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沽源-红山子成矿带核桃坝矿床矿相学和成矿年代学研究
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  • 英文篇名:Study on the mineragraphy and geochronology of Hetaoba uranium deposit in Guyuan-Hongshanzi uranium metallogenic belt
  • 作者:薛伟 ; 彭云彪 ; 李小伟 ; 剡鹏兵 ; 蒋孝君 ; 韩军 ; 刘小刚
  • 英文作者:XUE Wei;PENG YunBiao;LI XiaoWei;YAN PengBing;JIANG XiaoJun;HAN Jun;LIU XiaoGang;Faculty of Earth Resource,China University of Geosciences;No.208 Geologic Party,CNNC;School of Earth Sciences and Resources,China University of Geosciences;Beijing Research Institute of Uranium Geology;
  • 关键词:矿相学 ; 成矿年代学 ; 矿床 ; 核桃坝 ; 沽源-红山子成矿带
  • 英文关键词:Mineragraphy;;Geochronology;;Uranium deposit;;Hetaoba;;Guyuan-Hongshanzi uranium metallogenic belt
  • 中文刊名:YSXB
  • 英文刊名:Acta Petrologica Sinica
  • 机构:中国地质大学资源学院;核工业二○八大队;中国地质大学地球科学与资源学院;核工业北京地质研究院;
  • 出版日期:2019-04-15
  • 出版单位:岩石学报
  • 年:2019
  • 期:v.35
  • 基金:全国矿资源调查评价项目(12120113075500、DD2016013624);; 核工业二○八大队科研项目(201601)联合资助
  • 语种:中文;
  • 页:YSXB201904007
  • 页数:10
  • CN:04
  • ISSN:11-1922/P
  • 分类号:119-128
摘要
核桃坝矿床是著名的沽源-红山子成矿带上新近勘查突破的重要矿床之一。为恢复成矿过程、划分成矿阶段和探讨矿床成因,本文开展了系统的矿相学和成矿年代学研究,以期为区内矿勘查和找矿突破提供理论支持。矿相学研究表明,矿床矿石矿物以石为主,成矿作用可划分为早期钠长石化交代阶段、早期热液成矿阶段、晚期热液成矿阶段和成矿后阶段四个阶段。核桃坝矿床属于碱交代型(钠交代)热液矿床。沥青矿U-Pb同位素表观年龄、电子探针化学年龄以及等时线年龄综合研究显示,矿床形成时代应在99. 1Ma左右,是晚白垩世成矿作用的产物。核桃坝矿床可能是富岩体在碱交代作用后形成流体(富含硅酸成矿流体)在外部条件改变的情况下沉淀成矿。因此,矿体的定位与富岩体关系密切,富岩体附近的开放空间(断裂构造、层间破碎带等)是重要的找矿方向。
        Hetaoba uranium deposit is one of the most important uranium deposits on the Guyuan-Hongshanzi uranium metallogenic belt. In this paper,systematic study on the mineralogy and geochronology of the deposit were carried out to restore its metallogenic and genetic process,and to divide its ore-forming stages,so as to provide theoretical support for the exploration and prospecting of uranium deposits in this area. According to its mineralogical properties,the main ore-bearing mineral of the deposit is coffinite,and the oreforming mineralization of this depsoit can be divided into four stages: the early stages of sodium petrification,the early hydrothermal mineralization,the late hydrothermal mineralization, and the post-mineralization. Hetaoba deposit is a sodium metasomatic hydrothermal uranium deposit. U-Pb isotopic ages,isochron ages,and electron-probe chemical ages of the uranium minerals indicate that the ore-forming age should be around 99. 1 Ma,so the deposit was possibly formed by the Late Cretaceous mineralization. The formation of the Hetaoba uranium deposit may be resulted from the U-enriched silicic acid bearing fluids which was formed after the alkaline metasomatism of the uranium-enriched rocks and these fluids precipitated to form a deposit as the external conditions changed.Therefore,the deposit may be closely related to the uranium-rich rocks,and the open spaces in the vicinity of the uranium-rich rocks are important prospecting areas,including fractured structures,interlaminar fracture zones,etc.
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