| 刘光智.西秦岭寨上金矿床地球化学特征
及成因机制研究[J].地质与勘探,2009,45(2):27-37 |
| 西秦岭寨上金矿床地球化学特征
及成因机制研究 |
| Geochem ica l Character istics and GeneticModel of the Zha ishangGold Deposits inWest Qinling |
| 投稿时间：2008-07-12 修订日期：2008-10-16 |
| DOI： |
| 中文关键词: 氢、氧同位素 碳、氧同位素 硫同位素 稀土元素 流体包裹体 |
| 英文关键词: Hydrogen and Oxygen isotopes, Carbon and Oxygen isotopes, sulfur isotope, rare earth elements, fluid inclusions |
| 基金项目: |
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| 中文摘要: |
| [摘要]寨上金矿床共发现金矿脉22条,金矿体19条。通过氢、氧同位素分析得出:该区成矿流体水
具有多来源特征。δ34 S的组成特点可能反映了硫源为岩浆硫和地层硫的混合。碳的来源主要由海相沉积碳
酸盐岩经溶解作用和花岗岩岩浆热液提供。矿石稀土元素并没有完全继承围岩的特征。成矿流体具有以下
特征:成矿流体为中低温、低盐度、低密度、多期次活动的流体。金矿成矿是在300Ma之后燕山晚期形成的。
成矿热液中,金主要以硫化物配合物的形式迁移。成矿流体与围岩发生充分的物质交换后,运移到裂隙发育
部位,并因为流体的混合和围压突然降低,成矿流体产生强烈的沸腾作用,使成矿物质沉淀富集成矿。 |
| 英文摘要: |
| Abstract:22 gold veins and 19 orebodieswere discovered in the Zhaishang gold deposits. The hydrogen and oxygen isotop ic geochemistry indicate
that ore - forming fluids have a multi - sources. δ34 S composition reflects a mixed sulfur source from both magma and country rocks. The main source of
carbon was p rovided by the dissolution ofmarine carbonate sediments and also the granitemagma and hydrothermal. Rare earth elements from Ores did not
entirely inherit the characteristics of the country rocks. Ore - forming fluids have the following features: medium to low temperature, low - salinity, low -
density, multi - phases of fluid activity. Gold mineralization formed in the late Yanshanian Period later than 300Ma. Gold elements were carried in the
form of sulfide comp lex and migrated into the fractures after full exchange between ore - forming fluids and surrounding rock. Because of the fluid mixing
and sudden reduces in p ressure, the ore - forming fluids had a strong boiling which results the deposition of gold. |
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