Study of ores using ore microscope and EPMA.

这项合作研究的目的是利用矿石显微镜和电子探针分析仪(EPMA)协调矿石研究人员，这两种仪器都是研究矿石的最重要设备，并与国际矿物学协会(IMA)的矿石矿物委员会(COM)保持一致。电子探针研究矿石的最新进展之一是对背散射电子图像和在矿样区域获得的大量X射线强度数据进行数字图像处理。后者虽然需要复杂的机械孔道和大容量的计算机内存，但容易表示有关元素的定量浓度。前者空间分辨率更高，所需计算机内存较小，但只能在已知的二元或伪二元系情况下才能定量评估；最近灵敏的背散射电子探测器可以很容易地分辨出由于晶体取向不同而导致的电子强度微小差异，这可能会困扰经验丰富的人；闪锌矿从热液中沉积后，由于环境变化，往往会抵抗退火。闪锌矿的结构和结构以及其在颗粒中的非均质性通常用矿石显微镜和电子探针来研究。因此，我们建议COM在1994年意大利IMA会议上召开关于闪锌矿遗传意义的研讨会。计算机自动或半自动EPMA被广泛使用。我们有时需要对数据进行更复杂的处理，并且需要一个用于特定目的的个人数据简化程序。开发和修订了几个程序。

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.