intrusive igneous rock

基本解释

Geology A body of intrusive igneous rock of which less than 100 square kilometers (40 square miles) is exposed.
岩株：一种侵入性火成岩体，少于100平方公里（40平方英里），暴露在地表外。
odict.net
A coarse-grained, plutonic or intrusive igneous rock of felsic composition having large crystals of quartz, feldspar and mica.
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。
This paper mainly deals with the petrology and geochemistry of Tertiary igneous rocks and basic intrusive rocks, and summarizes the rock types of igneous rocks and intrusive rocks.
对济阳凹陷的第三系火山岩、基性侵入岩进行了岩石学和地球化学研究，分别总结了火山岩、基性侵入岩岩石类型及其特征。