东昆仑大干沟火山岩SHRIMP锆石U-Pb测年及其地质意义

彭渊; 马寅生; 刘成林; 孙娇鹏; 胡忠亚; 牟宏良; 郑策

东昆仑大干沟火山岩SHRIMP锆石U-Pb测年及其地质意义

1. 中国地质科学院矿产资源研究所, 北京 100037;
2. 中国地质科学院地质力学研究所, 北京 100081;
3. 中国石油大学(华东)地球科学与技术学院, 山东青岛 266555;
4. 山东胜利油田海洋采油厂, 山东东营 257237;
5. 中国石油大学(北京)地球科学学院, 北京 102249

收稿日期: 2015-11-23

修回日期: 2016-01-19

刊出日期: 2016-03-15

SHRIMP zircon ages of the Dagangou volcanic rocks in the Eastern Kunlun orogenic belt and their implications

1. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
3. School of Geosciences in China University of Petroleum, Qingdao 266555, Shandong, China;
4. Marin oil production plant, Shengli oilfiled, Dongying 257237, Shandong, China;
5. College of Geosciences in China University of Petroleum, Beijing 102249, China

Received Date: 23 November 2015

Revised Date: 19 January 2016

Publish Date: 15 March 2016

摘要

摘要: 东昆仑大干沟以北地区造山后形成的牦牛山组磨拉石建造不整合覆盖于前泥盆系之上,其形成时代对限定柴达木盆地加里东造山作用的结束时间及晚古生代裂解作用的开始时间具有重要意义。应用单颗粒锆石离子探针质谱仪(SHRIMP)方法,对牦牛山组上部火山岩段的样品进行精确的锆石U-Pb测年。结果表明,牦牛山组上段火山岩样品DG01和DG02中的岩浆锆石²⁰⁶Pb/²³⁸U平均年龄分别为403.6±5.1Ma和409±3.4Ma。综合前人研究认为,造山后牦牛山组伸展型磨拉石的形成时代为晚志留世-早泥盆世,限定了晚古生代裂解的开始时间,也意味着早古生代加里东造山运动在晚志留世-早泥盆世之前已经结束。
- 东昆仑大干沟 /
- 火山岩 /
- SHRIMP锆石U-Pb年龄 /
- 早泥盆世 /
- 东昆仑造山带
Abstract: The Maoniushan Formation of molasse, formed in a post-orogenic environment in Dagangou area of the Eastern Kunlun Mountains, rests unconformably on pre-Devonian strata. Its formation time is critical for determining the terminal of the Caledonian orogeny and the initiation of splitting in the Late Paleozoic. The authors conducted zircon U-Pb dating for volcanic rocks of the Up-per Maoniushan Formation by SHRIMP. The samples(DG01 and DG02) of the Upper Maoniushan Formation yielded two average zircon U-Pb ages of 403.6±5.1Ma and 409±3.4Ma. Combined with the previous studies, the formation time of the Maoniushan For-mation should be Late Silurian-Early Devonian. This provides a constraint on the starting time of splitting in the Late Paleozoic and also means that the Caledonian orogeny ended before the Late Silurian-Early Devonian.
- Dagangou area in Eastern Kunlun Mountains /
- volcanic rock /
- SHRIMP zircon U-Pb age /
- Early Devonian /
- Eastern Kun- lun orogenic belt

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东昆仑大干沟火山岩SHRIMP锆石U-Pb测年及其地质意义

SHRIMP zircon ages of the Dagangou volcanic rocks in the Eastern Kunlun orogenic belt and their implications

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