福建浦城叶家山破火山群构造特征及其形成机制探讨

近年来的最新调研成果表明，叶家山破火山群由７个破火山和１个层状火山（喷发中心）所组成，各火山机构相互叠置，与卫星ＴＭ遥感影象解译成果相吻合。火山作用经历了６个阶段的火山喷发，周围发育有环状、放射状断裂和岩脉、岩墙，是省内较为典型的破火山群机构，是寻找火山岩非金属矿的有利部位。火山活动的构造环境为拉张环境，物质来源于地壳。

Discussion on the Formation Mechanism and Structural Characteristics of the Caldera Group in Yejiashan, Pucheng County, Fujian Province

his paper focuses on discussion of the formation mechanism and structural characteristics of the caldera group in Yejiashan, Pucheng County. The Yejiashan caldera group consists of seven calderas and one stratified volcano (eruptive center), in which the volcanic apparatus are superimposed each other and which coincides with the results of the satellite photograph interpretation. The Yejiashan caldera group, for which there were six stages of volcanic eruptions, developes ring-like and radiating fratures, vein and dikes. It is one of typical caldera groups in Fujian Province and a favourable place of prospecting nonmetallic ore deposits in volcanic rocks. It is inferred that the tectonic environment of the volcanic activity is an ex tension and that the material of the volcanoes is derived from the crust.