| 新疆东天山地区白山钼矿床的成因分析 |
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| 引用本文：屈文俊.2009.A genetic analysis of Baishan molybdenum deposit in East Tianshan area, Xinjia ng[J].Mineral Deposits,28(5):663~672 |
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| 基金项目:国家重点基础研究发展规划项目（2007CB411304、2001CB409800）、国家自然科 学基金项目（40772057）和安徽省优秀青年基金项目（08040106907） |
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| 中文摘要:白山钼矿床位于东天山觉罗塔格构造带的东部，赋矿围岩为下石炭统 干墩组的黑云母长英质角岩，矿化石英网脉发育。文章测得含矿石英脉中的石英流体包裹体 δ18OSMOW值为9.1‰～10.0‰，平均9.425‰，与石英相平衡的水δ18OH2O值为3.357‰～4.257‰，平均为3.682‰；δDSMOW值为-105‰～-69%， 平均-89.25‰。氢氧同位素组成显示白山钼矿床的成矿流体是岩浆水与发生了水 岩作用的 大气降水的混合热液，含矿流体以岩浆水为主，演化大气降水的加入是成矿物质沉淀的重要 因素。测得辉钼矿的Re-Os等时线年龄为（227.7±4.3）Ma（MSWD=0.32），指示白山钼矿床 形成于中三叠世。矿床地质特征和地球化学特征指示白山钼矿床是斑岩型矿床，推测成矿物 质主要来自于矿体下部的矿化花岗（斑）岩体。此外，作者还探讨了白山钼矿床的成矿背景 ，认为矿床形成于挤压的构造环境，是受到同时代古特提斯洋闭合的陆内远程效应影响而产 生的成岩成矿作用。 |
| 中文关键词:地质学 H、O同位素 Re-Os定年 成矿背景 白山钼矿床 东天山 |
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| A genetic analysis of Baishan molybdenum deposit in East Tianshan area, Xinjia ng |
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| Abstract:The Baishan molybdenum deposit is located in the eastern Jueluotag tectonic belt of the East Tianshan Mountains. The wall rocks are biotite-felsic hornstone with well-developed mineralized quartz veins, belonging to Lower Carboniferous Gandun Formation (C1g). The H, O compositions of the hydrothermal fluids in the quartz veins are as follows: δ18OSMOW values are 9.1‰～10.0‰ with an average of 9.425‰,δ18OH2O balanced with quartz are 3.357‰ ～4.257‰ with an average of 3.682‰, and δDSMOW are -105‰～ -69%, with an average of -89.25‰. Characteristics of H, O isotopes indicate that the ore-forming hydrothermal fluid was dominated by magmatic water with the participation of some evolutionary meteoric water that had experienced the water-rock interaction. The magmatic water supplied the main metallogenic materials, and the evolutionary meteoric water served as an important factor for the precipitation of the metallogenic materials. The Re-Os isochronal age of molybdenites is (227.7±4.3) Ma（MSWD=0.32）, suggesting that the mineralization of the ore deposit took place in Middle Triassic. These geological and geochemical characteristics imply that the Baishan Mo deposit is a porphyry deposit, and its metallogenic materials mainly came from deep granitic rock. This paper deals with metallogenic background, and the authors hold that the Baishan molybdenum deposit was formed in a compression environment after the post-collisional stage, and its mineralization was controlled by the distant effect of the Paleo-Tethys Ocean in Triassic. This paper has supplied a solid foundation for further researches on mineralization of granitoids which intruded into the same tectonic background in Jueluotag block as well as in East Tianshan area. |
| keywords:geology, H, O isotope, Re-Os isotopic dating, metallogenic background, Baishan molybdenum deposit, East Tianshan area |
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