摘要
本文对我国东部有名的富钾火山岩带中二克山、五大连池、科洛火山群进行了板块构造环境及火山喷发特征的研究。研究表明,本区火山活动应为大陆板块内部的裂谷环境,与消减带无关。文中还总结了火山活动的时代、规模、顺序、碎屑锥特点。研究了绳状、渣状熔岩的典型剖面、形成条件及流动方向。分析了火山碎屑物(岩)的类型、粒度及厚度。认为本区属夏威夷型及斯通博利型喷发,火山活动强度后期减弱,而爆发强度后期增大。
The Wudalianchi, Erkeshan and Kelo volcanic groups constitute a K-rich volcanic belt in eastern China. The authors synthesized geological, geophysical and geochemical data, and believe that the plate tectonic setting of the study area should belong to the rift valley within the continental plate.The volcanic rocks consist of two main lithofacies (flow facies and explosive facies).The authors made investigation on the characteristics of pahoehoe and aa lava, and the flow mechanics of the lavas.Through the statistics of the distribution of pyroclasts, the authors suggest that the volcanic eruption belongs to Strombolian type and that the eruptive strengh of the volcanoes increased in the later stage.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第3期211-220,共10页
Geological Review
