辽东连山关(3075)铀矿床流体包裹体测温研究  

Study on the Homogenous Temperature Measurement of Fluid-inclusion From Lianshanguan(No.3075)Uranium Deposit,Eastern Liaoning

作　　者：汤志帅 陈琳 类维东 郭春影[4] TANG Zhishuai;CHEN Lin;LEI Weidong;GUO Chunying(Real Estate Trading and Register Center of Wulian County,Rizhao,Shandong 262300,China;Rizhao Government Services Center,Rizhao,Shandong 276800,China;Real Estate Trading and Register Center of Rizhao,Shandong 276800,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]五莲县不动产交易登记中心,山东日照262300 [2]日照市政务服务中心,山东日照276800 [3]日照市不动产交易登记中心,山东日照276800 [4]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2024年第6期1148-1157,共10页Uranium Geology

基　　金：国家自然科学基金青年科学基金项目“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”(编号:41502097)资助。

摘　　要：连山关(3075)铀矿床是我国品位最好的热液铀矿床之一。为了探讨该矿床成矿模式,为矿区外围找矿提供依据,文章通过矿石矿物特征和围岩蚀变对成矿阶段进行了划分,并结合流体包裹体测温,对比研究了不同成矿阶段流体性质特征。结果显示,连山关(3075)铀矿床发育的围岩蚀变主要有绢云母化、硅化、钠长石化、绿泥石化、碳酸盐化,其中绢云母化贯穿于成矿作用的始终,硅化、钠长石化主要发生在成矿早阶段,绿泥石化、碳酸盐化主要发生在成矿晚阶段。从成矿早阶段、主成矿阶段到成矿晚阶段,流体包裹体的均一温度峰值依次为320~340℃、260~280℃和160~180℃,流体盐度峰值依次为15%~18%NaCl_(eqv)、10%~11%NaCl_(eqv)和6%~7%NaCl_(eqv),流体密度集中在区间0.8~1.0 g/cm^(3)。连山关(3075)铀矿床属于中高温、中低盐度、低密度热液铀矿床,随着流体的演化,成矿流体的温度、盐度、压力不断下降,压力的急剧下降是促使铀沉淀的重要因素;区内北西西向和北东东向断裂控矿作用明显,既是变质热液运移的通道,也是铀矿物沉淀的场所,为矿区外围找矿提供了方向。Lianshanguan(No.3075)uranium deposit is one of the highest grade hydrothermal uranium deposit in China.In order to analyze the metallogenic model and provide a basis for guiding the prospecting in the periphery of the mining area,the ore-forming stages were divided according to ore mineral characteristics and wall rock alteration,the fluid properties of different ore-forming stages were compared and studied by fluid inclusion temperature measurement.The wall rock alteration in Lianshanguan(No.3075)uranium deposit includes sericitization,silicification,albitization,chloritization and carbonatization,and the sericitization occurred in all metallogenic stages,silicification and albitization happened in the early stage of mineralization,chloritization and carbonatization existed in the late stage of mineralization.From the early stage,middle stage to late stage of mineralization,the peak value of homogenous temperature was respectively 320~340℃,260~280℃and 160~180℃;the peak value of salinity was respectively 15%~18%NaCl_(eqv),8%~11%NaCl_(eqv) and 6%~7%NaCl_(eqv);the density of fluid ranged from 0.8 to 1.0 g/cm^(3).Therefore,the uranium deposit fall into the hydrothermal one with medium high temperature,medium low salinity and low density.In the evolution of the fluid,the temperature,salinity and pressure of the ore-forming fluid continuous drop,the sharp drop of pressure is an important factor to precipitate uranium;The NWW and NEE trending faults have obvious ore-controlling effects,which acts as not only the channels for metamorphic hydrothermal migration,but also the places where uranium minerals are deposited,and can be used to direct the prospecting outside the mining area.

关 键 词：连山关铀矿床 围岩蚀变 包裹体测温 

分 类 号：P619.14[天文地球—矿床学]