摘要
盖州地区分布早元古代辽河群变质岩系,其中大面积为盖县岩组变质岩。变质岩系构造线总体呈NNW—SEE展布,主要构造线方向与岩层总体走向基本一致。辽河群变质年龄为2 000～1 900 Ma.。通过调查、分析研究,初步确状认辽河群变质岩系在吕梁期经历了三幕变形作用的改造。第一幕为伸展机制下顺层剪切变形作用;第二幕为收缩机制下挤压变形作用;第三幕为第二幕的延续。
The early Proterozoic Liaohe Group metamorphic rock system is distributed in Gaizhou region,most of where are Gaixian rock formation metamorphic rocks.Tectonic lines of metamorphic rock show NNW-SEE trending in general,direction of tectonic lines consistent with the general strike of rock stratum.Liaohe Group metamorphic age 2 000~1 900Ma.Through survey,analysis and research,initial confirm that Liaohe Group metamorphic rock system experienced the three episodic reformations by deformation action.The first one was bedding shear deformation under extensional mechanism and the second one was extrusion deformation under contractile mechanism;the third one was continuation of the second one.
出处
《吉林地质》
2012年第1期4-7,共4页
Jilin Geology
关键词
辽河群变质岩系
盖县岩组变质岩
构造线方向
变质年龄:三幕变形作用
Liaohe Group metamorphic rock system
Gaixian metamorphic rock
direction of tectonic lines
metamorphic age
the three episodic deformations
