现代地质2017，Vol.31Issue(6)：1157-1169,13.
北秦岭西段黄牛铺岩体锆石U-Pb年代学、岩石地球化学特征及其地质意义
Zircon U-Pb Geochronology, Petrogeochemistry of Huangniupu Plutons in Western Section of the North Qinling Mountains and Their Geological Significance
摘要
Abstract
The research on LA-ICP-MS zircon U-Pb geochronology and petrogeochemistry of Huangniupu plutons is carried out.Results show that the zircon U-Pb age of Huangniupu plutons is (449.3 ±4.9) Ma,which indicates that the formation age of Huangniupu plutons is Late Ordovician.Huangniupu plutons belong to highk calc-alkaline series with quasi-aluminous feature,which has the mineral and geochemical characteristics in genetic type of I-type granite.The REE distribution patterns reveal that Huangniupu plutons have a right-wing type with LREE enrichment,HREE depletion (LREE/HREE =9.83-11.55) and weak negative Eu anomaly (δEu =0.82-0.95),and the trace elements show the enrichment in Rb,Th,U,Sm and obvious depletion in Ta,Nb,Ti,Hf,which is consistent with the geochemical features of magmatic rocks formed in island-arc.Combined with the regional geological data,it is concluded that Huangniupu plutons were formed in the island arc setting during Shangdan Ocean subduction in Late Ordovician and generated by the crustal-mantle magma mixing,which provides more sufficient and accurate evidences of magmatic activities for the further study on the tectonic evolution of the North Qinling Mountains.关键词
北秦岭西段/黄牛铺岩体/LA-ICP-MS定年/岩石地球化学Key words
western section of North Qinling Mountain/Huangniupu pluton/LA-ICP-MS dating/petrogeochemistry分类
天文与地球科学引用本文复制引用
姚征,张亚峰,杨涛,易鹏飞,郑淑新..北秦岭西段黄牛铺岩体锆石U-Pb年代学、岩石地球化学特征及其地质意义[J].现代地质,2017,31(6):1157-1169,13.基金项目
陕西省财政专项地质调查项目(20150101). （20150101）
