权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Ore textures and mineralization processes of seafloor deposits formed by hydrothermal circulation-Comparative study of the recent seafloor hydrothermal mineralization and Kuroko-type ore deposits-

热液循环形成的海底矿床的矿石结构和成矿过程-近期海底热液成矿与黑子型矿床的比较研究-

基本信息

批准号：
07640633
负责人：
MIZUTA Toshio
金额：
$ 1.66万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Ore-forming processes were examined from the experimental results of sulfide diffusion and distribution of trace elements between solution and sulfide minerals. Then, textures of ores from some seafloor hydrothermal deposits and Kuroko deposits are quantitatively analyzed from the viewpoint of crystal-size distribution theory.1.Diffusion rates in sulfide minerals in Zn-Fe-S system and stability relationships are examined by annealing experiments using mainly Auger spectrometer. Obtained results of diffusion rates are relatively higher the activation energy is lower than previous interdiffusion studies by electron probe analyzes.2.Distribution of trace elements such as cobalt and nickel between chloride solutions and pyrite were performed by hydrothermal synthesis method. Distribution coefficients were calculated from the data of Co^<2+>/Fe^<2+> ratios in solutions and pyrite from experiments at the temperatures of 200-300ﾟC.Distribution coefficients for recent seafloor hydrothermal ores and Kuroko-type ores with mineralized solutions are estimated from the data of the obtained distribution coefficients. Cobalt distribution in minerals are confirmed as an useful tool for the considerations of ore forming processes.3.Using the apparatus purchased in this study, the size (axs, perimeters, directions of elongation, and so on) of chalcopyrite blebs are analyzed with the image processing methods. Such kinetic phenomena of 'chalcopyrite disease' were interpreted from the experimentally determined diffusion results. Diffusion time span and growth rates of chalcopyrite grains in sphalerite crystals are discussed in submitted paper to the International Journal.

根据硫化物在溶液中的扩散和微量元素在溶液与硫化物矿物之间的分布实验结果，探讨了成矿过程。然后，从粒度分布理论的角度对海底热液矿床和黑矿矿床的矿石结构进行了定量分析。1.通过退火实验，主要利用俄歇谱仪研究了Zn-Fe-S体系中硫化物矿物的扩散速率和稳定性关系。通过电子探针分析得到的扩散速率相对较高，活化能较低。2.采用水热合成法研究了钴、镍等微量元素在氯化物溶液和黄铁矿之间的分布。根据200-300 ℃温度下溶液和黄铁矿中的Co^<2+>/Fe^<2+>比值数据计算了分配系数。根据所得分配系数数据估算了近代海底热液矿石和含矿化溶液的黑矿型矿石的分配系数。钴在矿物中的分布被证实是一个有用的工具来考虑成矿过程。3.使用本研究购买的设备，用图像处理方法分析黄铜矿气泡的大小（轴，周长，伸长方向等）。从实验确定的扩散结果中解释了“黄铜矿病”的这种动力学现象。在提交给国际期刊的论文中讨论了闪锌矿晶体中黄铜矿颗粒的扩散时间跨度和生长速率。