| 阿舍勒铜锌块状硫化物矿床地质特征和成因 |
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| 引用本文：.1997.Geological Characteristics and Genesis of the Ashele Copper-zinc Massive Sulfide Deposit, Xinjiang[J].Mineral Deposits,16(2):97~106 |
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| 基金项目:“八五”国家科技攻关项目85-902-01-01-04专题部分研究成果 |
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| 中文摘要:阿舍勒矿床与早-中泥盆世双峰式火山活动有着成因联系，产于火山洼地中，它在喷气-沉积阶段形成，后又经历了变质改造和岩浆热液叠加。矿床具有双层结构、很好的矿化分带和蚀变分带。成矿流体的温度、压力和酸碱度等物理化学条件变化引起了围岩蚀变和矿石堆积，在海底界面上下形成了具有成因联系的两套矿化。成矿物质既来自深循环的海水，也来自岩浆热液。据此提出了深循环海水和岩浆热液的混合流体成矿模式。 |
| 中文关键词:块状硫化物矿床 矿化分带 蚀变分带 成矿模式 阿舍勒 |
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| Geological Characteristics and Genesis of the Ashele Copper-zinc Massive Sulfide Deposit, Xinjiang |
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| Abstract:The Ashele massive sulfide deposit occurs in the Ashele Devonian volcano-sedimentary basin lying on the southern margin of Altay orogenic belt. The basin was formed as a result of rift evolution on the basis of Proterozoic-Early Paleozoic continental crust, and experienced deformation of regional nappe structure. Mineralization took place at the interval between Early-Middle Devonian volcanic activities of the bimocial spilite-keratophyre volcanic suite. The deposit has two-layer structure: a massive sulfide orebody in the upper part and a disseminated sulfide orebody in the lower part. In the massive sulfide orebody there exisths vertical zonation of S-Cu, S-Cu, Zn, S-Cu, Pb, Zn-Cu, Zn, Pb, BaSO4 which is a reflection of ore accumulation sequence at the bottom of the sea. Around the disseminated sulfide orebody are well-developed wall rock alterations, which exhibit from the inside outward the zonation of sericite-quartz metasomatite chlorite-sericite metasomatite weakly hydrolytic pyroclastic rocks, suggesting characteristics of acid leaching. Studies of ore deposit geology, temperature-pressture geochemistry and stable isotope geochemistry indicate that the ore-forming fluids were composed of deeply-circulating sea water and magmatic water, and that the ore-forming materials were derived from the lower crust. ln addition, the ore-forming process has been discussed and a metallogenic model of mixed fluids comprising deeply circulating sea water and magmatic water has been established. |
| keywords:massive sulfide deposit, mineralization zoning, alteration zoning, metallogenic model, Ashele of Xinjiang |
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