SHRIMP dating of the Bangong Lake SSZ-type ophiolite: Constraints on the closure time of ocean in the Bangong Lake-Nujiang River, northwestern Tibet

被引：217

作者：

Shi RenDeng ^{[1
]}

机构：

[1] Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China

[2] Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 2007年 / 52卷 / 07期

基金：

中国国家自然科学基金;

关键词：

SSZ-type ophiolite; gabbro; zircon; SHRIMP; Bangong Lake; Tibet;

D O I：

10.1007/s11434-007-0134-z

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 [理学]; 0710 [生物学]; 09 [农学];

摘要：

The Bangong Lake ophiolite is located in the westernmost part of the Bangong Lake-Nujiang River suture zone. It is a tectonic melange consisting of numerous individual blocks of peridotite, pillowed and massive lavas and mafic dykes with SSZ-type ophiolitic geochemical affinity formed at the end of a Wilson circle. The SHRIMP U-Pb ages of the co-magmatic zircon domains from one gabbroic dyke (Sample 01Y-155) range from 162.5 +/- 8.6 Ma to 177.1 +/- 1.4 Ma with an average of 167.0 +/- 1.4 Ma (n = 12, MSWD = 1.2), suggesting that the subduction of the Bangong Lake Neo-Tethyan Ocean started before the Middle Jurassic. It is inferred that the tectonic transform from spreading to subduction of the Neo-Tethyan Ocean began before the Middle Jurassic in the Bangong Lake area.

引用

页码：936 / 941

页数：6

共 31 条

[1]

STRUCTURE AND EVOLUTION OF THE HIMALAYA-TIBET OROGENIC BELT [J].