| 江西金山金矿韧性剪切过程中物质的迁移 |
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| 引用本文：.1994.Migration of components in the ductile shearing process of the Jinshan gold deposit, Jiangxi Province[J].Mineral Deposits,13(4):371~379 |
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| 基金项目:国家自然科学基金资助项目（编号49070171） |
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| 中文摘要:金山金矿属韧性剪切型金矿床，矿床规模大，矿区发育有一套完整的糜棱岩带，在糜棱岩化过程中伴有流体相的参与。根据Gresens的成分一体积关系式所获得的计算结果表明：SiO2、FeO随着糜棱岩化程度加强而带入量增加，在地质上表现为硅化、黄铁矿化加强；Na2O与K2O表现出相反的迁移趋势，即随着糜棱岩化程度加强，Na2O迁入量增加，而K2O迁出量增加；CaO与SiO有着基本一致的变化趋势，MnO、MgO、Al2O3、P2O5、TiO2为弱迁移组分。糜棱岩化过程中的水岩比(w/R)约为1:0.013，并有大量外来水的加入。分析结果显示，Au矿化与硅化中心一致。进一步的定量计算表明，韧性剪切过程中，Au从围岩中淋失，并与外来流体所携带的Au一起，在剪切中心带富集。 |
| 中文关键词:金矿 韧性剪切带 组分迁移 江西 |
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| Migration of components in the ductile shearing process of the Jinshan gold deposit, Jiangxi Province |
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| Abstract:With a well-developed mylonite zone in the ore district, the Jinshan gold deposit is a large-sized deposit of ductile shear zone type. The mylonitization was accompanied by the addition of fluid phase. Calculations based on Gresens’ component-volume equation show that, with the intensification of mylonitization, increasing amounts of SiO2 and FeO are brought in, which is geologically expressed as intensified solidification and pyritization. Na2O and K2O exhibit the opposite trend, i. e., with the intensification of mylonithzzation, more Na2O is brought in, accompanied by the taking-out of more K2O．CaO and SiO2 have basically similar variation trend, whereas MnO, MgO, A12O3, P2O5 and TiO2 are weakly migrating components. The ratio of water to rock (W/R)in the process of mylonitization is some 1: 0.013, with the addition of significant amounts of external water.Analyses show that gold mineralization coincides with the solidification center. Further quantitative calculations demonstrate that during the ductile shearing, gold Was leached out of the wall rocks and then concentrated in the central part of the shear zone together with gold carried by the external fluids. |
| keywords:gold deposit, ductile shear zone, migration of components, Jiangxi |
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