Neoarchean Magmatism, Metamorphism in the Yinshan Block: Implication for the Genesis of BIF and Crustal Evolution
详细信息
- 责任者：Ma Xudong (Key Laboratory of Mineral Resources ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Fan Hongrui
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(7)
- 关键词：变质作用 ; metamorphism ; 岩浆作用 ; igneous processes ; 阴山 ; Yinshan Mountains
- 页码：p.2329-2339
- 图表：4 illus., 1 table, 12 refs.
- 分类号：0802
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The Yinshan Block is a coherent Neoarchean basement of the Western Block in the North China Craton.The representative is at Guyang area,which composed of granite-greenstone rocks at western and high-grade metamorphic complexes at eastern.The result of statistics of zircon U-Pb age statistics show either the granite-greenstone or the protoliths of the high-grade metamorphic complexes formed at the late Neoarchean (2562 ～ 2510Ma),and experienced two stage metamorphic event at ～ 2500Ma,～ 2480Ma respectively.The P-T path of the ～ 2.50Ga metamorphism is an anti-clockwise type,which is related with the mid-oceanic ridge subduction.There are a variety of special rocks which indicating the certain tectonic background in this area,such as:komatiite,komatiitic basalt,Nb-rich basalt,high-Mg andesite,TTGs and Sanukitoid.In conclusion,the Yinshan block is controlled by the plate tectonics,and experienced the mid-oceanic ridge subducted and collision orogeny successively.The BIFs in this are related with the mid-oceanic ridge subduction.The Si and Fe of BIFs are derived from the basalt at the bottom of greenstone belt and the komatiite,respectively.