| 长埔锡矿床成矿流体性质与演化 |
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| 引用本文：马秀娟.1995.长埔锡矿床成矿流体性质与演化[J].地球学报,16(4):386-396. |
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| 全文下载次数: 2013 |
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| 中文摘要:长埔矿区矿物中流体包裹体十分丰富，主要有液相包裹体、气相包裹体、含液态ＣＯ＿２多相包裹体以及含子矿物多相包裹体。成矿作用阶段大致可分为锡石－石英－电气石阶段，锡石－硫化物阶段以及无矿石英阶段。各阶段叠加现象明显，３个阶段从早到晚温度、盐度有从高变低的趋势。矿区成矿温度范围１６０－４１０℃，最佳温度２２０－３４０℃，盐度为２－１６Ｗ＿（Ｎａｃｌ）％，压力为３０－４５ＭＰａ，相当于成矿深度１．２－１．８ｋｍ。成矿流体主要来自于岩浆热液，晚期有大气降水的影响。流体沸腾温度为２６９．２℃，压力为１２．５ＭＰａ，深度为０．５ｋｍ。 |
| 中文关键词:成矿流体 锡矿床 长埔 |
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| The Characters and Evolution of Minerogenetic Fluids of Changpu Tin Deposits |
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| Abstract:The study of the fluid inclusions of Changpu tin deposits indicates that the minerals in the de-posits are rich in fluid inclusions. They include liquid inclusions ,gaseous inclusions , multi-phase in-clusions involving liquid CO2 , and multi-phase inclusions involving daughter minerals. The miner-alization can be divided into three stages : cassiterite-quartz-tourmaline stage , cassiterite-sulfidesstage ,and barren quartz stage,Fromearly stage to late one both the temperature and the salinityreveal a decreasing trend , but the overlapping phenomenon is obvious.In this area the minerogenet-ic temperature range is from 160℃to 410℃; the optimum temperature range is 220-340℃; thesalinity range is 2-16WNaCl%. The mineralization pressure is 30-45 MPa , which coresponds tominerogenetic depth of 1.2-1.8km. The mineralization thermal liquids came mainly from magmafluids , and at the late stage they were influenced by meteoric water. The boiling temperature of thefluids may be 269.2℃; the pressure :12.5Mpa; the depth :0.5km. |
| keywords:ore-forming fluids tin deposits Changpu |
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