滇东南薄竹山菖蒲塘钨锡多金属矿床地质特征及成矿模型  

Geologic Features and Metallogenic Model of Sn-w-polymetallic Ore Deposit in Changputang,Bozhu Mountain,Southeast Yunnan

作　　者：吴道文 张世涛[1] 张磊[1] 胡金[1] 赵宇 Wu Daowen;Zhang Shitao;Zhang Lei;Hu Jin;Zhao Yu(Faculty of Land Resource Engineering, Kunming University of Sciences 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：《科技通报》2019年第5期21-29,共9页Bulletin of Science and Technology

基　　金：国家自然科学基金(619220090006)

摘　　要：滇东南薄竹山菖蒲塘钨锡多金属矿床位于薄竹山花岗岩体西南侧,矿体主要产于岩体与寒武系地层的接触带,部分产于泥盆系地层构造发育部位,本文在对典型矿体进行地质特征分析的基础上重点进行了围岩蚀变及分带、成矿期次方面的研究,结果表明:矿化强度与不同围岩蚀变类型的叠加呈正相关性,矽卡岩化与矿化关系最为密切,通过横向和纵向的解剖,从岩体到围岩将矽卡岩依次划分为三个带:即钙铝榴石—透辉石化带→透闪石化—绿帘石化带→镁橄榄石化带,进一步查明透闪石化—绿帘石化带为矿化最强烈,可作为找矿标志。通过野外地质调查及显微研究,将矿床划分为四个成矿期:矽卡岩期→石英—硫化物期→碳酸盐—萤石期→表生期,其中矽卡岩期和石英—硫化物期为最重要的成矿期,成矿作用呈现了多阶段的特点。结合岩体地球化学、矿床流体包裹体、同位素示踪及成矿时代等方面的成果,本次工作总结了薄竹山菖蒲塘矿区的钨锡多金属矿床的成矿成因及成矿规律,并初步建立成矿模式。该模式对研究区的找矿突破和潜力评价有重要的指导意义。SN-W-polymetallic ore deposit of Changputang,Bozhu Mountain,Southeast Yunnan is located in southwest side of granitic pluton in Bozhu Mountain. The ore is mainly produced in the contact zone between rock mass and Cambrian strata. Some are produced in the development position of devonian system strata structure. This article has emphatically studied wall rock alteration and zoning,metallogenic epoch based on analyzing geologic features of typical ores. Results show that there exist a positive correlation between mineralization intensity and the superposition of different wall rock alteration types.Skarnization has close relationship with mineralization. Through transverse and longitudinal dissection,three zones on skarn can be divided from rock mass to surrounding rock: grossularite-diopside petrifaction zone, tremolite petrifaction-epidotization-forsterite petrifaction zone. Further findings show that mineralization in tremolite petrifaction—epidotization is the mote intense and it can be used as indicator for deposit. Through field geological investigation and microscopic research,mineral deposit can be divided into four metallogenic.periods:.skarn.period-quartz-sulfide period-carbonate-fluorite period-supergene period. Skarn period and quartz-sulfide period are the most important metallogenic periods,with mineralization showing multi-stage characteristics. After combing the achievements in geochemical characteristics of rock mass,fluid inclusion of mineral deposit,isotopic tracing and mineralogenetic epoch,this project has summarized the metalloqenic origin and rules of SN-W-polymetallic ore deposit in Changputang mining field,Bozhu Mountain,and preliminarily established a metallogenic model. This model is of great guiding significance for ore-search breakthroughs and potential evaluation in the research area.

关 键 词：滇东南薄竹山 钨锡多金属矿床 矿体地质特征 成矿模式 

分 类 号：P618.2[天文地球—矿床学]