| 云南东南部都龙锡石一硫化物型矿床的成矿特征 |
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| 引用本文：.1989.Ore-formlng characteristics of the Dulong cassiterite-sulfide type ore deposit in southeastern Yunnan[J].Mineral Deposits,8(4):29~38 |
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| 中文摘要:都龙锡矿床是中国三大锡矿基地之一——滇东南老君山锡、钨多金属成矿区中最大的矿床。矿体产在老君山花岗岩体外接触带寒武纪地层中，属锡石一硫化物型多金属矿床。除产Sn外，还伴生有Zn、Ag、Cu、Fe等有用组分。本文通过对成矿物质来源、戍矿控制因素和物
理、化学条件等方面的研究，对以往的层控观点提出了异议，认为矿床的锡质主要来源于第一期花岗岩，第二期花岗岩与叠加在锡石硫化物矿床之上的铜矿化有关；矿质的运移和沉淀主要受控于断裂、裂隙构造及围岩的岩性；成矿流体以温度高(300—400℃)、盐度低(5．5wt．％NaCl), 密度小(0.9—1.0g/cm3)及富含挥发组分等为特征；矿床成因类型属岩浆期后高温热液矿床。 |
| 中文关键词:滇东南 都龙锡矿床 成矿特征 |
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| Ore-formlng characteristics of the Dulong cassiterite-sulfide type ore deposit in southeastern Yunnan |
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| Abstract:The Dugong tin deposit is the largest Sn, W polymetaltic deposit in Laojunshan. Southeastern Yunnan and is aJso one of the three large tin bases in China. The deposit is of cassiterite-sulfide polymetallic type which occurs within Cambrian strata in contact with the Laoiunshan granite intrusion. In addition to the main element Sn, it contains such associated recoverabJe elements as Zn, Ag, Cu and Fe. The main ore types include cassitel ite-sulfides, cassiterite-silicates and cassiterite—magnetite．with the cassiterite disseminated in micrograined form(generally<74μm)in the ore. Based on researches on sources of ore-forming elements, ore-controlling factors and physical-chemical conditions for metallogenesis.The author holds that tin was derived from Laojunshan granite jnstead of from the strata, that the migration and deposition of metallogenic elements were controlled by faults, fissures and lithological Characters of the wall rocks and that the ore deposit was formed in a physical-CheInical environment where ore-forming fluids had high temperature(3000-400℃), low salinity(5.5NaCl wt％)and density(0.9一1.0g?cm3)and contained lots of volatiles such as fluorine, thus belonging to the deuteric hypothermal type. The Laojunshan granite, being a crustal anatectic granite intruded in Yanshanian Period with isotopic age 89—118Ma, contained abundant tin(even reaching 70ppm)and thus served as the ore-forming parent rock providing excellent background for metalIogeIlesis. |
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