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

矿床中某些硫化物矿物的元素分配和扩散动力学的分析和实验研究

基本信息

批准号：
11440157
负责人：
MIZUTA Toshio
金额：
$ 9.66万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

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.

本研究期间于1999年引进高性能ArF激光烧蚀设备诱导耦合等离子体质谱仪（ICP-MS），用于覆盖各类地质样品的分析。研究目标是元素、矿石结构和扩散动力学的实验分配数据。对部分资源的黄铁矿和磁黄铁矿结构中的少量富集物进行了钴、镍的分布实验。精确描述了海底热液矿床矿石和阿曼塞浦路斯型铜矿床矿石中的矿物，以便从微量元素分配、晶体尺寸分布和硫化物矿物扩散性质的动力学过程对矿床进行成因解释。 1使用ICP-MS和激光烧蚀系统，对微量元素（直径100微米）进行点分析，以获得微量元素的分配值。黄铁矿和磁黄铁矿之间钴和镍的合成实验表明，即使在500℃下，短时间的持续时间也不足以达到平衡条件。2．通过对石英和闪锌矿中的直接流体包裹体进行微分析，对地层温度进行地质解释的天然样品。ICP-MS 分析数据与岩手县山口矽卡岩矿床钨矿床等成矿过程化学条件以及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矿化过程的PIXE分析结果。在阿曼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。