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Comparative study of mineral textures in Kuroko and Sea-floor hydrothermal ore deposit

黑子与海底热液矿床矿物结构对比研究

基本信息

批准号：
04640726
负责人：
MATSUEDA Hiroharu
金额：
$ 1.28万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

The purpose of this study is to clarify the genesis of massive sulfide deposits such as Kuroko and sea-floor hydrothermal ore deposits based on the comparative study of the mineral texture. Special attentions are paid for the relationships between mineral texture and chemical compositions of sphalerite and their spatial distributions according to the microscopic observation and systematic classification of mineral textures. It has been clarified the distinct intimate relationships between both. 3-types of Kuroko ore are distinguished for the Upper black ore deposits of Matsumine mine in Akita Prefecture and their spatial distributions might be controlled by the diagenetic processes after the formation. On the other hands, detailed underground observations and systematic sampling have been done for the black ore in the satellite ore body of Kanayamazawa East, Fukazawa mine. The ore is classified into 6-types and their distributions is clarified in the ore bodey, where black ore formed on the unstable slope might be distructed and/or slided to be removed and resedimentated. Matrix-filling by chalcedonic quartz and chalcopyrite diseased textures are universally observed under the microscope. They might be caused by the continued circulation of hydrothermal water after the main ore formation. To make comparison with sea-floor hydrothermal ore deposits, microscopic observations have been made for the specimen collected from East Pacfic Rise (EPR) 13ﾟ N.There are some similarities and differences between both and the latter could be depend on the epigenetic process such as diagenesis.

通过对矿石结构的对比研究，阐明了黑矿型和海底热液型等块状硫化物矿床的成因。通过对闪锌矿矿物结构的显微观察和系统分类，着重研究了闪锌矿矿物结构与化学成分的关系及其空间分布规律。它已经澄清了两者之间的独特的亲密关系。3-秋田县松峰矿区上部黑色矿床的黑矿类型是有区别的，其空间分布可能受形成后的成岩作用控制。另一方面，对金山泽东矿卫星矿体中的黑色矿石进行了详细的地下观测和系统的取样。将矿石分为6种类型，并阐明了它们在矿体中的分布，在不稳定斜坡上形成的黑色矿石可能被破坏和/或滑动而被迁移和再沉积。在显微镜下普遍观察到由玉髓石英和黄铜矿病变结构填充基质。它们可能是主成矿后热液继续循环的结果。为了与海底热液矿床进行对比，对采自东太平洋海隆（EPR）13 ° N的样品进行了显微镜观察，发现两者既有相似之处，也有不同之处，后者可能取决于成岩作用等后生作用。