| 辽宁白云金矿床某些基本问题探讨 |
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| 引用本文：.1999.A discussion on some major problems of the Baiyun gold deposit, eastern Liaoning[J].Mineral Deposits,18(3):219~225 |
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| 中文摘要:白云金矿产于辽宁省东部辽东裂谷增生地体内的辽河群古元古代变质岩系中，矿体主要赋存在呈东西向展布的滑脱构造带，蚀变分带明显，与金矿化密切相关的蚀变作用为钾长石化、绢云母化、碳酸盐化、绿泥石化等，为构造蚀变岩型金矿床。均一法测温结果的主要范围为200~250℃，氢、氧、硫同位素表明成矿溶液以岩浆水为主。矿物流体包裹体、硫同位素等地球化学特征研究表明沸腾作用是矿液沉淀的主导因素。 |
| 中文关键词:金矿 滑脱构造 沸腾作用 辽东 |
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| A discussion on some major problems of the Baiyun gold deposit, eastern Liaoning |
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| Abstract:The Baiyun fractured alteration type gold deposit occurs in metamorphic rocks of Proterozoic I,iaohe Group within Liaodong rifted accreting terrane, eastern Liaoning. The orebodies are hosted by the EW- striking detachment structure zone . There exists alteration zoning in this deposit, which consists of quartz-K-feldspar altered rock zone, K feldspathized zone and decolorized zone (sericitization+carbonation+chloritization ) in the cross section. In the vertical direction quartz-K-feldspar altered rocks mainly consist of K-feldspar in the depth and quartz as well as subordinate K-feldspar in the shallow part. The alterations related to gold mineralization are K-feldspathization, sericitization, carbonation and chlorirization. The homogenization temperatures of fluid inclusions vary mainly in the range of 200~250℃. Studies on hydrogen, oxygen and sulfur isotopic composition suggest that the ore-forming solution was mainly derived from magma. The δ34S values of sulfide are +5‰～+6.5‰ in dikes associated with gold mineralization. Theδ34S values of sulfides in gold ores and altered wall rocks are respectively +3.3‰～-8.5‰ and +10‰!+17‰. Based on studies of mineral fluid inclusions and sulfur isotopic composition, it is concluded that boiling played an important role in gold deposition. |
| keywords:Gold deposit, detachment structure, boiling, eastern Liaoning |
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