Analytical and experimental studies on partitioning of elements and diffusion kinetics in some sulfide minerals in ore deposits

1999年引进了用于感应耦合等离子体质谱(ICP-MS)的高性能ARF激光刻蚀装置，用于各种地质样品的分析。研究对象是元素分配、矿石结构和某些硫化物矿物在矿床中的扩散动力学的实验数据。针对黄铁矿与磁黄铁矿之间的微量分选，进行了钴、镍的分配实验。精确地描述了阿曼海底热液矿床矿石和塞浦路斯型铜矿矿石中某些资源矿物的矿石结构，以便从微量元素分配、晶体粒度分布和硫化物矿物的扩散性质等动力学过程来解释矿床的成因。采用电感耦合等离子体质谱(ICP-MS)和激光定标系统，对直径100微米的痕量元素进行斑点分析，得到钴、镍在黄铁矿和磁黄铁矿之间的分配值。Co-Ni在黄铁矿和磁黄铁矿之间分配的合成实验表明，短短30天的时间不足以达到平衡条件，即使是500℃。对岩手县山口矽卡岩钨矿床的钨矿床和西太平洋马努斯盆地Desmos破火山口海底热液矿床的砷蚀变和铜锌成矿作用的化学条件进行了电感耦合等离子体质谱分析数据与PIXE分析结果的比较。在阿曼举行的国际地质会议上介绍了O、C和H的微量元素和稳定同位素的微量分析数据。

High-performance ArF laser abration equipment for induced coupled plasma mass spectrometer (ICP-MS) were introduced in 1999 during this research period for analyses of covering various kinds of geological samples.Research targets are experimental partitioning data of elements, ore textures and diffusion kinetics of some sulfide minerals in ore deposits. Distribution experiment of coblat and nickel were carried out for the minor concentration between pyrite and pyrrhotite. Ore textures of some resources minerals in ores from seafloor hydrothermal ore deposits and in ores of the Cyprus-type copper deposit, Oman are precisely described for genetic interpretation of ore deposit from kinetic processes of trace element partitioning, crystal size distribution, and the diffusion nature of sulfide minerals.1. Using ICP-MS with the laser aser abration system, spot analyses of trace elements (100 micrometer in diameter) were performed for trace elemental analysss to obtain partitioning values of coblat and nickel between pyrite and pyrrhotite. Synthetic experiments for Co-Ni distribution between pyrite and pyrrhotite reveal that the short time duration of less than 30 days are not enough to achieve equilibrium conditions even 500℃.2. Spot analyses data are usefully applied to a natural samples for geological interpretation of formation temperatures by the this microanalyses of direct fluid inclusions in quartz and sphalerite.The ICP-MS analysis data are compared to PIXE analysis results for chemical conditions of mineralization processes such as tungsten deposit of the Yamaguchi skarn deposit, Iwate Prefecture and as alteration and Cu-Zn mineralization processes of seafloor hydrothermal deposits in the Desmos caldera, Manus basin, western Pacific Ocean. The microanlytical data of trace elements and stable isotopes of O, C and H were presented at the International Geological Conference in Oman.