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

本研究期间于1999年引进了用于诱导耦合等离子体质谱仪（ICP-MS）的高性能ArF激光磨光设备，用于覆盖多种地质样品的分析。研究对象是矿床中某些硫化物矿物的元素、结构和扩散动力学的实验配分数据。在黄铁矿与磁黄铁矿之间进行了钴、镍的分布实验。对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进行了精确描述，从微量元素分配、晶体尺寸分布和硫化物矿物扩散的动力学过程对矿床进行了成因解释。采用ICP-MS结合激光磨蚀系统进行微量元素斑点分析（直径为100微米），获得钴和镍在黄铁矿和磁黄铁矿之间的分配值。黄铁矿和磁黄铁矿之间Co-Ni分布的合成实验表明，即使在500℃下，持续时间小于30天也不足以达到平衡状态。通过对石英和闪锌矿中直接流体包裹体的微观分析，将现场分析数据有效地应用于自然样品的地层温度地质解释。将ICP-MS分析数据与岩手县山口矽卡岩钨矿床和西太平洋马努斯盆地Desmos破火山口海底热液矿床蚀变和铜锌成矿过程化学条件的PIXE分析结果进行对比。微量元素和O、C、H稳定同位素的微量分析数据在阿曼国际地质会议上发表。

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.