地质通报2017，Vol.36Issue(4)：565-574,10.
辽东大石桥组蛇纹石化大理岩中铀矿化特征及形成时代
Geological features and dating of uraninite in serpentinized dolomite marbles of the Dashiqiao Formation in eastern Liaoning Province
摘要
Abstract
In this study,the authors analyzed the geological features and ore-forming ages of the newly found uranium mineralization in serpentinized dolomite marbles to infer their regional metallogenic significance.The uranium mineralization in serpentinized dolomite marbles occurs as uraninite breccias imprinted by later sulfide mineralization such as molybdenite,pyrite.The U-Pb isotopic dating indicates that the uraninite was formed in 1763～1794Ma.The in situ EPMA U-Th-Pb chemical dating of uraninite implies a thermal reworking event on uraninite at 1512±20Ma,which is synchronous to a regional magmatic event.The eastern Liaoning Province underwent significant geological evolution in Paleo-Proterozoic,from early rifting to collisional orogenesis and post orogenic extension.The newly found uranium mineralization in serpentinized dolomite marbles and the uranium mineralization in the Lianshanguan U deposit and in the Fe-B-U deposits in the Wengquangou area were all formed in a post orogenic/unorogenic extensional environment possibly related to the mantle plume activity in regional extensional tectonic setting.关键词
辽东/古元古代/大石桥组/铀成矿/地幔柱Key words
eastern Liaoning Province/Paleo-Proterozoic/Dashiqiao Formation/uranium mineralization/mantle plume分类
天文与地球科学引用本文复制引用
郭春影,李子颖,韩军,徐浩,白芸,任忠宝,韩愉,赵宇霆..辽东大石桥组蛇纹石化大理岩中铀矿化特征及形成时代[J].地质通报,2017,36(4):565-574,10.基金项目
国家自然科学基金项目《辽东古元古代碰撞造山过程的热液铀成矿作用:年代学约束》(批准号:41502097)、国防科技工业局核能开发项目《华北陆块北缘铀多金属矿综合评价技术研究》、国土资源科技创新团队培育计划《铀矿成矿理论与深部找矿技术》 （批准号:41502097）
