新疆塔木铅锌矿成矿流体特征与矿床成因  

Fluid characteristic and ore genesis of Tamu lead and zinc ore deposit,Xinjiang

作　　者：杨向荣[1,2,3] 彭建堂[1] 胡瑞忠[1] 戚华文[1] 刘燊[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002 [2]新疆大学地质与勘查工程学院,新疆乌鲁木齐830049 [3]中国科学院研究生院,北京100049

出　　处：《地球化学》2009年第6期536-548,共13页Geochimica

基　　金：中国科学院知识创新工程领域前沿项目(KZCX2-YW-107-6);国家科技支撑计划项目(2006BAB07B04-04)

摘　　要：新疆塔木铅锌矿赋存于石炭系碳酸盐岩断层破碎带中,矿体和手标本尺度呈现管/脉构造特点。管/脉壁主要由闪锌矿、方铅矿构成,管/脉中心充填白云石Ⅱ,管内可见钡-钾长石微粒,暗示成矿流体淋滤下伏地质体。充填期白云石Ⅱ较第Ⅰ期白云岩化灰岩表现出贫13C、18O的特点,反映成矿过程可能存在贫13C、18O的物质加入。鉴于白云石Ⅱ流体包裹体均一温度为119～191℃、闪锌矿流体包裹体存在CH4、C2H6、H2S气相组分、邻区达木斯乡和什拉甫剖面下石炭统有4个沥青显示点和24个荧光显示点、麦盖提斜坡海相石炭系曲1井、麦3井原油δ13C介于-34‰～-31‰之间及流体包裹体液相组分未见SO42-,可以推测成矿作用与热化学硫酸盐还原(TSR)过程相关。综合上述因素,可以认为新疆塔木铅锌矿为后生的与TSR作用相关的矿床。Tamu lead and zinc ore deposit locates in a fault fragmental belt of Carboniferous carbonate. Pipe-liked ore bodies distribute in the fragmental belt on macro scale and hand specimen scale. Sphalerite and galena constitute the wall of pipe, and the core is filled by dolomite Ⅱ. The particulate of hyalophane found in the pipe for the first time implies some parts of deeper materials have been leached. Comparing with dolostone Ⅰ, dolomite Ⅱ is depleted in ^13C and ^18O, implying addition of ^13C and ^18O depleted materials. Taking account of the homogeneous temperature of fluid inclusions in dolomite Ⅱ （119 - 191 ℃ ）, the CH4-C2H6-H2S gas composition of sphalerite fluid inclusions, four bitumen points and 24 fluorescence points in Heshilafu section, the negative δ^13C of - 34 to - 31 per mille of marine Carboniferous oil of Qu-1 well and Mai-3 well in Magaiti slope, and the absence of SO4^2- in the fluid inclusion, it is likely that the ore deposit was associated with thermal sulfate reduction （TSR）. Therefore, Tamu lead and zinc ore deposit is epigenetic.

关 键 词：热化学硫酸盐还原 稳定同位素 矿床成因 碳酸盐岩 塔木铅锌矿 新疆 

分 类 号：P596[天文地球—地球化学] P618.4[天文地球—地质学]