摘要
新疆天山地区下石炭统出露广泛且与下伏地层多呈角度不整合接触,如西部北天山的大哈拉军山组,中部中天山的马鞍桥组及东部南天山的甘草湖组均与下伏地层呈角度不整合接触。显然,这是一个区域性角度不整合。两套地层间的角度不整合是鉴别造山运动的直接标志之一,此不整合可能暗示了古天山洋在早石炭世前已经闭合碰撞造山并进入陆内伸展演化阶段。
The Lower Carboniferous strata outcropped in the most of Tianshan mountains in China , and most of them are in contact with underlying strata by unconformability of dip, such as Dahalaljunshan Formation in west ,which belongs to north Tianshan tectonics , Maanqiao Formation in middle, which belongs to middle Tianshan tectonics, Gancaohu Formation in east,which belongs to south Tianshan tectonics and so on . They are all in this way distinctly , it is a kind of zonal unconformility of dip, and always regarded as a directly sign to appraise orogeny , so it probably imply us that the Paleozoic ocean had closed and collided before Early Carboniferous. From that time , Tianshan has come into continental activity .
出处
《西北地质》
CAS
CSCD
2005年第1期26-30,共5页
Northwestern Geology
基金
中国地质调查局综合研究项目(200313000063)
关键词
天山
石炭纪
角度不整合
Tianshan mountains
Carboniferous
unconformility of dip