滇西勐糯铅锌矿床流体包裹体研究及矿床成因探讨  

Study on Fluid Inclusions and Genesis of Mengnuo Lead-zinc Deposit in Western Yunnan

作　　者：邢永辉[1] 缪发金 吴文贤[2] 马云良 张岐能 杨积转 XING Yonghui;MIAO Fajin;WU Wenxian;MA Yunliang;ZHANG Qineng;YANG Jizhuan(Yunnan Institiute of Geology and Mineral Resources Exploration,Kunming 650051,Yunnan,China;China Geological Survey Military-civilian Integration Geological Survey Center,Chengdu 610036,Sichuan,China;The Fourth Geological Brigade of Yunnan Bureau of Geology and Mineral Resources,Baoshan 678000,Yunnan,China)

机构地区：[1]云南省地质矿产勘查院,云南昆明650051 [2]中国地质调查局军民融合地质调查中心,四川成都610036 [3]云南省地矿局第四地质大队,云南保山678000

出　　处：《矿产综合利用》2025年第1期16-29,共14页Multipurpose Utilization of Mineral Resources

基　　金：滇西保山地块西缘金多金属矿成矿规律及找矿方向研究;中国地质大调查项目(DD20243091);云南永昌铅锌股份有限公司勐糯矿区及外围综合研究与找矿预测(1908YCQX-ZYB11)。

摘　　要：勐糯铅锌矿是保山(地块)Pb-Zn-Cu-Fe-Hg-Sb-As-Au成矿带内的大型铅锌矿床,该矿床的成因存在沉积-改造型、喷流沉积型(SEDEX)、热液型矿床(MVT)等不同观点。本文对勐糯铅锌矿床中方解石、石英、重晶石、闪锌矿开展流体包裹体研究,以探讨该矿床成矿流体来源及矿床成因。结果显示,该矿床整个成矿期的均一温度服从正态分布,众数为170~280℃,为中低温;成矿流体盐度为4.03%~12.73%NaCl,属于低盐度的不饱和成矿流体;整个成矿期的流体密度主要为0.778~0.978 g/cm^(3),显示中等密度特征;成矿流体以CO_(2)、H_(2)O为主要成分的低盐度、中等密度流体。结合矿床地质特征、同位素地球化学特征等方面的研究,认为勐糯铅锌矿床应为与侵入岩浆地质作用有关的中低温热液型铅锌矿床。The Mengnuo Pb-Zn deposit is a large Pb-Zn one in the Pb-Zn-Cu-Fe-Hg-Sb-As-Au metallogenic belt of Baoshan(block).There are different views on the genesis of the deposit,such as sedimentary-reworked type,exhalative sedimentary type(SEDEX)and hydrothermal type deposit(MVT).In this paper,the fluid inclusions of calcite,quartz,barite and sphalerite in Mengnuo lead-zinc deposit are studied to explore the source of the ore-forming fluid and the genesis of the deposit.The results show that the homogenization temperature of the whole metallogenic period of the deposit obeys the normal distribution,and the mode is 170~280℃,which is medium and low temperature.The salinity of the ore-forming fluid is 4.03%~12.73%NaCl,which belongs to the low salinity unsaturated ore-forming fluid.The fluid density of the whole metallogenic period is mainly 0.778~0.978 g/cm^(3),which shows medium density characteristics.The ore-forming fluid is low-salinity and medium-density one with CO_(2) and H_(2)O as the main components.Combined with the study of geological characteristics and isotopic geochemical characteristics of the deposit,it is considered that the Mengnuo lead-zinc deposit should be a medium-low temperature hydrothermal lead-zinc deposit related to intrusive magmatic geology.

关 键 词：流体包裹体 成矿流体 中低温热液型 勐糯铅锌矿床 滇西 

分 类 号：TD952[矿业工程—选矿] P618.42[天文地球—矿床学]