云南建水荒田铅锌矿床矿石矿物特征及成矿期次
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摘要
虽然我国铅锌矿床在各地质时代均有分布、类型较齐全、成矿作用复杂多样,但成矿地质时代及成矿期相对集中,研究矿石矿物特征对分析矿床成因、成矿作用以及找矿工作都有一定的帮助。通过对荒田铅锌矿矿石矿物特征的系统研究表明,硫化矿中金属矿物主要为闪锌矿及方铅矿,脉石矿物主要为石英、方解石及白云石;氧化矿石中金属矿物以菱锌矿、白铅矿及异极矿为主,脉石矿物主要为石英。根据矿床地质特征、矿物共生组合以及矿物穿插交代关系等,确定了主要矿物的生成顺序,并将矿床划分为火山沉积期、热液硫化物期和表生期,其中热液硫化物期为主要成矿期,此外闪锌矿-方铅矿阶段的成矿温度为226~290℃之间,属中温热液成矿。因此,荒田铅锌矿床属火山沉积-岩浆期后热液叠加改造成因。
Although China's lead- zinc deposits are distributed in various geological age with complete type and complex mineralization,the metallogenic epoch and mineralization period are relatively centralized. Thus the study on ore mineral characteristics is of assistance for analysis of deposit genesis,mineralization and prospecting work. Through systematic study of ore mineral characteristics of Huangtian lead- zinc deposit,it is found that main metal minerals of sulfide ore are sphalerite and galena,and main gangue minerals are quartz,dolomite and calcite; main metal minerals of oxidized ore are smithsonite,hemimorphite and cerussite,and main gangue mineral is quartz. According to geological features,mineral association and mineral metasomatic relations,the generation sequence of main minerals is determined and divided into volcanic sedimentary stage,hydrothermal sulfide stage and supergene stage. Hydrothermal sulfide stage is the main mineralization stage. In addition,mineralization temperature of sphalerite- galena stage is about 226 ~ 290℃,which belongs to mineralization of middle temperature hydrothermal fluid. Therefore,Huangtian lead- zinc deposit is the result of volcanic sedimentation and postmagmatic hydrothermal transformation.
Although China's lead- zinc deposits are distributed in various geological age with complete type and complex mineralization,the metallogenic epoch and mineralization period are relatively centralized. Thus the study on ore mineral characteristics is of assistance for analysis of deposit genesis,mineralization and prospecting work. Through systematic study of ore mineral characteristics of Huangtian lead- zinc deposit,it is found that main metal minerals of sulfide ore are sphalerite and galena,and main gangue minerals are quartz,dolomite and calcite; main metal minerals of oxidized ore are smithsonite,hemimorphite and cerussite,and main gangue mineral is quartz. According to geological features,mineral association and mineral metasomatic relations,the generation sequence of main minerals is determined and divided into volcanic sedimentary stage,hydrothermal sulfide stage and supergene stage. Hydrothermal sulfide stage is the main mineralization stage. In addition,mineralization temperature of sphalerite- galena stage is about 226 ~ 290℃,which belongs to mineralization of middle temperature hydrothermal fluid. Therefore,Huangtian lead- zinc deposit is the result of volcanic sedimentation and postmagmatic hydrothermal transformation.
引文
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[6]芮宗瑶,叶锦华,张立生,等.扬子克拉通周边及其隆起边缘的铅锌矿床[J].中国地质,2004,31(4):337-345.
[7]许东,蒋成兴,王建飞.云南石屏大冷山-建水虾洞铅锌银矿找矿远景[J].云南地质,2009,28(3):243-249.
[8]吴建忠,余红平.滇东铅锌多金属矿成矿过程探讨[J].地质与勘探,2011,47(5):755-764.
[9]舒培华,杨俊,张艳韬.建水虾洞铅锌银多金属矿床成因新解[J].云南地质,2012,31(4):453-455.
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[13]王伦,黎应书,罗曦,等.云南省建水县石头寨铅锌矿床成矿条件分析[J].贵州大学学报:自然科学版,2012,29(1):58-61.
[14]刘春生,汪龙武,赵德明,等.荒田铅锌矿资源储量核实报告[R].曲靖:云南省地质矿产勘查开发局第一地质大队,2009.