Study of ores using ore microscope and EPMA.

本次合作研究的目的是为了协调矿石显微镜和电子探针研究人员的工作（电子探针分析仪），两者都是研究矿石的最重要的设备，并与COM通信IMA（矿石矿物委员会）电子探针研究矿石的最新进展之一是背散射电子图像的数字图像处理和大量X射线衍射图像的数字图像处理。在矿石样品区域获得的射线强度数据。后者虽然需要复杂的机械孔径和较大的计算机内存，但易于定量表示有关元素的浓度。前者的空间分辨率更精确，所需计算机内存更小，但只能在已知二元或伪二元体系的情况下进行定量计算，而最近的背散射电子灵敏探测器可以很容易地分辨出由于晶体学取向不同而引起的电子强度的微小差异，闪锌矿从热液中沉积后，由于环境的变化，闪锌矿具有抗退火的倾向。闪锌矿和闪锌矿中的杂矿结构和构造常用矿石显微镜和电子探针检测。因此，我们建议COM在1994年于意大利举行的IMA会议上开设一个关于闪锌矿遗传意义的系统会议。计算机自动或半自动EPMA被广泛使用。我们有时需要更复杂的数据处理，并需要一个个人程序的数据减少一个特定的目的。制定和修订了若干方案。

The purpose of this co-operative study is to coordinate researchers of ores using ore microscope and EPMA(Electron micro-probe analyzer), both of which are the most important facilities of the study of ores,and to correspond with COM(Commissin on Ore Minerals) of IMA(International Association of Mineralogy).One of the recent progress of EPMA study of ore is digital image processing of backscattering electron image and of a huge number of X-ray intensity data obtained at an area of ore specimen. The latter is easy to represent quantitative concentration of the elements concerned although it needs complicated mechanical aperatus and big memory in the attached computer. The former is more acurate in spatial resolution and needs smaller size in computer memory but it can be quantitatively evaluated only in the case of the known binary or pseudo-binary system.Recent sensitive detector of backscattered electron can easily discriminate minute difference in the electron intensities due to the different crystallographic orientation channelling pattern, which might puzzle inexperienecd people.Sphalerite tends to resist to annealing due to environmental change after its deposition from hydrothermal solution. Texture and structure of sphalerite and its hetrerogeneity within a grain is often detected using ore microscope and EPMA. We, therefore, propose COM to open a syposium on the genetical meaning of sphalertite at IMA 1994 meeting in Italy.Computer automated or semi-automated EPMA is widely used. We need sometimes more sophisticated treatment of the data, and need one personal program of data reduction for one specific purpose. Several programs are developed and revised.