竹山下铀矿床碱交代岩特征与铀成矿关系  

Characteristics of alkaline metasomatic rocks in Zhushanxia uranium deposit and its relationship with uranium mineralization

作　　者：靳杨[1] 刘颖[1] 钟福军 沈滔[1] 

机构地区：[1]东华理工大学放射性地质与勘探技术国防重点学科实验室,江西南昌330013

出　　处：《矿产与地质》2015年第2期208-214,共7页Mineral Resources and Geology

基　　金：国家自然科学基金资助项目(40872072)资助

摘　　要：围岩与热液所发生的的置换作用称为交代作用,顾名思义碱交代作用就是钾、钠碱金属性化学物质参与交代作用。碱金属(钾、钠)带进热液蚀变岩称为碱交代岩。所以碱交代作用主要是以热液作用为主体,对金属元素成矿物质的迁移和富集成矿起到了很重要的作用。诠释了热液作用是成矿物质富集的驱动力。碱交代岩是竹山下铀矿床主要的蚀变类型之一。通过对竹山下碱交代型铀矿床的钻孔20-1碱交代岩进行野外踏勘采集样品、室内岩相学分析和电子探针成分分析研究,确定了竹山下地区碱交代作用对铀矿床的实质为钾交代作用,碱交代作用使得富铀岩石中的惰性铀成为活性铀,从而被活化迁移,富集成矿。The replacement occurred in wall rocks and hydrothermal fluid was referred to as metasomatism. As the name implied alkaline metasomatism was metasomatism involved with K-Na alkali metal chemicals. Hydrothermalaltered rocks involved with alkali metal （K,Na）were referred to as alkaline metasomatic rocks.Therefore,alkaline metasomatism occurred mainly as hydrothermal activity,and had important effects on migration and enriched mineralization of metal element metallogenic matters.This paper explained that hydrothermal activity was the drive of enrichment of metallogenic matters.Alkaline metasomatic rock was one of the primary alteration types in Zhushanxia uranium deposit.Based on the field survey and sam-pling of alkaline metasomatic rocks in drilling hole 20-1 of Zhushanxia metasomatic uranium deposit and in-door petrographic analysis and electron probe analysis on the samples,this paper determined that the alkaline metasomatism on uranium deposit in Zhushanxia area was in fact potash metasomatism,and it transferred immobile uranium in uranium-rich rocks into mobile uranium which thus were being mobilized and enriched.

关 键 词：铀矿床 碱交代作用 钠交代 钾交代 

分 类 号：P619.14[天文地球—矿床学]