次火山岩,亦称潜火山岩或火山侵入岩。它具有熔岩状、浅成岩状及角砾熔岩状三种外貌。次火山岩的定义有狭义的和广义的两种。狭义的定义认为,次火山岩与火山岩属同一岩浆源不同相的产物,与围岩具有侵入接触关系,是一种未侵入到地表的超浅成岩体,其生成时间与火山岩大致同时,形成深度一般0.5-1.5公里。广义的次火山岩认为,它应包括火山岩浆的超浅成侵入体和火山管道岩体,后者的形成深度为0.1-0.5公里。笔者认为,按广义的涵义理解次火山岩的定义较为合适。在火山岩区进行普查找矿 Sub-volcanic rocks, also known as sub-volcanic rocks or volcanic intrusive rocks. It has lava, shallow diagenetic and breccia lava three appearances. The definition of secondary volcanic rocks is narrow and broad. Narrow definition of the view that the subvolcanic rock and volcanic rock belong to the same magma source of different phases of the product has an intrusion relationship with the surrounding rock is a non-invasive surface ultra-shallow diagenetic body, the formation time and volcanic rock roughly the same time, the formation of depth General 0.5-1.5 km. The broadly defined subvolcanic rocks suggest that it should include ultra-shallow intrusions of volcanic magma and volcanic plumbing, with a depth of 0.1-0.5 km. In my opinion, it is appropriate to understand the definition of subvolcanic rock in a broad sense. Census in the volcanic rock prospecting