一种粗粒的，深成的或侵入的长英质成分的火成岩，含石英、长石和云母的粗大晶体。
A coarse-grained, plutonic or intrusive igneous rock of felsic composition having large crystals of quartz, feldspar and mica.
深成火成岩石，有明显的晶体纹理。
在塔中地区，影响平均速度的主要因素是地层埋深和火成岩的岩性。
In Tazhong Area, the main factor of impacting average velocity is the depth of stratum and lithology of igneous.
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