| 夏友河,刘智刚,刘军培,何书跃,屈光菊,李建兵.青海阿木尼克地区蛇绿岩的发现及其LA-ICP-MS锆石U-Pb年龄[J].矿产勘查,2018,9(2):204-212 |
| 青海阿木尼克地区蛇绿岩的发现及其LA-ICP-MS锆石U-Pb年龄 |
| Discovery of ophiolite and its LA-ICP-MS Zircon U-Pb age in the Amunike area, Qinghai |
| 投稿时间：2017-04-11 |
| DOI： |
| 中文关键词: 阿木尼克地区 蛇绿岩 LA-ICP-MS锆石U-Pb定年 青海 |
| 英文关键词: Amunike area,ophiolite , LA-ICP-MS ziron U-Pb dating, Qinghai |
| 基金项目:青海省科技厅重大科技专项柴达木盆地南北缘成矿系统与勘查开发示范(编号:2016-SF-A3)和国土资源部公益性行业科研专项(编号:201411025)联合资助。 |
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| 中文摘要: |
| 阿木尼克山位于柴达木盆地东北缘,近年来,在阿木尼克地区进行1∶5万区域地质调查的过程中,发现了一套蛇绿岩。柴达木盆地周缘残留多条早古生代蛇绿岩(蛇绿混杂岩)带,伴生高压—超高压变质作用,而且岩浆活动显著,为恢复古构造背景,研究早古生代洋盆形成、俯冲及闭合提供了丰富的地质资料。文章通过对蛇绿混杂岩中的斜长花岗岩进行LA-ICP-MS锆石U-Pb同位素测年,获得(485.6±2.4)Ma(MSWD=0.73)的同位素年龄。该年龄与柴北缘东段沙柳河地区蛇绿岩的时代可以很好的对应起来,这为柴北缘蛇绿岩延伸方向及柴达木盆地北缘的构造演化提供了新的年代学证据。 |
| 英文摘要: |
| Amunike mountain is located in the northeast margin of Qaidam basin, In recent years,a set of ophiolite is found in the process of develop 1∶50000 regional geological survey at Amunike area. There are some of residual early Paleozoic ophiolite(ophiolitic)belt in circumferentia of Qaidam Basin, associated high-ultrahigh pressure metamorphism and marked magmatic activity, which provides abundant geological data for restoring the ancient tectonic setting and studying the formation, subduction and closure of early Paleozoic ocean basin . In this paper, the LA-ICP-MS zircon U-Pb isotopic age of the plagiogranite from the ophiolitic is about(485.6+2.4)Ma(MSED=0.73)which can be connected with the age of ophiolite in Shaliuhe area in the east of Qaidam basin.This provides new chronological evidences for the extension direction of the ophiolite and the tectonic evolution of northern Qaidam basin. |
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