中文摘要：

为了探明新生代火山岩的形成原因,以日本中国地区中央部的鸟取县中部、兵库县北西部和高清水黑岩高原地区的新生代火山岩为对象,通过岩相学研究、电子探针X射线微区分析试验、荧光X射线仪全岩化学分析试验,研究其岩石学特征.通过比较中国地区中央部的松江地区、鸟取县东部新生代火山岩的岩石主要化学成分,分析其异同点;根据松江地区、鸟取县东部的新生代火山岩类的比较结果,讨论日本中国地区新生代火山岩的岩石成因,认为：火山岩浆在上升过程中,在岩浆演化晚期阶段,与围岩发生了同化混染作用,使得最终凝固结晶形成的火山岩化学成分发生了变化.

英文摘要：

In order to study genesis of Cenozoic volcanic rocks of Chugoku District in Japan,Cenozoic volcanic rocks of middle part of Totori county,north-west part of Hyouko county,and Takashimizukuroiwa altiplano in central of Chukogu district in Japan,were selected as research objects.The petrological characteristics were studied by facieology study,electron probe X-ray microanalysis,and X-ray fluorescence whole rocks chemical constituent analysis.Furthermore,they were compared with Cenozoic volcanic rocks of Matsue area and east part of Totori.And the difference was analyzed.After compared with main chemical constituents of Cenozoic volcanic rocks of Matsue area and east part of Totori,the genesis of Cenozoic volcanic rocks of Chukogu district in Japan was discussed.It was considered that magma had an assimilation-fractional crystallization action with surrounding rock in the later period of magma evolution during a magma rising process,and it made chemical constituents of volcanic rocks changed.