论文部分内容阅读
四、主要由副长石、长石組成的(碱性) 火成岩的四面体空間投影分类图解含副长石及长石和仅含副长石的火成岩称为碱性岩。碱性岩的产出虽少,其分布面积不超过全部火成岩的1％;但由于矿物组分复杂,岩性变化较大,特定的岩石名称竟占全部岩石名词的35％左右。因此,碱性岩的分类及命名问题,从来就是一个麻烦的事情。
4. The tetrahedron spatial projection classification of (basic) igneous rocks, mainly composed of ancillary rocks and feldspar, shows that the igneous rocks containing ancillary feldspar and feldspar and the ancillary feldspar only are called alkaline rocks. Although the output of alkaline rocks is small, its distribution area does not exceed 1% of the total igneous rocks. However, the specific rock names account for about 35% of the total rock nodules because of complex mineral components and large changes in lithology. Therefore, the classification and naming of alkaline rocks has always been a troublesome thing.