摘要
内蒙古乌拉特中旗大乌淀石墨矿床产于中元古代白云鄂博群尖山组一段黑色岩系中,含矿岩石为红柱石绢云绿泥石英片岩和绢云绿泥石英片岩。通过SHRIMP U-Pb测年法测定石墨矿石的沉积年龄应小于(1792.09±17.12)Ma。对含矿岩石的岩石学和地球化学研究表明,含矿岩石富集大量亲石元素,为稳定的还原沉积环境,含矿建造具有滨浅海环境沉积的特征。因此推断该石墨矿床为沉积岩系在侵入岩热接触作用下所形成的变质微晶石墨矿床。
Dawudian graphite deposit of Urad Middle Banner in Inner Mongolia occurs in black rock series of Jianshan Formation of Mesoproterozoic Bayan Obo Group. Ore-bearing rocks consist of andalusite-sericite-chloritequartz-schist and sericite-chlorite-quartz-schist. This paper carried out SHRIMP U-Pb dating analysis for graphite, suggesting that sedimentary ages of the graphite ore deposit is less than(1,792.09±17.12) Ma. Petrological and geochemical study of ore-bearing rocks shows that the ore-bearing rocks are characterized by enrichment of LILE, indicating a stable reduced sedimentary environment. Ore-bearing formation also presents sedimentary characteristic of littoral neritic environment. It can be concluded in this study that the graphite deposit belongs to metamorphic amorphous graphite ore deposit resulting from thermal contact of intrusive rocks to sedimentary rock series.
作者
杨培奇
刘敬党
刘淑梅
杨飞
杨孝伟
YANG Peiqi;LIU Jingdang;LIU Shumei;YANG Fei;YANG Xiaowei(School of Mining,Liaoning Technical University,Fuxin,Liaoning 123000,China;No.104 Exploration Team of Non-ferrous Geology of Liaoning Co.Ltd.,Yinkou,Liaoning 115007,China;Chemical Geological Exploration Institute of Liaoning Co.Ltd.,Jinzhou,Liaoning 121007,China)
出处
《现代地质》
CAS
CSCD
北大核心
2022年第2期672-681,共10页
Geoscience
基金
中国地质调查局项目“内蒙古1:5万钓鱼台、楚鲁达巴、东巴彦乌兰和塔拉达巴四幅区域地质调查”(DD2016020107)。
