Geochronological Study of the Yarlung Tsangpo Ophiolite in the Region of the Eastern Himalayan Syntaxis
详细信息
- 责任者：Geng Quanru (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610082 ; China) ; Peng Zhimin
- 刊名：Acta Geologica Sinica
- 出版年：2011
- 卷期：85(7)
- 关键词：构造演化 ; structural evolution ; 蛇绿混杂堆积 ; ophiolite complexes ; 雅鲁藏布江 ; Yarlung Zangbo River
- 页码：p.1116-1127
- 图表：9 illus., 2 tables, 83 refs.
- 分类号：0300
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
This paper reports the results of geochronology study of the ophiolite. Two types of zircon were selected from metamorphosed basalt and gabbro. There are also some metamorphosed zircon grains that give ages ranging from 82.8 Ma to 70.8 Ma. Geochronological dating suggests that the ophiolite formed in Early Jurassic and locally in Late Triassic. The authors argue that the Neo-Tethys began northward subduction in the Early Jurassic to Late Triassic time and closed in the Late Cretaceous time, thus causing ophiolite tectonic emplacement.