滇中暮阳铅锌矿床成矿流体性质和成矿物质来源  

Properties of ore-forming fluids and sources of ore-forming materials of the Muyang Pb-Zn deposit in central Yunnan province

作　　者：马宏斌[1] 陈欣彬 高建国[1] MA Hongbin;CHEN Xinbin;GAO Jianguo(Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学国土资源工程学院,昆明650093

出　　处：《中国科技论文》2024年第8期857-867,876,共12页China Sciencepaper

基　　金：国家自然科学基金资助项目(41272111)。

摘　　要：为了揭示暮阳铅锌矿成矿流体特征和成矿物质来源,在总结分析前人成果的基础上,对该矿床进行了野外调查、室内显微观察、流体包裹体测温、激光拉曼光谱分析和铅同位素的研究,并取得了如下主要认识:矿物中的包裹体形状多样,其成矿作用具有多期次、多阶段性的特点,且成矿作用发生时间较为集中。流体包裹体显微测温表明:成矿流体属于中-低温(107~320℃)、低盐度(0.17%~11.14%NaCleqv)、低密度(0.65~1.02 g/cm^(3))的浅成(0.26~0.95 km)NaCl-H_(2)O体系,赋矿地层为成矿提供了流体,深部的流体也可能参与了成矿作用;铅源具有壳源和造山带特征,铅主要来源于赋矿地层与下伏地层或基底地层,同时混合了一定的深部物质;暮阳铅锌矿床在成因上属于沉积-混合热液型。In order to reveal the characteristics of ore-forming fluid and the source of ore-forming materials of the Muyang Pb-Zn deposit,field investigation,indoor microscopic observation,fluid inclusion temperature measurement,laser Raman spectrum analy-sis,and lead isotope research were carried out on the deposit based on the summary and analysis of previous achievements.The fol-lowing main understandings are achieved.Firstly,the inclusions in the minerals have various shapes,and their mineralization is char-acterized by multi-period and multi-stage,and the occurrence time of mineralization is relatively concentrated.Secondly,microther-mometry of fluid inclusions shows that the ore-forming fluid belongs to a shallow NaCl-H_(2)O system(0.26~0.95 km)with medium-low temperature(107~320℃),low salinity(0.17%~11.14%NaCleqv),and low density(0.65~1.02 g/cm^(3)).The ore-bearing strata provides fluids for mineralization,and the deep fluid may also participate in the mineralization.Thirdly,the lead source has the characteristics of shell source and orogenic belt,and the lead mainly comes from the ore-bearing strata and the underlying or base-ment strata and is mixed with some deep material.Finally,the Muyang Pb-Zn deposit belongs to the sedimentation-mixed hydro-thermal type in terms of genesis.

关 键 词：暮阳铅锌矿 流体包裹体 铅同位素 成矿流体 

分 类 号：P618.4[天文地球—矿床学]