东秦岭龙门店银铅锌矿稳定同位素组成特征研究

龙门店银铅锌矿是东秦岭熊耳山银金钼成矿带重要的矿床之一。为研究龙门店银铅锌矿床成矿物质来源，在收集矿区及邻区区域地质和矿床资料的基础上，开展野外地质调查并采集样品，进行C—O同位素、S同位素和铅同位素测试分析，通过与周缘矿床对比分析，探讨龙门店银铅锌矿床同位素特征。研究结果显示:δ¹³CVPDB、δ¹⁸OSMOW、δ³⁴S和铅同位素组成表明龙门店银矿床成矿物质来源较复杂，与岩浆活动密切相关；K1矿化蚀变带成矿物质为上地壳，K9和K11-5矿化蚀变带成矿物质为地幔与下地壳混熔后形成的花岗岩浆。矿液在上升过程中与围岩发生了有限的物质交换，并有大气降水混入，在适当场所沉淀。研究有助于完善研究区银铅锌矿床成矿机理，服务于找矿实践。

Study on characteristics of stable isotope composition of Longmendian Ag-Pb-Zn deposit，Eastern Qinling Mountains

The Longmendian Ag-Pb-Zn deposit is one of the important deposits in Xiong′er mountain Ag-Au-Mo metallogenic belt in East Qinling.In order to study the ore-forming material source of Longmendian Ag-Pb-Zn deposit，based on the data of regional geology and ore deposits in the mining area and its adjacent areas，field geological survey was Carried out and samples were collected，and C-O isotope，S isotope and Pb isotope were tested and analyzed.The results showed that the ore-forming material sources of Longmen Dian silver deposit are complex through the analysis of composition of δ¹³CVPDB，δ¹⁸OSMOW，δ³⁴S，Pb，which is closely related to magmatic activities.The ore-forming material of K1 mineralization alteration zone is upper crust.The ore-forming materials of K9 and K11-5 mineralized alteration zones are granitic magma formed by the mixing of mantle and lower crust.There is limited material exchange between the ore fluid and the surrounding rock in the rising process，and there is precipitation in the appropriate place after mixing.