Variscan terrane of deep-crustal granulite facies in Yushugou area, southern Tianshan

被引：6

作者：

王润三

周鼎武

王居里

王焰

刘养杰

机构：

来源：

Science in China(Series D:Earth Sciences) | 1999年 / 05期

基金：

中国国家自然科学基金;

关键词：

southern Tianshan; Xinjiang; terrane of (high-pressure) granulite fades; Variscan;

D O I：

暂无

中图分类号：

P588 [岩石分类];

学科分类号：

070901 ;

摘要：

The Yushugou terrane of deep-crustal granulite facies in southern Tianshan consists of two parts, granulite and metaperidotite. The whole terrane is a metamorphism of (high-pressure) granulite facies, and typical mineral associations are: Gt-Cpx-Pl-Tit-Ilm (±Qz) (silica-saturated and oversaturated mafic rocks), Gt-Ky (pseudomorph)-Pl-Ru-Ilm±Qz (metapelitic rocks) and Spi-Opx-Cpx-Ol (meta-ultramafic rocks). The peak-stage P-T conditions are 795—964℃, 0.97—1.42 GPa, which are obtained with mineral chemistry, assemblage analyses and P-T estimation. The Sm-Nd isochron age of peak-stage metamorphic minerals is (315±3.62) Ma. All of these indicate that the terrane is a deep-crustal body, which subduets to the depth of 40—50 km in the middle late-Paleozoic, undergoing metamorphism of (high-pressure) granulite facies, and exhumed again to the surface by tectonic uplifting.

引用

页码：482 / 490

页数：9