摘要
据岩石组合、基本层序特征 ,结合生物化石鉴定和同位素测年结果 ,红柳河地区海西期物质建造由红柳河群海相碎屑岩、碳酸盐岩、火山岩建造和陆相磨拉石建造组成 ,主期变形形成主干褶皱———红柳河向斜及伴生构造 ,变形机制为纵弯褶皱作用兼具一定压扁特点 ,总挤压收缩率达 40 %～ 70 % ,反映了造山后强烈陆内收缩变形特点。构造演化时限为 35 6～ 2 5 6Ma。
According to the lithologic correlation,the feature of basic sequence,fossil assemblages and isotope assaying ,mass formation within Hercynian period in Hongliuhe area is composed of Hongliuhe Group made up of detrial and volcanic rocks of marine facies , carbonate and continental molasse.The tectonic framework of this period is characterized by Hongliuhe syncline by the NEE trend and associated structure which resulted from longitudinal fold mechanism with flatting feature. The total compressed ratio ranges from forty to seventy percent.These information reflects the intensified intraplate contract deformation .The tectonic evolution began in 356 Ma and ended in 256 Ma. [
出处
《西安工程学院学报》
2000年第1期18-22,共5页
Journal of Xi'an Engineering University
基金
国土资源部1:5万红柳河幅芦苇井幅区调项目
关键词
红柳河地区
海西期
构造演化
The boundary between Gansu and Xinjiang
Hongliuhe group
Hercynian period
tectonic evolution
