南天山沙里塔什铅锌矿床地质特征及S、Pb同位素特征研究  

Geologic Characteristics,Sulfur and Lead Isotope Study of the Shalitashi Lead-zinc Deposit,Southern Tianshan

作　　者：张舒[1,2] 张招崇[1] 黄河[1] 张东阳[1] 薛春纪[1] 

机构地区：[1]地质过程与矿产资源国家重点实验室中国地质大学地球科学与资源学院,北京100083 [2]安徽省地质调查院,安徽合肥230001

出　　处：《现代地质》2010年第5期856-865,共10页Geoscience

基　　金：国家科技支撑项目(2007BAB25B05);国家自然科学基金项目(40925006)

摘　　要：沙里塔什铅锌矿床是新疆南天山多金属成矿带内重要的铅锌矿床。矿床位于南天山造山带迈丹—阔克萨勒古生代陆缘盆地,含矿层位为中泥盆世托格买提组,单个矿体呈透镜状、巢状和筒状分布在白云岩构造破碎带内,围岩蚀变较弱。矿石中金属矿物以闪锌矿、方铅矿为主。矿石金属硫化物的δ34S=-3.6‰^-12.0‰,指示硫主要来自海相硫酸盐的还原作用。矿石金属硫化物的206Pb/204Pb比值范围为17.897 9~17.962 5,207Pb/204Pb为15.598 1~15.602 3,208Pb/204Pb为38.186 3~38.197 1,结合矿石、围岩的微量及稀土元素特征判断,铅主要来自古生代沉积盆地高金属背景值的中泥盆世托格买提组。综合沙里塔什铅锌矿床的地质、地球化学特征,判定其为MVT型铅锌矿床。The Shalitashi lead-zinc deposit located in Xinjiang Uygur Autonomous Region,NW China is an important lead-zinc deposit in the southern Tianshan polymetallic metallogenic belt.The deposit occurs in the Paleozoic Maidan-Kuokeshale basin as lens,nested and tubular orebodies within the structure fracture zone in the dolomite of the middle Devonian Tuogemaiti Formation.The alteration is weakly developed in the wall rocks.The dominant sulfide minerals in the ore are sphalerite and galena.The ore structures include open-space filling and host-rock replacement.The δ34S values for the sulfide minerals range from-3.6‰ to-12.0‰ which indicates that the reduced sulfur is derived from the seawater sulfate.The 206Pb/204Pb values for sulfides range from 17.8979 to 17.9625,207Pb/204Pb from 15.5981 to 15.6023,208Pb/204Pb from 31.1863 to 38.1971,which implies that the metals were derived from the sediments with high metal contents in the Paleozoic basin.On the basis of the geology and geochemistry characteristics,the Shalitashi lead-zinc deposit can be classified into Mississippi valley-type lead-zinc deposit.

关 键 词：沙里塔什 南天山造山带 铅锌矿床 矿床地质 地球化学 S、Pb同位素 

分 类 号：P618.2[天文地球—矿床学]