吉林省近代火山的特征及成因讨论

吉林省近代火山分布广泛,数量较多,有近10个火山群,数百座火山锥,均是新近纪中新世至全新世火山活动的产物。火山岩石为碱性（含钾高）玄武岩及其相同成分的火山碎屑岩,并含幔源包体。喷发类型从溢流式至猛烈式,其次尚有一种特殊类型——侵出式。火山成因受板内大陆深大断裂的控制,并与大洋板块自中生代以来向西俯冲的运动影响有关。

Characteristics and genesis of the recent volcanoes in Jilin Province

The recent volcanoes in Jilin Province are widely distributed, including near to 10 volcanic clusters and hundreds volcanic cones, which are the products of volcanic activities from Miocene epoch of Neogene system to Holocene epoch. The volcanic rocks are alkaline basalt （With high potassium） and pyroclastic rocks with the same composition, and with mantle - derived enclosures. There are overflow, wild flow and intrusive eruptive types in the study area. The volcanic genesis is controlled by the intraplate deep fault which affect oceanic plate underthrust to the westward since Mesozoic.