地质与资源2018，Vol.27Issue(3)：224-234,278,12.
大兴安岭北段漠河富源沟林场早侏罗世花岗岩——年代学、地球化学特征及构造意义
EARLY JURASSIC GRANITES IN FUYUANGOU FOREST FARM OF MOHE COUNTY, NORTHERN DAXINGANLING MOUNTAINS:Chronology, Geochemistry and Tectonic Implications
摘要
Abstract
Through the study of petrography, geochemistry and LA-ICP-MS U-Pb dating of the Early Jurassic granites in Fuyuangou Forest Farm, northern Daxinganling Mountains, the paper discusses their constraints on the regional tectonic evolution. Dominated by monzogranite, the granites are formed in Early Jurassic shown by the zircon dating results of samples. The geochemical analyses reveal that the monzogranite, belonging to high-K calc-alkaline, metaluminous I-type granitoid, is characterized by enrichment of LREEs and LILEs (Rb, K and Ba), and depletion of HREEs and HFSEs(Nb, Ta and P). The primary magma for the monzogranite is derived from partial melting of basaltic lower crust. Combined with the regional data, the emplacement of granites indicates that the Mohe region was still in the tectonic environment of subduction of Mongolia-Okhotsk oceanic plate beneath Erguna Massif during the Early Jurassic Epoch.关键词
蒙古-鄂霍次克缝合带/早侏罗世/二长花岗岩/大兴安岭北段Key words
Mongolia-Okhotsk suture zone/Early Jurassic/monzogranite/Northern Daxinganling Mountains分类
天文与地球科学引用本文复制引用
胡军海,杨华本,周传芳,高晓琦,魏小勇,孙桐,李宇菡,马靖..大兴安岭北段漠河富源沟林场早侏罗世花岗岩——年代学、地球化学特征及构造意义[J].地质与资源,2018,27(3):224-234,278,12.基金项目
中国地质调查局"黑龙江大兴安岭洛古河等4幅1∶5万区域地质矿产调查"项目(编号DD2016007803). （编号DD2016007803）
