摘要
卫星图像分析显示,青藏高原腹地阿里地区存在非常清晰的大型环形构造影像,结合遥感影像及地质等特征分析,认为昂拉仁错环形构造是雅鲁藏布江断裂带、班公湖-怒江断裂带南缘分支断裂和南北向展布的多桑地堑和亚热地堑为界所围陷的环形构造。其形成是在印度板块向欧亚板块俯冲的碰撞过程中,青藏高原在总体隆升的背景下,由于岩石圈受到南北向挤压、东西向拉张的影响,张性断裂活动性增强,后期火山活动频繁,形成了由不同方向断裂、不同时期岩浆活动构成的多层环形构造。
As the most typical annular constitution in Tibet,the interpretation of satellite images reveals the existence of ANGLFRENCUO polycyclic constitution distinctly.Based on the analysis of remote sensing feature and geological feature,it is understandable that the ANGLFRENCUO polycyclic constitution locates between yaluzangbu river suture zone and the southern suture of bangonghu-nujiang suture zone,duosang fault tuough and yare fault trough.People usually think that ANGLFRENCUO polycyclic constitution is built under the squeezing between India plate and Eurasia plate.On the background of Tibet uplifting,the lithosphere is squeezed by south-north compression force,and is tension-thined by the east-west pulling force,which strengthens the activity of the extension fracture and the frequency of the magma activity.Then ANGLFRENCUO polycyclic constitution is formed.
出处
《测绘科学》
CSCD
北大核心
2007年第6期159-161,209-210,共3页
Science of Surveying and Mapping
基金
1:250000(H44C001004)西藏赛利普幅区域地质调查(200313000020)
关键词
遥感技术
环形构造
断陷盆地
昂拉仁错
西藏
remote-sensing technique
polycyclic constitution
fault trough
ANGLARENCUO
Tibet
