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当前,火成岩的定名常采用国际地科联推荐的Streckeisen双三角图(Q-A-P-F)投影的方法.双三角形的顶点Q、A、P、F代表岩石中的石英、碱性长石、斜长石和副长石类矿物(霞石、白榴石、方钠石).有石英出现的岩石投入Q-A-P三角围内,有副长石类矿物出现的岩石投入F-A-P三角图内,再根据命名区间确定岩石的名称.对于颗粒较粗的深成岩,上述矿物含量可以实际测出,而在颗粒微细的斑岩及火山岩中,只有依靠岩石化学成分计算.常用计
At present, the igneous rock is often named by the International Association for the Study of Streckeisen Double Triangulation (QAPF) projection. The vertices of the double triangles Q, A, P and F represent the quartz, alkali feldspar, plagioclase and vice Feldspar minerals (nepheline, leucite, sodalite). Quartz appears in the QAP Triangle rock, rocks with ancillary feldspar minerals into the FAP triangle map, and then identified according to the named interval of rock For coarse particles of deep diagenesis, the above mineral content can be measured actually, and in the finely divided porphyry and volcanic rocks, only relying on petrochemical composition calculation.