地质与勘探2024，Vol.60Issue(6)：1095-1104,10.DOI:10.12134/j.dzykt.2024.06.001
大兴安岭成矿带南段大座子山铜多金属矿成矿时代及其地质意义
Metallogenetic Epoch of the Dazuozishan Cu-Polymetallic Deposit in the Southern Part of the Great Hinggan Range Metallogenic Belt and Its Geological Significance
摘要
Abstract
The Dazuozishan deposit in Inner Mongolia is a recently discovered Cu-polymetallic deposit in the southern part of the Great Hinggan Range metallogenic belt.The orebodies in this deposit occurred in the rhyolite of Upper Jurassic Manketouebo Group,and the mineralization process was divided into three stages,i.e.,white quartz-minor sulfide stage(pyrite)stage,smoky quartz-polymetallic sulfide(pyrite,sphalerite,galena,chalcopyrite and molybdenite)stage and calcite-sulfide stage(pyrite,sphalerite and galena).This work conducted Re-Os dating of six molybdenite samples from the quartz-polymetallic sulfide mineralization stage,and obtained 134.4 to 136.9 Ma of model age with a weighted average age of 135.5±0.8 Ma.These ages are consistent with the 187Re-187Os isochronous age of 136.2±3.2 Ma.It is indicated that the Dazuozishan Cu-polymetallic deposit was formed in the Early Cretaceous,which was different from the previous age constrained by the Manketouebo rhyolite.Moreover,the Re content of the molybdenite ranged from 44.31×10-6 to 92.93×10-6,plotted between the crustal and mantle source regions.It is inferred that the ore-forming materials were derived from mixed crustal and mantle source.Based on the regional tectonic and magmatic evolution,the Dazuozishan copper polymetallic deposit was formed under extensional setting triggered by joint interactions between post-orogenic continental collapse of the Mongol-Okhotsk Ocean,and retreat and rollback of the Paleo-Pacific Ocean slab.关键词
辉钼矿/Re-Os定年/成矿时代/早白垩世/大座子山铜多金属矿/大兴安岭成矿带Key words
molybdenite/Re-Os dating/metallogenetic epoch/Early Cretaceous/Dazuozishan Cu-polymetallic deposit/Great Hinggan Range metallogenic belt分类
天文与地球科学引用本文复制引用
唐昆,林淞,康志宏,陈辉,俞炳,张军成,扈德峰,王永彬..大兴安岭成矿带南段大座子山铜多金属矿成矿时代及其地质意义[J].地质与勘探,2024,60(6):1095-1104,10.基金项目
国家自然科学基金(编号:42162009)、云南省基础研究计划项目-重点项目(编号:202201AS070004)和中地调研项目(编号:[2023]34)联合资助. （编号:42162009）
