桂林理工大学学报2023，Vol.43Issue(4)：547-558,12.DOI:10.3969/j.issn.1674-9057.2023.04.002
四川冕宁尤黑木铁铜多金属矿床成矿时代和成因探讨:地球化学和独居石U-Pb定年证据
Metallogenic epoch and genesis of the Youheimu iron-copper polymetallic deposit in Mianning,Sichuan:evidence from U-Pb dating of monazite and geochemistry of rocks and ores
摘要
Abstract
The Kangdian iron-copper metallogenic belt on the western margin of the Yangtze landmass is one of the important copper rich and iron rich ore producing areas in China.However,the metallogenic epoch and gen-esis of many of its deposits are still controversial.Many orebodies of Youheimu iron-copper polymetallic ore de-posit located in Mianning,Sichuan,have reached a certain scale.There are few previous studies and reports on this,and its genesis and mineralization age are still unclear.In this paper,the wall rock and ore of the iron-copper orebody of the deposit are analyzed by geochemistry,and the ore is dated with LA-ICP-MS monazite U-Pb.The protolith of wall rock(biotite quartz schist)of the Heheimu iron-copper orebody is argillaceous rock mainly composed of clay minerals formed by volcanic deposition,with the addition of ancient sediment compo-nents.The LA-ICP-MS monazite U-Pb dating in Youheimu iron-copper orebody has two groups:one group is 812.8±4.6 Ma,representing the formation age of Lengzhuguan formation of Kangding Group;the other group is 698.5±5.0 Ma,representing the mineralization age of iron-copper orebody.The hydrothermal fluid brought by acid magma in the east of the study area flows in to the interlayer fracture zone of the wall rock,undergoes meta-somatism and skarnization with the surrounding rock,and forms iron-copper orebody.The genesis of the deposit is magmatic hydrothermal skarn.关键词
铁铜多金属矿床/独居石U-Pb定年/地球化学/成矿时代/矿床成因/尤黑木Key words
iron-copper polymetallic deposits/monazite U-Pb dating/geochemistry/metallogenic epoch/ore genesis/Youheimu分类
地质学引用本文复制引用
王玉山,周勇,吕小军,王飞,金飞,陈泽军,万平益..四川冕宁尤黑木铁铜多金属矿床成矿时代和成因探讨:地球化学和独居石U-Pb定年证据[J].桂林理工大学学报,2023,43(4):547-558,12.基金项目
四川省地质矿产勘查开发局项目(SCDKZCKJXM-2022039) （SCDKZCKJXM-2022039）
