| The Early Paleozoic Tectonic Evolution of the West Kunlun Mountains：New Constraint from the North Kueda Pluton |
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| 摘 要： |
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| 关 键 词： | 地球化学特征 岩石发生学 地壳构造 古生代 火成岩 昆仑山 |
| 收稿时间： | 29 October 2008 |
The early Paleozoic tectonic evolution of the West Kunlun mountains: New Constraint from the North Küda Pluton |
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| Authors: | Chao Yuan Hui Zhou Min Sun Jiliang Li Quanli Hou |
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| Institution: | (1) Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Mailbox No. 17, No. 219 Ningliu Road, 210044 Nanjing, China;(2) Key Laboratory of Western China’s Environmental Systems, MOE, Lanzhou University, 730000 Lanzhou, China;(3) Research Institute of Environment and Resources, Hunan Normal University, 410081 Changsha, China;(4) College of Biology and Geography, Qinghai Normal University, 810008 Xining, China |
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| Abstract: | Systematic geochemical studies have been conducted on the North Küda Pluton, West Kunlun, in order to reveal its petrogenesis and tectonic implications. The North Küda Pluton is a potassium-rich (K2O>5.4wt% ) I-type granitic pluton and does not contain any alkaline ferromagnesian mineral. Its relatively high REE, LILE (e.g. Rb, Cs, U and Th) and HFSE (e. g. Nb, Zr) contents make it very akin to the A-type granites. Its heterogeneous Sr (87Sr/86Sri = 0.7049～0.7098) and Nd (εNdT= ?1.05～?4.04) isotope compositions preclude the possibility of a pure sedimentary or igneous source. Instead, its geochemical compositions suggest that it may be derived from partial melting of a complex source, which consists of igneous and sedimentary rocks. Its intraplate characteristics, together with coeval mafic dykes, indicate an extensional environment at the end of Caledonian. The recognition of the extensional event does not support a continuous subduction-accretion model for the Paleozoic tectonic evolution of the West Kunlun Mountains. On the contrary, it provides new evidence for the twostage island-arc model. |
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