辽东大石桥组蛇纹石化大理岩中铀矿化特征及形成时代

发布时间：2018-05-09 03:21

本文选题：辽东 + 古元古代　；参考：《地质通报》2017年04期

【摘要】：在辽东大石桥组蛇纹石化大理岩中新发现晶质铀矿矿化现象。晶质铀矿呈角砾状发育在蛇纹石化白云石大理岩中,并叠加有辉钼矿、黄铁矿等矿化。U-Pb同位素年龄测定显示,晶质铀矿形成于1763~1794Ma。EPMA U-Th-Pb化学年龄显示,晶质铀矿形成后经历了1512±20Ma的热事件改造,对应一次岩浆侵入事件。辽东地区经历了古元古代的裂谷拉张、碰撞造山、造山后伸展等重大地质事件。大石桥组中蛇纹石化大理岩中的铀矿化,以及连山关铀矿床、翁泉沟地区铁-硼-铀矿床的热液铀成矿作用均形成于古元古代晚期造山后/非造山区域伸展环境,可能与区域伸展体制下的地幔柱活动有关。
[Abstract]:The mineralization of crystalline uranium deposits has been newly discovered in serpentine marble of Dashiqiao formation in eastern Liaoning. The gravel-shaped uranium deposits developed in the serpentine dolomite marble with molybdenum, pyrite and other mineralization. U-Pb isotopic dating shows that the crystalline uranium deposits were formed in the 1763~1794Ma.EPMA U-Th-Pb chemical age. The uranium deposit underwent a thermal event transformation of 1512 卤20Ma after its formation, corresponding to a magmatic intrusion event. Liaodong area has experienced some important geological events such as ancient rift extension, collision orogeny and post-orogenic extension. Uranium mineralization in serpentine marble in Dashiqiao formation, and uranium mineralization in Lianshanguan uranium deposit, and hydrothermal uranium mineralization of Fe-B uranium deposit in Wengquangou area were formed in post-orogenic / non-orogenic extension environment of late Gu Yuan. It may be related to mantle plume activity under regional extensional regime.
【作者单位】：核工业北京地质研究院;中核集团铀资源勘查与评价技术重点实验室;中核集团地质矿产事业部;中国地质大学(北京)地球科学与资源学院;
【基金】：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》
【分类号】：P619.14

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