuda ophiolite western Kunlun Mts. SHRIMP U-Pb isotopic dating tectonics Neoproterozoic Early Paleozoic 

摘      要：The early aged ophiolites have attracted attention of many geologists in recent decades, because the early aged ophiolites can provide the information about the ancient oceanic processes relevant to the evolution of plate tectonics in the early period of the earth, and also concern such problems as whether there existed a ＂Proto-Tethys＂ and the break-up and convergence of the Rodinian Supercontinent. This paper reveals a definite complete ophiolite of Neoproterozoic-Early Paleozoic, named Kuda ophiolite in the western Kunlun Mrs., NW Tibetan Plateau, and reports the recent reasonable SHRIMP zircon U-Pb ages of 510±4 Ma, and 502±13 Ma for the cumulates of the Kuda ophiolite, using the most powerful dating tool, the SHRIMP-Ⅱ. The geochemical and geochronology data integrating with the geological setting suggest that the Kuda ophiolite might have formed in an archipelago oceanic basin, not in a vast ocean, the so-called ＂Proto-Tethys＂, and was tectonically emplaced during the Early Paleozoic.