| 阿尼玛卿蛇绿岩带花岗—英云闪长岩锆石U—Pb同位素定年及大地构造意义 |
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| 引用本文： | 边千韬 李涤徽. 阿尼玛卿蛇绿岩带花岗—英云闪长岩锆石U—Pb同位素定年及大地构造意义[J]. 地质科学, 1999, 34(4): 420-426 |
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| 作者姓名： | 边千韬 李涤徽 |
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| 作者单位： | 1. 中国科学院地质研究所, 北京100029;2. 中国科学院科学出版社, 北京100717 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 对阿尼玛卿蛇绿岩带布青山段花岗—英云闪长岩进行的锆石U—Pb同位素定年及岩石化学研究表明,该岩体锆石U—Pb年龄为402±24Ma,归属加里东末期,并非二叠-三叠纪同造山岩浆活动的产物;岩石属钙碱系列,具岛弧花岗岩特征,暗示着本区在早古生代发生过洋壳俯冲及岛弧岩浆活动事件,并为本区早古生代蛇绿岩的存在提供了佐证。
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| 关 键 词： | 阿尼玛卿蛇绿岩带 布青山段 花岗—英云闪长岩 加里东末期 岛弧岩浆作用 |
| 收稿时间： | 1999-03-05 |
| 修稿时间： | 1999-03-05; |
ZIRCON U-Pb AGE OF GRANODIORITE-TONALITE IN THE A'NYEMAQEN OPHIOLITIC BELT AND ITS TECTONIC SIGNIFICANCE |
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| Bian Qiantao Luo Xiaoquan Chen Haihong Zhao Dasheng. ZIRCON U-Pb AGE OF GRANODIORITE-TONALITE IN THE A'NYEMAQEN OPHIOLITIC BELT AND ITS TECTONIC SIGNIFICANCE[J]. Chinese Journal of Geology, 1999, 34(4): 420-426 |
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| Authors: | Bian Qiantao Luo Xiaoquan Chen Haihong Zhao Dasheng |
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| Affiliation: | 1. Institute of Geology, Chinese Academy of Sciences, Beijing 100029;2. Science Press, Chinese Academy of Sciences, Beijing 100717 |
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| Abstract: | Zircon U-Pb age determination and lithochemistry research of the granodiorite-tonalite intruded in Buqinshan ophiolitic melange,the western sector of A’nyemaqen Ophiolitic Belt, are first done and reported in this paper. Its zircon U-Pb age is 402±24Ma and belongs to Late Caledoian. The rock belongs to calc-alkaline series, has the features of island-arc granite,which hints that oceanic crust subduction and island-arc magmatism event occurred in the area in Early Paleozoic. The research achievement is of great significance to re-understand the tectonic framework and evolution of the area,even the Central Orogenic Belt. |
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| Keywords: | A'nyemaqen ophiolitic belt Granodiorite|tonalite Late Caledonian Island|arc magmatism |
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