豫西沙沟银铅锌矿床硫铅同位素地球化学  

Study on the Sulfur and Lead Isotope Geochemistry of the Shagou Ag-Pb-Zn Deposit in West Henan Province

作　　者：罗正传 郭保健 刘智琳 魏明君 曹廷坤 

机构地区：[1]河南省有色金属矿产探测工程技术研究中心,河南省郑州市450016 [2]河南省有色金属地质勘查总院,河南省郑州市450052 [3]河南省有色金属地质矿产局,河南省郑州市450016

出　　处：《矿产保护与利用》2016年第5期54-58,共5页Conservation and Utilization of Mineral Resources

基　　金：国土资源部公益性行业专项(201111007-2)

摘　　要：沙沟银铅锌矿床位于华北克拉通南缘豫西熊耳山地体西段,是近年来新发现的大型构造蚀变岩型银铅锌矿。通过对该矿床主成矿阶段石英-多金属硫化物矿石中金属硫化物的硫、铅同位素地球化学特征分析研究,认为硫同位素组成变化范围为-1.0‰-6.3‰,平均值2.0‰,硫主要来源地幔,并有地壳硫加入,具混合硫特征;铅同位素^206Pb/^204Pb比值为17.768-17.854,^207Pb/^204Pb比值为15.485-15.578,^208Pb/^204Pb比值为38.462-38.695,变化范围均不大,属于正常铅范围。利用计算获得的铅同位素相关特征参数,结合铅构造模式图及相关图解综合分析,认为矿石铅以幔源为主,具壳幔混合特征。矿床的硫、铅同位素组成表明,其成矿物质来源于造山过程中壳幔混合源,以幔源为主。Shagou large - scale Ag - Pb - Zn deposit is a structure controlled alteration type deposit, which is located in the western part of the Xiongershan in the south margin of north China eraton. The isotope data of the quartz - polymetallic sulfides in the m ain ore - forming stage show that δ34S/‰ varies from - 1.0‰ to 6. 3%o with an average of 2. 0‰ y implying that sulfur is mainly derived from mantle and minority derived from crust. The ^206 P b /^ 204P b of the ore varies from 17. 768 to 17. 854, ^207 Pb/^204 Pb varies from 15. 485 to 15. 578, and ^208 Pb / ^204Pb varies from 38. 462-38.695, which have narrow fluctuations and belong to normal Pb scope. According to the relevant characteristic parameters, its structure pattern and chart of the Pb , it is believed that the Pb of the ore is mainly derived from mantle and minor derived from crust. The isotope compositions of sulfur and lead in deposit indicate that the metallogenic materials are derived from the mixture of mantle and crust in orogenic process, and mainly from the mantle.

关 键 词：沙沟矿床 硫同位素 铅同位素 地球化学 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]