Experimental research on atomic diffusion in sulfide minerals and its applications to formational precesses of ore textures.

硫化物扩散研究的主要目的是：(A)利用放射性示踪技术和二次离子探针技术测量硫化物(闪锌矿、黄铁矿、黄铜矿和黄铜矿)中的铁和硫的扩散系数，从矿物物理和化学的角度解释硫化物的扩散机理；(B)了解天然矿样中的矿物学结构。在较宽的温度范围内(400-900ﾟC)进行了大量的硫化物扩散加热实验。精确测量了铁和硫在闪锌矿中的扩散速率。然而，对于黄铁矿、黄铜矿和毒砂等其他硫化物，由于原子从晶体表面蒸发而产生的粗糙，扩散实验没有成功地获得良好的扩散轮廓。铁和硫在闪锌矿中的扩散机理被汇编在一篇论文中，并提交给了《经济地质学》杂志。针对本研究的第二个目的，对一些黑子矿床矿石中的各种结构进行了定量分析。对东北地区黑岩型和夕卡岩型矿床进行了地质调查和取样。对硫化矿石的矿石结构和成分分带进行了研究，以阐明矿石的形成机制和沉积条件。此外，还利用相同的纹理分析技术研究了以下课题。Togawa安山岩熔岩中气泡的形态和分布，Yano-Shokozan叶蜡石矿床中叶蜡石晶体的大小变化，Tsukinuno本底沸石矿床中方石英形成的动力学问题，敖德萨铁陨石中微结构的形成过程。这些课题发表在研究论文中。从黑子成矿作用和热液蚀变作用的角度，对一些中新世玄武岩中气泡的形态和分布进行了初步研究。

The main purposes of this study on sulfide diffusion are as follows: (A) measurements of iron and sulfur diffusivities in sulfides (sphalerite,pyrite,chalcopyrite,and aresenopyrite) by radio-tracer techniques and secondary ion microprobe spectrometry and interpretation on diffusion mechanism of sulfides from the viewpoints of mineral physics and chemistry,(B) understanding of mineralogical textures in natural ore specimens.Large number of heating experiments for sulfide diffusion were carried out in wide range of temperatures(400- 900ﾟC). Iron and sulfur diffusion rates in sphalerite were measured precisely. However, the diffusion experiments for other sulfides such as pyrite, chalcopyrite, and arsenopyrite were not successful to obtain good diffusion profiles because of roughness by evaporation of atoms from crystal surfaces. Iron and sulfur diffusion mechanisms in sphalerite were compiled in a paper and are submitted to the Journal of Economic Geology. For the second aim of this study, various kinds of textures in ores from some kuroko deposits are quantitatively analyzed. Geological surveys and sampling were carried out for ore deposits of Kuroko and skarn-types in Tohoku district. Ore textures and compositional zonation in sulfide ores are investigated to clarify the formational mechanisms of ores and depositional conditions. Furthermore, following topics are studied by the same texture analysis technique. Morphology and distribution of vesicles in the Togawa andesite lava, size variation of pyrophyllite crystals in the Yano-shokozan pyrophyllite deposits,Kinetic aspects of cristobalite formation in the Tsukinuno benthonite deposit,formational processes of microtextures in the Odessa iron meteorite. These topics were published in research papers. Preliminary results are obtained for morphology and distribution of vesicles in some Miocene basalts from the standpoints of kuroko mineralization and hydrothermal alteration processes.