地质力学学报2011，Vol.17Issue(3)：286-294,9.
内蒙古赤峰北部晚侏罗世花岗岩地球化学特征及构造背景
GEOCHEMICAL CHARACTERISTICS AND TECTONIC SETTING OF UPPER JURASSIC GRANITE FROM NORTHERN CHIFENG, INNER MONGOLIA
摘要
Abstract
Comparison geochemical characteristics of granite from northern Chifeng, Inner Mongolia with various type of granite at home and abroad and the discrimination show that most of the Chifeng granite belongs to I-type granite, and a small number of A-type with. It is with the characteristic of high-K and alkali. The trace elements is rich in Ba, Th, K and other large ion lithophile elements (LILE), while the high field strength elements (HFSE) Nb, Ti, etc. Are relatively depleted, which appear strongly depleted in Sr and P. LREE fractionation significantly, no significant fractionation of heavy rare earth. Significant negative Eu anomalies (δEu between the 0. 3-0. 843), REE patterns show significant Eu anomalies for the right-wing pedigree. Integrating the outcome of this paper and previous studies, we infer that the granite formed under the stretching and thinning environment. In this process, reducing the pressure and the upwelling of asthenosphere partial melting of the crust plays a role, so as to provide the conditions for the formation of granite.关键词
内蒙古赤峰地区/花岗岩/地球化学特征/构造环境Key words
Chifeng/ granite/ geochemical characteristics/ tectonic environment分类
天文与地球科学引用本文复制引用
刘昊,杨欣德,郝彬,刘贵权,李勇锋..内蒙古赤峰北部晚侏罗世花岗岩地球化学特征及构造背景[J].地质力学学报,2011,17(3):286-294,9.基金项目
中国地质调查局“内蒙古炒米房幅、土城子幅、新开地幅、大黑水幅1∶50000区域地质调查”项目(编号:1212011120661)资助. （编号:1212011120661）
