| 新疆望峰金矿成矿流体研究及其成因意义 |
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| 引用本文：陈衍景,李欣,靖军,高秀丽,陈华勇,吴锡丹,吴德华.1998.新疆望峰金矿成矿流体研究及其成因意义[J].地球学报,19(1):195-203. |
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| 基金项目:国家自然科学基金,国家九五攀登预选95－预－39号,国家九五攻关96-915-03-05专题,黄金部队科研项目,全国博士后基金 |
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| 中文摘要:新疆望峰金矿，产于中天山结晶基底中的韧性剪切带内。围岩蚀变和流体包裹体研究表明，成矿过程包括了３个阶段，从早到晚有石英黄铁矿阶段、多金属硫化物阶段和石英碳酸盐阶段，温度分别集中在３６０～５２０℃、２４０～３６０℃和１２０～２４０℃；矿化以第Ⅱ阶段为主。成矿流体的δ１８Ｏ值变化于１．１５‰～２．７０‰之间，属于变质热液与大气降水热液的混合流体。包裹体成分表明成矿流体来源较浅，但有利于金矿化；ＣＯ２／Ｈ２Ｏ比值多大于０．０２６，也有利于成矿。而包裹体捕获压力表明成矿作用发生在５．６～１．２ｋｍ深度范围，主要发生在１．９ｋｍ左右；矿化过程与地壳抬升伸展的过程一致，自然亦与碰撞造山体制的矿化规律一致。因此，古生代末期的碰撞造山作用导致了望峰金矿的形成，冰达坂断裂两侧是寻找望峰式金矿的有利地带。石英红外光谱分析表明，ＣＯ２光密度（Ｄ２）及其与Ｈ２Ｏ光密度（Ｄ１）的比值（Ｄ２／Ｄ１）普遍较高，指示矿化较强；Ｄ２＞０．５５和Ｄ２／Ｄ１０．２６是该区富金样品的标志。 |
| 中文关键词:望峰金矿成矿流体包裹体成矿作用碰撞造山作用 |
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| Study of Oreforming Fluid for the Wangfeng Gold Deposit of Xinjiang and Its Genetic Implication |
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| Abstract:The Wangfeng gold deposit,Xinjiang Autonomous region,ranked as a medium one,was located in a ductile shearing zone within the Central Tianshan crystalline basement.Studies on wall rock alteration and fluid inclusions show that the oreforming process includes three stages which are marked by the mineral assemblages of quartz_pyrite,polymetallic sulfides, and quartz_carbonate respectively.Their mineralizing temperatures are concentrated at the ranges of 360～520℃,240～360℃,and 120～240℃ respectively.The middle stage contributed most to the mineralization.With the value of δ 18 O‰ ranging 1.15～2.70,the ore_forming fluids is most likely to be hybrid fluid by metamorphic solution and meteoric solution. Chemical composition of fluid inclusions shows that the ore_forming fluid was derived from a shallow level source and was beneficial for gold mineralization. The ratio of CO 2/H 2O is usually larger than 0.026, which is also favorable for gold mineralization. The calculated crapping pressure of inclusions demonstrates that the mineralization should occur at the depth of 5.6～1.2 km, mainly at about 1.9 km. The oreforming process concedes with the crustal extension elevation, consequently agrees with the mineralization during collisional orogenesis. Hence, the collision orogenesis at the end of Paleozoic result in the formation the Wangfeng gold deposit; and more gold deposits like Wangfeng maybe found along the Bingdaban fault belt. Infrared spectroscopic analysis of quartz shows that the densities of absorption spectra for CO 2 ( D 2) and the ratios of D 2 over the densities for H 2O ( D 1) ( D 2/ D 1) are generally high, which suggests the mineralization should have been strong. D 2>0.55 and D 2/ D 10.26 are indicators to gold enriched samples. |
| keywords:Wangfeng gold deposit oreforming fluid inclusion mineralization collision orogenesis |
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