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

硫化物矿物中原子扩散实验研究及其在矿石结构形成过程中的应用

基本信息

批准号：
02453046
负责人：
MIZUTA Toshio
金额：
$ 4.1万
依托单位：
AKITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

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.

这项研究关于硫化物差异的主要目的如下：（a）通过放射线追踪技术的硫化物（Sphalerite，Pyrite，chalcopyrite和Reesopyrite）的铁和硫差的测量，通过放射线跟踪器技术和次级离子微探针光谱仪和近代固定机构的硫化和解释（对硫化物的扩散机制）的含量和解释的测量（天然矿石标本中的质地。在广泛温度（400-900 c）中进行的硫化物差异的加热实验数量。精确测量了辉石中的铁和硫扩散速率。然而，由于晶体表面从晶体表面蒸发原子的粗糙度，因此其他硫化物（例如黄铁矿，黄铜矿和砷的扩散实验）无法获得良好的扩散曲线。在论文中汇编了闪锌矿中的铁和硫扩散机制，并提交给《经济地质杂志》。为了进行这项研究的第二个目的，对某些黑生矿床的矿石中的各种纹理进行了定量分析。在Tohoku区进行了地质调查和采样，以用于黑白矿床和Skarn类型的矿床。研究了硫化物矿石中的矿石质地和成分区，以阐明矿石和矿石条件的形成机制。此外，通过相同的纹理分析技术研究了以下主题。 Yano-Shokozan硫属矿石沉积物中含叶叶叶石晶体的尺寸变化，在Tsukinuno Benthonite沉积物中的脆性方面，Yano-Shokozan硫属地沉积物的形态和分布，在Yano-Shokozan硫属地矿床中的尺寸变化，Odessa Iron MeteeTearties Metextures的形成性过程。这些主题发表在研究论文中。从Kuroko矿化和水热改变过程的角度来看，获得了一些中新世玄武岩中蔬菜的形态和分布的初步结果。