| 北祁连玉石沟蛇绿岩形成时代的上限——来自正长岩锆石U-Pb定年的证据 |
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| 引用本文： | 王国强,李向民,余吉远,唐卓,朱涛,潘峰,张越,卜涛.北祁连玉石沟蛇绿岩形成时代的上限——来自正长岩锆石U-Pb定年的证据[J].地质通报,2018,37(4):532-537. |
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| 作者姓名： | 王国强 李向民 余吉远 唐卓 朱涛 潘峰 张越 卜涛 |
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| 作者单位： | 中国地质调查局造山带地质研究中心/西安地质调查中心;国土资源部岩浆作用成矿与找矿重点实验室/西安地质调查中心 |
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| 基金项目： | 中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》（编号：DD20160012）和国家自然科学基金项目《甘肃北山泥盆纪高镁安山岩岩石成因及其地球动力学意义》（批准号：41703038） |
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| 摘 要： | 北祁连地区玉石沟蛇绿岩以发育较完整和典型的蛇绿岩岩石组合而备受关注。对侵入于玉石沟蛇绿岩中的正长岩进行LA-ICP-MS锆石U-Pb定年,获得正长岩的结晶年龄为522.7±5.3Ma,属早寒武世。这是北祁连地区最早的碱性侵入岩浆活动记录。该年龄的获得限定了玉石沟蛇绿岩形成时代的上限,应不晚于522Ma,即玉石沟蛇绿岩所代表的洋盆的发育扩张过程至少在该时限前已结束。
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| 关 键 词： | 玉石沟蛇绿岩 正长岩 LA-ICP-MS锆石U-Pb定年 北祁连 |
| 收稿时间： | 2017/7/7 0:00:00 |
| 修稿时间： | 2018/2/5 0:00:00 |
LA-ICP-MS zircon U-Pb dating of syenite from Yushigou in Northern Qilian Mountain |
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| WANG Guoqiang,LI Xiangmin,YU Jiyuan,TANG Zhuo,ZHU Tao,PAN Feng,ZHANG Yue and BU Tao.LA-ICP-MS zircon U-Pb dating of syenite from Yushigou in Northern Qilian Mountain[J].Geologcal Bulletin OF China,2018,37(4):532-537. |
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| Authors: | WANG Guoqiang LI Xiangmin YU Jiyuan TANG Zhuo ZHU Tao PAN Feng ZHANG Yue and BU Tao |
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| Institution: | Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China,Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China,Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China,Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China,Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China,Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China,Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China and Research Center for Orogenic Geology/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China;MLR Key Laboratory of Magmatic Ore Deposits Genetic Models and Exploration/Xi''an Center of Geological Survey, Geological Survey of China, Xi''an 710054, Shaanxi, China |
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| Abstract: | The Yushigou ophiolite in Northern Qilian Mountain, which has developed relatively complete and typical ophiolite rock association, has received widespread attention. The authors conducted the chronological study of zircons from the syenite by means of LA-ICP-MS U-Pb. The weighted mean age of the zircons is 522.7±5.3Ma, which belongs to the Early Cambrian and confirms the earliest record of alkaline intrusive magmatic activity in Northern Qilian Mountain. At the same time, this age gives a constraint that the upper limit of the age of Yushigou ophiolite should be no later than 522.7Ma. |
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| Keywords: | Yushigou ophiolite syenite LA-ICP-MS zircon U-Pb dating Northern Qilian Mountain |
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