Construction of an expert system for igneous petrology

建立了火成岩岩石学专家系统。利用该系统，我们可以根据岩石的地球化学数据对每种岩石进行识别。该系统由以下几个子程序组成：集成部分，用于控制和管理各种文件；数据库部分，用于系统地维护和控制数据；图形部分，用于在必要时显示图形和区分数据；数据映射部分，用于在地图上显示原始数据或二次数据；数据处理部分，用于利用这些数据进行各种数据处理和模型计算。建立了利用相机和摄像机拍摄的岩石结构和结构判别系统，根据岩石地球化学数据的特点，建立火成岩数据库，为判别各岩组的归属和成因奠定了基础。利用X射线荧光光谱、光子活化和电感耦合等离子体质谱对火成岩的常量元素和微量元素进行了分析，建立了数据基础。分析样品包括本州东北部新近纪火山岩、本州中部第四纪火山岩、索拉奇群白垩纪火山岩、古近纪岛曼托群火山岩和墨西哥火山带第四纪火山岩等。然后，利用该系统对不同类型的火成岩进行了判别工作，并公布了部分结果。

An expert system for the igneous petrology was constructed. We can discriminate each rock by this system based on the geochemical data. This system is composed of subprograms as follows ; the integrated part where various files are controlled and are managed, the data base part where the data are maintained and controlled systematically, the graphics part to display graph if necessary and to discriminate the data, the data mapping part where the original data or the secondary data are displayd on map, and, the data processing part where various data processings and the model calculations are done by using these data. Also, the discrimination system for the textures and the structures of the rocks taken by using the camera and the video camera was constructed.It is necessary to construct the data base of igneous rockes for the discrimination of the belonging group and the origin of the each rock group based on the characteristic of the geochemical data. We made a data base for the analytical data of major and trace elements of igneous rockes which we have analyzed by XRF,photon activation, and ICP-MS.The analyzed samples are various igneous rocks collected from various places such as Neogene volcanic rocks from Northeast Honshu arc, the Quaternary volcanic rocks from Central Honshu, and the Cretaceous volcanic rocks from ther Sorachi group, volcanic rocks of Paleogene Shimanto group, and the Quaternary volcanic rocks from the Mexican volcanic belt. Then, the discrimination works were done by using this system about those various igneous rocks, and a part of the results was published.