地质通报2017，Vol.36Issue(2)：429-444,16.
大别造山带姚冲花岗岩岩石地球化学特征及其地质意义
Geochemistry of the Yaochong granite in Dabie orogenic belt and its geological implications
摘要
Abstract
Located in the Qinling-Dabie orogenic belt, the Yaochong granite body mainly consists of biotite granite and granite porphyry. According to the geochemical analysis, Yaochong granites have the following data: SiO2=71.28% ~77.24% , K2O=3.81% ~5.28%, Na2O=3.76%~5.03%, Al2O3=11.61%~14.6%, and A/CNK=0.96~1.03. The rocks are enriched in LREE, depleted in HREE with negative Eu anomalies, enriched in Rb, U, Hf, Y and depleted in Ba, Nb, Ta, Ti, which indicates that Yaochong granites belong to metaluminous to peraluminous, high-K calc-alkaline I-type granite. According to zircon Hf isotope analysis, the εHf(t) values of the granite range from - 30 to - 22.8, lying below the depleted mantle line. The tDM2 values range from 2.21Ga to 2.60Ga, which indicates that the granite resulted from the lower crust of Yangtze block. The components of the granite porphyry are similar to those of Neoproterozoic TTG magmatic rocks. Yaochong granites were emplaced after the major collisional period of the North China block and Yangtze block, in a post-collisional tectonic setting under the regional extension mechanism. The geodynamic setting was the transformation of the tectonic regime of the late Jurassic-Early Cretaceous period.关键词
大别山/姚冲/花岗岩/地球化学/地质意义Key words
Dabie/ Yaochong/ granite/ geochemistry/ geological implications分类
天文与地球科学引用本文复制引用
刘清泉,邵拥军,陈昕梦,张喆,李永峰,黄小喜..大别造山带姚冲花岗岩岩石地球化学特征及其地质意义[J].地质通报,2017,36(2):429-444,16.基金项目
中国地质调查局项目《豫南大别山北麓地区钼多金属成矿规律及找矿方法研究》(编号:12120113091200)、湖南省国土资源科研项目《湖南浏阳-醴陵官庄金矿整装勘查区找矿勘查关键基础地质研究》(编号:2016-04)、中国地质调查局项目《湖南省花垣-凤凰铅锌矿整装勘查区关键基础地质研究》(编号:12120114052201) （编号:12120113091200）
