Fromation mechanism and origin of gold-silver deposits in Japan

日本金银矿床的形成机制及成因

• 批准号: 62540616
• 负责人: SHIKAZONO Naotatsu
• 金额: $ 1.22万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62540616/
• 关键词: Ore deposits; vein-type deposits; gold; stable isotope; Water; rock interaction; Gold deposits; 金鉱床; 生成機構; 黒絋鉱床

Gold-silver vein-type deposits in Japan can be divided into two types;epithermal-type and hypo/mesothermal type.Chemical environments and origins for epithermal and hypo/mesothermal types were estimated based on the studies of ore and gangue minerals, fluid inclusions,wall rock alteration and stable isotopes. Differences is these characteristic features for these two types were clarified. These characteristic features for these two types were compared with those for the other types (Kuroko-type, Skarn-type). This comparison suggests that these deposits can be divided into two types, sulfide-rich and sulfide-poor deposits. Sulfide-rich deposits were formed under the shallower environment than sulfide-poor deposits.

根据矿石和脉石矿物、流体包裹体、围岩蚀变和稳定同位素研究，将日本金银脉型矿床划分为浅成低温热液型和浅成中温热液型两种类型，并对浅成低温热液型和浅成中温热液型矿床的化学环境和成因进行了评价。不同之处在于对这两种类型的这些特征进行了阐明。并与其它类型（黑矿型、矽卡岩型）的特征进行了比较。这一对比表明，这些矿床可分为两种类型，富硫化物和贫硫化物矿床。富硫化物矿床的形成环境比贫硫化物矿床浅。