地质论评2025，Vol.71Issue(4)：1177-1196,20.DOI:10.16509/j.georeview.2024.12.055
北东帕米尔木吉乡琼让二云母花岗岩的成因及其成矿意义
Petrogenesis and metallogenic significance of Qiongrang two-mica granites in Muji Town,NE Pamir
摘要
Abstract
Objectives:The Triassic granites in the West Kunlun-Pamir region is intricately linked to the evolution of the ancient Paleo-Tethys and metallogenesis of rare metals.Through the geochemical test of Qiongrang two-mica granites,the metallogenic potential of Li-Be rare metal deposit is determined in Muji area. Results:We conducted a comprehensive study of the petrology,zircon U-Pb geochronology,major and trace element geochemistry,and zircon Hf isotopic analysis of two-mica granites from the Qiongrang,SW Muji,NE Pamir.Zircon U-Pb dating yield the age of around 211.6 Ma,suggesting two-mica granites from the Qiongrang emplaced at Late Triassic.The two-mica granites from the Qiongrang exhibit high levels of SiO2(73.24％～74.09％),Al2O3(14.50％～15.01％),and K2O(5.52％～5.75％),and low TiO2(0.15％～0.18％)and MgO(0.30％～0.37％).They also exhibit strongly peraluminous geochemical features(A/CNK=1.12～1.15).The studied rocks are rich in Rb,Th,U,K and LREE,depleted in Sr,Ba,Nb,Ta,Ti,P and HREE,with obviously fractionation of LREE and HREE((La/Yb)N=44.62～54.58)and negative Eu anomaly(Eu/Eu*=0.52～0.59),belonging to strongly differentiated S-granite,formed by the dehydration melting of mica from metamudstone sources.The zircon eHf(t)value of two-mica granites from the Qiongrang from-7.93 to-0.91,and the zircon εHf(t)value of the Dahongliutan granites range from-8.8 to-1.4. Conclusions:The Qiongrang two-mica granites in Muji Town contain relatively high levels of Li and Be,and they are closely related in time-space to the Dahongliutan rare metal pegmative veins,it is speculated that the Qiongrang two-mica granites in Muji Town possess significant potential for the exploration of hard-rock lithium-beryllium mineralization.关键词
S-型花岗岩/三叠纪/成因/成矿/北东帕米尔Key words
S-type granite/Triassic/petrogenesis/metallogeny/Northeastern Pamir引用本文复制引用
钱旭坤,刘晓强,马华东,西艾力·阿尔肯,宋志豪..北东帕米尔木吉乡琼让二云母花岗岩的成因及其成矿意义[J].地质论评,2025,71(4):1177-1196,20.基金项目
本文为国家重点研发计划子课题(编号:2021YFC2901904)和新疆维吾尔自治区重点研发任务(编号:2022B03015-2)的成果. This paper is the result of the subproject of the National Key Research and Development Program(No.2021YFC2901904)and the Key Research and Development Task of Xinjiang Uyghur Autonomous Region(No.2022B03015-2) （编号:2021YFC2901904）
