| An Early Aged Ophiolite in the Western Kunlun Mts., NW Tibetan Plateau and Its Tectonic Implications |
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| 作者姓名： | XIAO Xuchang WANG Jun SU Li JI Wenhua and SONG Shuguang Institute of Geology Chinese Academy of Geological Sciences Beijing Geological Lab Center China University of Geosciences |
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| 基金项目： | 中国地质调查局勘测项目 |
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| 摘 要： | 1 Introduction The Kuda ophiolite occurred in the western Kunlun Mountains, which lies about the intersection of longitude 77°10′ E and latitude 36°45′ N (Figs. 1, 2). The upper portion of the ophiolite mainly consists of a thick layer of basaltic pillow lavas, which was well exposed along the high way from Xinjiang Uygur Autonomous Region to the western Tibetan Plateau, and the middle-lower part, the mafic-ultramafic cumulates and upper mantle rocks occur at the top of the mountain n…
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| 关 键 词： | 蛇纹岩 昆仑山 同位素 构造学 古生代 |
| 收稿时间： | 2005-04-20 |
| 修稿时间： | 2005-06-30 |
An Early Aged Ophiolite in the Western Kunlun Mts., NW Tibetan Plateau and Its Tectonic Implications |
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| Authors: | XIAO Xuchang WANG Jun SU Li JI Wenhua and SONG Shuguang Institute of Geology Chinese Academy of Geological Sciences Beijing Geological Lab Center China University of Geosciences |
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| Abstract: | Abstract 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 Mts., 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. |
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| Keywords: | Kuda ophiolite western Kunlun Mts SHRIMP U-Pb isotopic dating tectonics Neoproterozoic Early Paleozoic |
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