An important spreading event of the Neo-Tethys Ocean during the late Jurassic and early Cretaceous: Evidence from zircon U-Pb SHRIMP dating on diabase in Nagarze, southern Tibet

被引：26

作者：

Jiang Sihong ^{[1
]}

Nie Fengjun ^{[1
]}

Hu Peng ^{[1
]}

Liu Yan ^{[1
]}

机构：

[1] Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China

来源：

ACTA GEOLOGICA SINICA-ENGLISH EDITION | 2006年 / 80卷 / 04期

关键词：

diabase; zircon U-PbSHRIMP dating; spreading event; Neo-Tethys; Nagarze; southern Tibet;

D O I：

暂无

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Widely distributed in Gyangze-Chigu area, southern Tibet, NW- and nearly E-W-trending diabase(gabbro)-gabbro diorite dykes are regarded as the product of the large-scale spreading of the late Neo-Tethys Ocean. In order to constrain the emplacement age of these dykes, zircons of two samples from diabases in Nagarze were dated by using the U-Pb SHRIMP method. Two nearly the same weighted mean Pb-206/U-238 ages were obtained in this paper, which are 134.9 +/- 1.8 Ma (MSWD = 0.65) and 135.5 +/- 2.1 Ma (MSWD = 1.40), respectively. They not only represent the crystallization age of the diabase, but also documented an important spreading event of the Neo-Tethys Ocean during the late Jurassic and early Cretaceous. This dating result is of great significance to reconstruct the temporal framework of the late Neo-Tethys Ocean in the Qinghai-Tibet Plateau.

引用

页码：522 / 527

页数：6