西藏斯弄多银多金属矿床地球物理和地球化学勘查进展  

Geochemical and Geophysical Exploration in Sinongduo Ag Polymetallic Deposit,Xizang

作　　者：杨宗耀 唐菊兴[3] 任东兴 邓安 王鹰 吴鑫 Yang Zongyao;Tang Juxing;Ren Dongxing;Deng An;Wang Ying;Wu Xin(Chengdu Surveying Geotechnical Research Institute Corporation Limited of MCC,Chengdu 610023,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;Institute of Mineral Resources,CAGS,Beijing 100037,China;Chengdu Engineering Corporation Limited,PowerChina,Chengdu 611130,China)

机构地区：[1]中冶成都勘察研究总院有限公司,四川成都610023 [2]西南交通大学地球科学与环境工程学院,四川成都611756 [3]中国地质科学院矿产资源研究所,北京100037 [4]中国电建集团成都勘测设计研究院有限公司,四川成都611130

出　　处：《地球科学》2024年第3期1081-1103,共23页Earth Science

基　　金：国家自然科学基金项目(Nos.42230813,42072313,41772075);中国五冶集团重点专项课题(No.YFXM-20240116-0001)。

摘　　要：近年来在西藏冈底斯-念青唐古拉成矿带林子宗群火山岩分布区发现一系列中-大型铅锌银矿床,该区显示出巨大的找矿潜力.由于林子宗群火山岩分布范围广,如何有效地圈定成矿远景区,缩小找矿靶区是取得找矿突破的关键.选取产于谢通门县娘热地区典中组火山岩中的斯弄多银多金属矿床为研究对象,开展了大量勘查地球化学测量和激电中梯测量.结果显示典中组火山岩中铅锌银成矿作用具有Au、Mo、Pb、Zn、Ag异常,金银成矿作用具有强Au、Ag、Mo、As、Sb异常,主成矿元素变异系数大于3.以极化率大于2.5%和电阻率小于800Ω·m圈定隐伏铅锌银矿体的找矿靶区,取得了很好的找矿效果.上述结果表明激电中梯方法在林子宗群火山岩中寻找浅成低温热液型铅锌银矿体效果良好,能够为西藏冈底斯-念青唐古拉成矿带林子宗群火山岩中的找矿工作提供十分重要的指导.In recent years,many medium-large Pb-Zn-Ag deposits have been found in the Linzizong volcanic rocks in the Gangdese Nyainqêntanglha metallogenic belt,showing great potential for exploration.However,the key to exploration is how to conduct exploration targeting in the widespread Linzizong volcanic rocks.In this contribution,we conduct work of geochemical survey and induced polarization intermediate gradient in the Sinongduo Ag polymetallic deposit in the Dianzhong volcanic rocks.The results show that the Pb-Zn-Ag mineralization in the Linzizong volcanic rocks has Au,Mo,Pb, Zn and Ag anomalies, and the Au-Ag mineralization has strong Au, Ag, Mo, As and Sb anomalies, and the variation coefficient of the main mineralizing elements is more than 3. The target of the potential epithermal Pb-Zn-Ag mineralization is given based on the >2.5% polarizability and the <800 Ω ∙m resistivity, which has achieved good exploration results. Our findings demonstrate that the induced polarization (IP) intermediate gradient is effective in exploration for epithermal Pb-ZnAg deposits in the Linzizong volcanic rocks, and thus can provide an important guide for the exploration in the Linzizong volcanic rocks in the Gangdese Nyainqêntanglha metallogenic belt.

关 键 词：浅成低温热液型矿床 岩石化探 激电中梯 找矿标志 铅锌银多金属矿床 地球化学 矿床学 

分 类 号：P59[天文地球—地球化学] P31[天文地球—地质学]