镜泊湖全新世火山喷发特征

Characteristics of the Holocene Volcano in the Jingpohu Region

本文概述镜泊湖全新世火山机构,并对其喷发类型、喷发方式及火山碎屑基浪堆积等特征进行讨论,指出镜泊湖全新世火山属于单成因火山;从喷发方式上看,它不属于中心式喷发,而是裂隙式喷发;火山碎屑基浪堆积的发现,否定了以往人们将火山渣层中花岗岩碎屑的成因认定是外动力地质作用的结果,指出它是玄武质岩浆遇水爆炸的产物,火山渣与花岗岩碎屑层之间不存在所谓“沉积间断”。这对恢复镜泊湖全新世火山活动历史,确定火山口周围环境有重要意义。

This paper described composition, eruption mode, genesis and characteristics of the Holocene volcano in the Jingpohu region, discussing characteristics of volcanic debris basic-surfing. The Jingpohu Holocene Volcano is single genesis volcan0;it is not central eruption, it is crevice eruption; the discovery of volcanic debris basic-surfing negate the recognize of the people consider granite debris layer reflect “dispositional break”, whereas it is a result of basalt lava meet water. There is important for recover history of the Jingpohu Holocene Volcanic and conclude environment of crater.