云南白牛厂银多金属矿床硫同位素组成及滇东南多金属矿找矿远景  

Sulfur Isotopic Composition of Bainiuchang Ag-polymetallic Deposit and the Prospecting Prospective for Polymetallic Deposit of Southern Yunan Province

作　　者：李开文 张恺 郭君功 刘坤[1] 方怀宾[1] 张乾[5] Li Kaiwen;Zhang Kai;Guo Jungong;Liu Kun;Fang Huaibin;Zhang Qian(Henan Institute of Geological Survey,Zhengzhou 450001,China;Henan Key Laboratory for Metal Mineral Ore-forming Geological Process and Utilization of Resource,Zhengzhou 450001,China;The Second Geological Survey Institute of Henan Bureau of Geology and Mineral Resources,Zhengzhou 450000,China;Henan Geological Science Research Institute,Zhengzhou 450001,China;Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China)

机构地区：[1]河南省地质调查院,河南郑州450001 [2]河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450001 [3]河南省地质矿产勘查开发局第二地质勘查院,河南郑州450000 [4]河南省地质科学研究所,河南郑州450001 [5]中国科学院地球化学研究所,贵州贵阳550002

出　　处：《金属矿山》2018年第10期138-145,共8页Metal Mine

基　　金：国家自然科学基金项目(编号:40872074)

摘　　要：白牛厂银多金属矿床位于滇东南多金属成矿带中部,该矿床的银、锡、铅、锌储量达到了大型—超大型规模,同时伴生丰富的分散元素。由于该矿床成因争议较大,直接制约了进一步的勘探和开发。根据新开采矿段矿石矿物的硫同位素数据,系统研究了白牛厂矿床的硫同位素组成特征。结果表明:白牛厂矿床矿石矿物的δ^(34)S值分布范围较小,黄铁矿δ^(34)S值为2.5‰～4.0‰,磁黄铁矿δ^(34)S值为2.7‰～3.9‰,闪锌矿δ^(34)S值为2.9‰～4.3‰,方铅矿δ^(34)S值为1.5‰～2.3‰,黄铜矿δ^(34)S值为3.4‰～4.3‰。通过与赋矿地层中硫化物及与成因密切的花岗岩体的δ^(34)S值进行对比,显示出白牛厂矿床的硫主要由岩浆作用提供,为岩浆热液型矿床。结合个旧和都龙多金属矿床的地质研究成果进一步分析认为,在滇东南地区围绕晚白垩世花岗岩体及外缘为寻找多金属矿产的有利地段。Bainiuchang Ag-polymetallic Deposit is located at the central polymetallic ore belt of Southeast Yunnan, the associated mineral resources reserves of Ag, Sn, Pb and Zn are of the deposit are large or super large scale, and it is accompanied by abundant disperse elements.Due to the genesis of the deposit is controversial, further exploration and development are restricted.According to the S isotopic compositoin of Bainiuchang Deposit is systematically studied based on the latest s isotopic data of the ore minerals of the new mining section of the deposit.The study resuhs show that the variation scope of the δ^34S values of ore minerals of Bainiuehang Deposit is small ,δ^34S value for pyrite is from 2.5‰ to 4.0‰,δ^34S value of pyrrhotite is from 2.7‰ to 3.9‰,δ^34S value of sphalerite is from 2.9‰ to 4.3‰,δ^34S value of galena is from 1.5‰ to 2.3‰,δ^34Svalue of chalcopyrite is from 3.4‰ to 4.3‰.By the comparision of the δ^34Svalues of the sulfides from ore-hosting strata and granite, it is show that the sulfur in Bainiuchang Deposit is mainly derived from magmatism, it belongs to magmatic hydrothermal deposit.Based on recently geological study results of Gejiu and Dulong polymetllic deposits, it is show that granitoids of Late Cretaceous and its periphery area are the favorable locations for the prospecting areas for polymetllic deposit in Southern Yunnan Province.

关 键 词：银多金属矿床 硫同位素 岩浆作用 岩浆热液型矿床 找矿远景 

分 类 号：P611[天文地球—矿床学] P612[天文地球—地质学]