资源调查与环境2012，Vol.33Issue(3)：191-197,7.
内蒙古锡林浩特I型花岗岩的时代及构造意义
Age and its tectonic significance of I-type granite in Xilinhot, Inner Mongolia
范中林 1柯于富 1陈文 1杨伟卫 1孙孝峰1
作者信息
- 1. 湖北省鄂东南地质大队,湖北大冶435100
- 折叠
摘要
Abstract
It is determined that the granite outcropped in Xilinhot reservoir area, Inner Mongolia, has been iden- tified as I-type granite with high abundances of Cr, Co and Ni, high contents of Ca and A1, high ratios of N20/K20 and low contents of Fe and Mg. In the trace elements spider grams, the granitic rocks show clear negative Nb, Ta, P and Ti anomalies. In the SiO2-K20 and AFM diagrams, the granitic rocks are mainly plotted in area of calc-alkaline series. In the tectonic setting discrimination diagrams, the granitic rocks are plotted in the area of volcanic arc granites ＋syncollision granites, indicating that the granite formed in an island-arc environment. The granite yields a zircon U-Pb age of 317.0±4. 0 Ma, correspond- ing to the late Carboniferous age. The suite of late Carboniferous island-arc type granitic rocks indicates that the Palo-Asian Ocean was not fully closed in the Caledonian period and the oceanic crust subduction and consumption-related events still occurred in the late Ccarboniferous. It is concluded that the late Car- boniferous granite may be caused by the southward subduction of the North Hegenshan oceanic basin.关键词
I型花岗岩/构造环境/锡林浩特/内蒙古Key words
I-type granite/tectonic setting/Xilinhot/Inner Mongolia分类
地质学引用本文复制引用
范中林,柯于富,陈文,杨伟卫,孙孝峰..内蒙古锡林浩特I型花岗岩的时代及构造意义[J].资源调查与环境,2012,33(3):191-197,7.
