地质学报Issue(2)：208-227,20.
湖南紫云山岩体的地质地球化学特征及其成因意义
Geological and Geochemical Characteristics and Genetic Significance of the Ziyunshan Pluton in Hunan Province
摘要
Abstract
The Ziyunshan pluton consists of granodiorites and biotite granites,the former granites ring distribute in its marginal belt,are the main rock type with zircon LA-ICP-MS age of 222 .5 ± 1 Ma,which are randomly distributed mafic micogranular enclaves,and the latter granites in its interior part were intruded into the former granites,with zircon LA-ICP-MS age of 222.3 ±1.8Ma.The both types rocks are Late Indosinian granites.The SiO2 content of two types of granitic rocks have obvious discontinuity,and A/CNK range respectively 0. 99~0. 105 and 1. 08~1. 15,the granodiorites are metaluminous to weakly peraluminous I-type granites,and the biotite granites are weakly peraluminous to stongly peraluminous S-type granites.The two types granites both have high Rb,Cs,Rb/Sr,and (87 Sr/86 Sr)i values,and low Sr,Ba,Eu,εNd (t)values,slightly to moderately negative Eu anomalies.These geochemical characteristics indicate that they derived from Precambrian metamorphic basement.The different P-T conditions and depths of their formation indicate that they have different regions.The two-stage granitic rocks of Ziyunshan pluton were formed by the collisional compression and decay between Southern China and Indo-China.The ganodiorites with a little mantle component were formed by magmas underplating,then the partial meltling of mud-sandy sediments in upper crust produced the biotite granites. The spatial distribution and high-precision age data of the Indonian granites in South China show that the rock-age of granitic rocks gradually turn new from south to north in Southern China inland belt and Wuyi-Yunkai mountains belt,along with the compressive stress transfered from south to north caused by the collision between Indo-China and Southern China.关键词
紫云山岩体/LA-ICP-MS锆石定年/地球化学特征/成因意义/湖南Key words
Ziyunshan pluton/zircon LA-ICP-MS age/geochemical characteristics/genetic significance/Hunan引用本文复制引用
刘凯,毛建仁,赵希林,叶海敏,胡青..湖南紫云山岩体的地质地球化学特征及其成因意义[J].地质学报,2014,(2):208-227,20.基金项目
本文为中国地质调查局科技外事部基础地质研究项目（编号1212010611805，1212010911012，1212011121098）、国家国际科技合作专项（编号2011DFA22460）、中国地质调查局基础部基础地质项目（编号1212011120120）、中国地质调查局地质矿产调查评价项目（编号12120113070800、1212011085446）资助的成果。 （）
