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一、问题的提出 国际地质科学联合会火成岩分类学分会推荐了QAPF图解的分类方案(A.Streckei-sen,1979)。这一方案的长处是:各类火山岩的平均成分投影点基本上落在相应的分区内;各区火山岩的名称可以同侵入岩相对应;对于全晶质的火山岩来说,根据矿物成分命名,比做化学分析经济、简便;按矿物成分确定岩石名称,不仅可以反映成分,而且可以说明一定的形成条件,因此对该分类的这些基本方面应该予以肯定。然而,在实际的使用过程中,也遇到一些具体问题需要进一步研究解决。这些问题是:(1)“异名
I. PROBLEM ISSUES The International Association of Geological Sciences igneous classification class recommended the QAPF schema (A. Streckei-sen, 1979). The advantage of this scheme is that the projection of the average composition of each type of volcanic rock falls substantially within the corresponding subarea; the volcanic rocks in each area have the same name as the intrusive rock; for the all-crystalline volcanic rock, the mineral composition is named after It is economical and easy to do chemical analysis. Rock identification by mineral composition not only reflects the composition, but also certain formation conditions. Therefore, these basic aspects of the classification should be affirmed. However, during actual use, some specific problems are encountered and need to be further studied and solved. These questions are: (1) "Synonym