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| 北祁连山西段螯油沟蛇绿岩SHRIMP分析结果及其地质意义 | |
| 引用本文： | 张招崇,周美付,等.北祁连山西段螯油沟蛇绿岩SHRIMP分析结果及其地质意义[J].岩石学报,2001,17(2):222-226. |
| 作者姓名： | 张招崇 周美付 |
| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037 2. 香港大学地球科学系,香港香港大学地球科学系,香港 3. Department of Earth Sciences,Dalhousie University,Halifax,Nova Scotia,B3H 3J5,Canada 4. 中国地质科学院矿床地质研究所,北京,100037 5. 甘肃省地质矿产局地质科学研究所,兰州,730000 |
| 基金项目： | 本文为由国家计委国土司(JG9471902)和国家重点基础研究发展规划项目(G1999043205)的部分成果. |
| 摘 要： | 本文通过对北祁连山西段熬油蛇绿岩中辉绿岩岩墙的锆石SHRIMP法年龄 的测定，确定出熬油的沟蛇绿岩形成于中元古代早期（约1777Ma)，这是迄今为止我国发现的最古老的蛇绿岩。该年龄测定的结果还暗示了本区在1466Ma和507Ma各有一次地质事件，前者可能代表了中元古代早期的洋盆闭合的下限年龄，后者代表一次加里东期区域变质事件，并且本区可能还存在未出露的新太古结晶基底（2561Ma)。 |
| 关 键 词： | 蛇绿岩 中元古代早期 SHRIMP测年 北祁连山 地质事件 锆石 |
| 修稿时间： | 2000年10月4日 |
SHRIMP dating of the Aoyougou ophiolite in the west sector of the north Qilian Mountains and its geological significance. |
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| ZHANG ZhaoChong,ZHOU MeiFu,Paul T ROBINSON,MAO JingWen,YANG JianMin and ZUO GuoChao.SHRIMP dating of the Aoyougou ophiolite in the west sector of the north Qilian Mountains and its geological significance.[J].Acta Petrologica Sinica,2001,17(2):222-226. | |
| Authors: | ZHANG ZhaoChong ZHOU MeiFu Paul T ROBINSON MAO JingWen YANG JianMin and ZUO GuoChao |
| Institution: | ZHANG ZhaoChong,ZHOU MeiFu,Paul T ROBINSON,MAO JingWen,YANG JianMin and ZUO GuoChao . Institute of Geology,Chinese Academy of Geological Sciences,Beijing,Chin,. Department of Earth Sciences,The University of Hongkong |
| Abstract: | The SHRIMP U Pb zircon data of a diabase from the Aoyougou ophiolite in the west sector of north Qilian Mountains are reported in the paper. It shows that the Aoyougou ophiolite was formed in the early middle Proterozoic (about 1777Ma), and proves that it is the earliest ophiolite that has been reported in China. In addition, the dating implies that two geological events occurred about 1466 Ma, and 507 Ma, respectively. The former one probably represents the least closure age of the ocean basin of the early middle Proterozoic whereas the latter one represents the Caledonian regional metamorphism. Moreover, Late Archean crystallized basement (about 2561 Ma) may present in the area although it did not outcrop. |
| Keywords: | Ophiolite Early middle Proterozoic SHRIMP dating West sector of north Qilian Mountains |
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