吉林省新生代火山岩及其构造环境

• 作 者: 方文昌
• 机 构: 吉林省地质局区域地质调查大队,
• 出 处: 吉林地质
• 发表日期: 1983年02期
• 关键词: 火山岩带 构造环境 火山活动 石英粗面岩 北东向构造 中心式 大陆边缘 伊通 欧亚大陆 格架

吉林省地处欧亚大陆板块的东部边缘。从白垩纪开始,研究区北东向构造渐渐由压性兼左旋变为引张运动,从而导致以继承中生代构造格架为特征的断裂继续活动和加强,促成新生代大陆边缘裂谷——断裂活动带的构造环境。伴随岩浆上拱作用,研究区出现了依兰——伊通、敦化——密山两大断裂为主的近北东向平行分布的裂隙——中心式火山岩带。火山活动产物为一套碱性橄榄玄武岩——拉斑玄武岩——石英粗面岩组合。

Jilin Province is located on the eastern edge of the Eurasian Plate. From the Cretaceous, the northeastern structure of the study area gradually changed from compressive and leftward to extensional movement, which led to the continuation and strengthening of the faults characterized by the Mesozoic tectonic framework, leading to the Cenozoic continental rift-rift Structure of the activity zone. Along with the magmatic arching, there are fissure-center volcanic zones in the study area parallel to the nearly NE direction, mainly consisting of Yilan-Yitong and Dunhua-Mishan faults. The volcanic activity is a combination of basic olive basalt - tholei basalt - quartz mafic rocks.