U-Pb Ages, Hf Isotope and REE Patterns of Older Zircons From Devonian Volcanic Rocks in Ashele Basin on the Southern Margin of Altai Orogen and Its Geological Significance
详细信息
- 责任者：Song Guoxue (Key Laboratory of Mineral Resources ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Qin Kezhang
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(10)
- 关键词：火山岩 ; volcanic rocks ; 铀—铅计时 ; U-Pb dating ; 铪同位素 ; hafnium isotopes ; 新疆 ; Xinjiang
- 页码：p.2946-2958
- 图表：4 illus., 3 tables, 78 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
In this paper, LA-ICP-MS zircon U-Pb dating, zircon Hf isotopes and REE patterns were used for researching on the Devonian volcanic rocks in Ashele Cu-Zn district. The concordant age of 1985±8.9 Ma and the weighted age of 2005±30 Ma of a group of older zircons from volcanic rocks by the zircon U-Pb dating represent the forming age of the Precambrian crystalline basement in Altai region. Zircon U-Pb ages, Hf isotopes and Ce negative anomaly implied that Altai Precambrian crystalline basement may be formed in the background of gathering together of Columbia super-continent, and its source material came from the non-uniform mixing of the reducing mantle materials and oxidized crustal materials.