| 滇西腾冲大硐厂铜-铅-锌矿床的辉钼矿Re-Os同位素定年 |
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| 引用本文：.2005.Re-Os isotopic dating of molybdenite from Datongchang copper_lead_zinc deposit in Tengchong area, western Yunnan[J].Mineral Deposits,24(6):663~668 |
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| 基金项目:国家重点基础发展规划“973”项目（2002CB412600） |
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| 中文摘要:在环绕印度—亚洲大陆碰撞形成的东构造结波密—腾冲弧形构造带中，发育一组含锡铅_锌_铜多金属矿床，但一直没有准确的成矿年龄数据。文章通过对大硐厂铅_锌矿区红沟岩铜矿体中辉钼矿的Re_Os同位素测试，获得精确的成矿等时线年龄为(118.0±2.4) Ma。区内与成矿关系密切的斑岩成岩年龄在143～112 Ma，认为斑岩成岩与成矿同期，同为燕山晚期。 |
| 中文关键词:地球化学 Re-Os同位素定年 块状硫化物 叠加成矿 大硐厂铜-铅-锌矿床 云南腾冲 |
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| Re-Os isotopic dating of molybdenite from Datongchang copper_lead_zinc deposit in Tengchong area, western Yunnan |
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| Abstract:In Bomi_Tengchong arcuate tectonic belt of the eastern tectonic knot formed by Indian_Asian continental collision, lots of stanniferous lead_zinc_copper polymetallic ore deposits are well developed. Their metallogenic ages, however, were not accurately determined. The Re_Os isotopic dating of molybdenite from the Honggouyan copper ore body has yielded the precise ore_forming isochron age of （118.0±2.4） Ma. The porphyries closely related to the ore_forming process in this area have rock_forming ages of 143～112 Ma, suggesting that the petrogenesis and mineralization of the porphyries are of the same epoch, i.e., Early Yanshanian. It is held that, in the melted granite (porphyry) body within the thickened part of the collisional crust, the hydrothermal system rich in ore_forming fluids were superimposed upon the massive sulfide bed and caused its enrichment, thus forming the ore deposit. |
| keywords:geology Re-Os isotopic dating of molybdenite massive sulfide superimposition mineralization Datongchang copper_lead_zinc deposit in Tengchong |
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