江西德兴银山铜铅锌多金属矿床稳定同位素地球化学研究  

Stable isotope geochemistry study of Yinshan copper-lead-zinc polymetallic deposit in Dexing,Jiangxi

作　　者：吴荔 匡文龙[1] 张志辉 申滔 杨铖 张跃权 Wu Li;Kuang Wenlong;Zhang Zhihui;Shen Tao;Yang Cheng;Zhang Yuequan(School of Earth Science and Space Information,Hunan University of Science and Technology;Jiangxi Copper Group Yinshan Mining Co.,Ltd.)

机构地区：[1]湖南科技大学地球科学与空间信息工程学院 [2]江西铜业集团银山矿业有限责任公司

出　　处：《黄金》2024年第2期68-74,共7页Gold

基　　金：湖南省自然资源厅科研项目(2022-23);江西铜业集团科研项目(YSYJ2022001)。

摘　　要：针对银山铜铅锌多金属矿床进行氢、氧、硫、铅同位素研究,以判定其成矿物质的来源。研究结果表明:δD值为-78.9‰~-28.5‰,平均值为-56.5‰;δ18OV-SMOW值为12.10‰~18.70‰,平均值为16.06‰;δ^(18)O_(H_(2)O)值为0.18‰~11.26‰,平均值为8.24‰;反映了成矿流体是岩浆水和大气降水的混合。δ34S值为-1.04‰~2.71‰,平均值为1.35‰,与矿区赋矿地层张村岩组的硫同位素明显不同,暗示了成矿物质不是直接来自地层,但呈现出明显的幔源硫(-3‰~3‰)特征,与矿区火山-次火山活动有紧密联系。铅同位素206Pb/204Pb=17.890 0~18.319 0,207Pb/204Pb=15.528 0~15.602 5,208Pb/204Pb=38.025 2~38.445 0,表明铅来源为壳幔混源,矿石与岩浆岩具有亲缘性。The hydrogen,oxygen,sulfur,and lead isotopes of Yinshan copper-lead-zinc polymetallic deposit were studied to determine the sources of ore-forming materials.The research results indicate that theδD values range from-78.9‰to-28.5‰,with an average value of-56.5‰;theδ18 O V-SMOW values range from 12.10‰to 18.70‰,with an average value of 16.06‰;theδ^(18)O_(H_(2)O) values range from 0.18‰to 11.26‰,with an average of 8.24‰,indicating a mixture of magmatic water and atmospheric precipitation as the ore-forming fluids.Theδ34 S values range from-1.04‰to 2.71‰,with an average value of 1.35‰,which is significantly different from the sulfur isotopes of the ore-bearing strata of Zhangcun Formation in the mining area,suggesting that the ore-forming materials do not directly come from the strata but have a clear mantle sulfur(-3‰to 3‰)signature,closely related to volcanic-subvolcanic activities in the mining area.The lead isotopes(206 Pb/204 Pb=17.8900-18.3190,207 Pb/204 Pb=15.5280-15.6025,208 Pb/204 Pb=38.0252-38.4450)indicate a mixed source of crust and mantle,and the ores have an affinity with the magmatic rocks.

关 键 词：地球化学 银山铜铅锌多金属矿床 稳定同位素 次火山活动 岩浆岩 矿石 

分 类 号：TD11[矿业工程—矿山地质测量] P618.51[天文地球—矿床学]