SHRIMP U-Pb Ages of Zircon in the Gneiss of Erqisi Tectonic Belt in Altay, Xinjiang, and Their Geological Significances

Abstract

Abstract:

It is a long debate on the age of the middle- and high-metamorphic rocks of Erqisi tectonic belt in Altay,Xinjiang.The middle- and high-metamorphic rocks have been regarded as the Kemuqi Group, Lower- and Middle-Proterozoic erathem, and the Fuyun Group, Upper-Proterozoic, yet other research disagree.The age of the gneiss in Erqisi tectonic belt especially follows much interesting.According to the studies of the petrography, major- and trace-element chemistry, and zircon SHRIMP U-Pb ages of the gneiss in this paper, we suggest that the gneiss is similar to diorite and/or quartzdiorite in chemical compositions, and should be ortho-gneiss and the magma products in post-collision.Zircon U-Pb ages range from 350 Ma to 295 Ma, and ten spots yield a concordant mean U-Pb age of(326±6)Ma, indicating that they are Carboniferous intrusions.Furthermore, no Precambrian zircon has been documented in our measurements, which strongly argue against that the gneiss in Erqisi is Precambrian.Combining previous studies and our own data, we suggest that the middle- and high- metamorphic rocks in Altay could be of different ages.

Key words: zircon SHRIMP U-Pb age, gneiss, Erqisi tectonic belt, Xinjiang

CLC Number:

P588.34⁺5

LIU Guo-ren, QIN Ji-hua, ZHAO Zhong-he, XUE Hong-mei,ZHANG Li-wu, HE Li-xin. SHRIMP U-Pb Ages of Zircon in the Gneiss of Erqisi Tectonic Belt in Altay, Xinjiang, and Their Geological Significances[J]. Geoscience, 2008, 22(2): 190-196.

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