内蒙古头道桥地区蓝闪石片岩和相关变质岩石岩石学特征及其构造意义

doi:10.13278/j.cnki.jjuese.20170272

Abstract

Abstract: A set of high pressure metamorphic rocks are exposed in the Toudaoqiao area, Inner Mongolia. In this study,the investigations on petrography and mineral chemistry are carried out, and two types of metamorphic rocks are classified to blueschist and greenschist on the basis of the mineral assemblages. The mineral assemblage of the blueschist is amphibole+epidote+albite+chlorite+quartz+hematite±phengite±calcite±titanite, and the mineral assemblage of the greenschist is chlorite+albite+quartz±amphibole±epidote±phengite±hematite. The blueschists were suffered from the epidote-blueschist facies metamorphism, with the peak metamorphic conditions of T=400-600℃, p=1.2-1.4 GPa. The greenschists were suffered from the epidote-amphibole facies metamorphism. According to the previous geochronology data, the high pressure blueschist and greenschist are related to the suture zone between Eerguna and Xing'an massifs.

Key words: Toudaoqiao area, blueschist, greenschist, high-pressure metamorphism, suture zone

CLC Number:

Zhao Limin, Liu Yongjiang, Teng Jiayu, Li Weimin. Character of Blueschist and Related Metamorphic Rocks from the Toudaoqiao Area, Inner Mongolia and Its Tectonic Implication[J].Journal of Jilin University(Earth Science Edition), 2018, 48(2): 534-544.

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Character of Blueschist and Related Metamorphic Rocks from the Toudaoqiao Area, Inner Mongolia and Its Tectonic Implication

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