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

详细信息   

• 责任者：Liu Guoren (Graduate School ; China University of Geosciences ; Wuhan ; 430074 ; China) ; Qin Jihua
• 刊名：Geoscience
• 出版年：2008
• 卷期：22(2)
• 关键词：片麻岩 ; gneisses ; 阿尔泰山 ; Altai Mountains
• 页码：p.190-196
• 图表：6 illus., 4 tables, 14 refs.
• 分类号：0802
• issnNo：ISSN1000-8527
• isbnNo：CN11-2035/P

摘要

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, the authors 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.