摘要
本文以香炉山破火山口为例．从火山口的构造特征、火山岩层序、火山机构等方面论述了破火山口的形成及演化。
he author studies the Xianglushan Mesozoic caldera as an example,and describes the genesis and evolution of the caldera in different aspects, such as the structure character,volcanic rock sequence and volcanic apparatus etc.
