摘要
括苍山巨型环形火山构造经历了至少24Ma的演化,形成了四个火山活动旋回,二十多个火山机构及其组合体。火山地质、地球物理和遥感地质信息表明,括苍山巨型环形火山构造从开始到结束一直是个隆起区,其中第Ⅱ旋回结束后的基底隆起形成了南、北两个断块和中间北东东向的仙居张性地堑,晚期(第Ⅲ旋回和第Ⅳ旋回)的火山活动明显受其控制。括苍山主峰的进一步隆起是由于下伏岩基上侵造成的,它使南断块呈一短轴背斜,同时加剧了南断块内第Ⅲ旋回的火山活动,从而造成了这一时期火山活动的南北差异。
Circular Mega Volcanic Structure in Kuocangshan experienced at least 24Ma evolution ,showing 4 volcanic activity cycles,more than twenty volcanic edifices and volcanic edifice combinations.
Data from volcanic geophysical and remote sensing geology indicate that the Circular Mega Volcanic Structure sits on a uplift duing its whole evolution. Uplift of base after the end of the Ⅱ cycle, resulted in formation of two faultblocks ,which lay in the north and south of the area, respectively, and an extension graben with NEE trend and central location controls Ⅲ and IV cycles.
The further uplift of the summit of Kuocangshan mountain resulted from the upwards intrusion of underlain batholith. Influenced by the upwards intrusion, the southern fault-block became a brechy-anticline. The volcanic activity of Ⅲ cycle was more violent, which gave rise to the differences between southern and northern volcanic activities occurred in southern and northern areas during the time.
出处
《火山地质与矿产》
1993年第4期1-11,共11页
Volcanology & Mineral Resources
关键词
火山构造
隆起
断块
浙江括苍山
volcanic structure, uplift, faultblock , Kuocangshan of Zhejiang
