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Variscan terrane of deep-crustal granulite facies in Yushugou area, southern Tianshan.
- Source :
- Science in China. Series D: Earth Sciences; Oct1999, Vol. 42 Issue 5, p482-490, 9p
- Publication Year :
- 1999
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10069313
- Volume :
- 42
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Science in China. Series D: Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 49375921
- Full Text :
- https://doi.org/10.1007/BF02875242