永定五湖早侏罗世火山喷发盆地基本特征

五湖早侏罗世火山喷发盆地位于永安县东18km。构成该盆地的火山地层属藩坑组。岩石组合为玄武岩(安山岩)-流纹岩组合,属双峰式火山岩组合。火山岩相划分为爆发相、溢流相、火山通道相、潜火山相及喷发沉积相五种基本类型,并建立了相序和相组合。火山构造圈定有白叶湖崃破火山、天子山东及大雪山东层状火山,本文重点剖析了白叶湖(山东)破火山,并阐述该火山喷发盆地的发展历史。

Basic characteristics of Early Jurassic Volcanic-Eruption Basin in Wuhu, Yongding County, Fujian Province

The Wuhu early Jurassic volcanic eruption basin is located in 18 km to the east of Yongding County. The volcanic strata constituting the basin are Fangkeng Formation and their lithological association is basalt (andeside) and rhyolite, which belongs to the association of bimodal volcanic rocks. The volcanic rock phases can be divided into eruptive, overflow, volcanic conduit, cryptovolcanic and eruptive-sedimentary phase. The phase sequences and association are established. There are the Baiyehudong caldera, Tianzidong and Daxuedong stratified volcanoes outlined in the basin. The author herein concentrates on analyzing the Baiyehudong caldera and expounding the development of the volcanic eruptive basin.