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：0
|
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.
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页码：522 / 527
页数：6
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