Petrology and 40Ar/39Ar isotopic ages of blueschists in Gangmar, central Qiangtang, northern Tibet

被引：13

作者：

Deng, XG ^{[1
]}

Ding, L ^{[1
]}

Liu, XH ^{[1
]}

Zhou, Y ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, Lab Lithospher Tecton Evolut, Beijing 100029, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 2001年 / 46卷 / 05期

关键词：

glaucophane; blueschist; 39Ar/40Ar age; Palaeo-Tethys; Gangmar; northern Tibet;

D O I：

10.1007/BF03183281

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 ; 0710 ; 09 ;

摘要：

The petrology and mineral assemblages of blueschists in the Gangmar, central Qiangtang, northern Tibet were examined, which indicates that the metamorphic condition is high-pressure low-temperature, In this note, we reported the 40Ar/39Ar dating results of glaucophane from two blueschist samples. Their apparent ages are (275.0+/-1.3) Ma and (287.6+/-2.3) Ma and similar isochron ages are (275.0+/-0.9) Ma and (282.4+/-0.8) Ma, respectively. These isotopic datings show the high-pressure metamorphism occurring in Lower Permian. The ages also coincide with the evolution of Palaeo-Tethys ocean in Late Palaeozoic.

引用

页码：423 / 427

页数：5

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