四川西昌米市盆地砂岩型铜—铼矿床(点)中Ag的含量特征及赋存状态  

CONTENT CHARACTERISTICS AND OCCURRENCE STATE OF Ag IN SANDSTONE TYPE COPPER-RHENIUM DEPOSIT IN MISHI BASIN,XICHANG,SICHUAN PROVINCE,SICHUANG

作　　者：郝雪峰[1,3] 唐屹 陈榜巧[2] 赵春 梁斌 彭宇[1,3] Hao Xuefeng;Tang Yi;Chen Bangqiao;Zhao Chun;Liang Bin;Peng Yu(Geological Survey of Sichuan Province,Chengdu 610081,Sichuan,China;School of Environment and Resource,Southwest University of Science and Technology Mianyang 621000,Sichuan,China;Sichuan Provincial Key Laboratory of Strategic Evaluation and Utilization of Rare Metal and Rare Earth Resources,Chengdu 610081,Sichuan,China)

机构地区：[1]四川省地质调查院,四川成都610081 [2]西南科技大学环境与资源学院,四川绵阳621000 [3]稀有稀土战略资源评价与利用四川省重点实验室,四川成都610081

出　　处：《矿物岩石》2022年第2期71-80,共10页Mineralogy and Petrology

基　　金：国家重点研发计划项目(编号:2017YFC0602702);四川省自然资源厅2020年省政府性投资地质勘查(第一批)(项目编号:DZ202006)。

摘　　要：本次研究对新近在西昌米市盆地下白垩统飞天山组(K_(1)f)中发现的砂岩型铜—铼矿床(点)中的银富集特征进行了分析,在此基础上采用扫描电镜—能谱微区分析及面扫描等方法,对金属矿物和沥青中的Cu,Ag等元素的含量、分布进行了分析,以确定Ag的赋存状态;并采用场发射透射电子显微镜(TEM)对银矿物的形貌进行了观察。结果表明:矿石中Ag含量较高,在分析的78件样品中,66件样品达到铜矿伴生Ag综合利用品位标准,金属量为2.37×10^(-6)~384.00×10^(-6),其中33件样品的Ag含量大于50×10^(-6),达到共伴生富矿品位标准。银的赋存状态有:以自然银、辉银矿、硫铜银矿等独立矿物形式存在,以类质同象形式赋存于辉铜矿和斑铜矿之中,还有以吸附或络合的形式赋存于沥青之中。扫描电镜下银矿物形态为1~3μm葡萄状的纳米级颗粒组成的大小一般为几十个纳米的不规则状絮状集合体颗粒直径。In this paper,the contents and distribution of Cu,Ag and other elements in metal minerals and bitumen of Lower Cretaceous Fetianshan Formation(K_(1)f)sandstone-type copper-rhenium deposit(spot)in Xichang Basin are measured and analyzed by scanning electron microscopy(SEM),energy spectrum microanalysis,surface scanning methods and transmission electron microscopy(TEM),so as to determine the occurrence state of Ag and the morphology of silver minerals.The results show that the content of Ag in the ore is high.Among the 78 samples analyzed,66 samples meet the comprehensive utilization grade standard of Ag associated with copper ore,with the metal content ranging from 2.37×10^(-6)to 384.00×10^(-6).Among them,33 samples have Ag content greater than 50×10^(-6),which meets the grade standard of co-associated rich ore.The occurrence state of silver is in the form of independent minerals such as natural silver,argentite,stromeyerite and other minerals,in the form of isomorphism in chalcocite and bornite,in the form of adsorption or complexation in asphalt.Under the scanning electron microscope,the silver mineral is composed of 1-3μm grape-like nanometer particles or irregular flocculent aggregates of dozens of nanometers.

关 键 词：银矿 赋存状态 飞天山组 西昌 

分 类 号：P579[天文地球—矿物学]