Variscan terrane of deep-crustal granulite facies in Yushugou area, southern Tianshan |
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| Authors: | Runsan Wang Dingwu Zhou Juli Wang Yan Wang Yangjie Liu |
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| Institution: | (1) Department of Geology, Northwest University, 710069 Xi’an, China |
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| Abstract: | The Yushugou terrane of deepcrustal granulite facies in southern Tianshan consists of two parts, granulite and metaperidotite.
The whole terrane is a metamorphism of (high-pressure) grunulite facies, and typical mineral associations are: Gt-Cpx-P1-Tit-Ilm
(±Qz) (silica-saturated and oversaturated mafic rocks), Gt-Ky (pseudomorph)-P1-Ru-Ilm± Qz (metapelitic rocks) and Spi-Opx-Cpx-01
(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 subducts 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.
Project supported hy the National Natural Science Foundation of China (Grant No. 49472135). |
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| Keywords: | southern Tianshan Xinjiang terrane of (high-pressure) granulite facies Variscan |
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