摘要
塔里木西南新生代盆地经历了由海相沉积体系向陆相沉积体系的转变,沉积中心由一个向两个转变,这是受印度板块向北与欧亚板块碰撞,帕米尔与西南天山之间“阿赖海峡”的控制,以及印度板块与欧亚板块碰撞,纯挤压作用力随帕米尔突刺的不断挤入,应力在突刺二侧转换为压扭性质,分别形成恰曼左行走滑断裂系统和费尔干纳一塔拉斯右行走滑断裂.碰撞引起的造山带向塔里木板块上的大规模逆冲推覆不早于渐新世.巾自米尔一西昆仑山前的逆冲冲断带具有两端逆冲(乌帕尔一齐姆根走滑逆冲构造带)中部兼具走滑特征,喜马拉雅晚期(中新世末期),在塔西南前陆盆地内形成喀什坳陷、齐姆根凸起、叶城坳陷的初步雏形,这样的构造格局一直持续到现在.渐新世形成的底劈盐丘构造可用来确定青藏高原北缘西昆仑地区最初隆升的时间,即不早于渐新世.
Depositional system of the southwestern Tarim basin changed from marine to non-marine facies, and from one depocenter to two during the Cenozoic. This was controlled by Alai channel, which was located between Pamir and the southwestern Tianshan, and the collision between Indian plate and Eurasia plate. With the formation of Pamir tongue, the compressional stress diverted to compresso-shear, resulting in the formation of Qaman sinistral strike-slip faults and Talas-Fergana dextral strike-slip faults. Fault system in the frontal Pamir-west Kunlun area is characterized by thrusting on two sides and strike-slip in the middle. Collision-related thrusting in the foreland area of Tarim plate postdates the Oligocene. The prototype of Kashgar depression, Qimeigan salient and Yecheng depression was formed in the foreland basin of southwestern Tarim during the late Himalayan stage, i.e., late Miocene. This tectonic framework has been kept until the present time. The post-oligocene formation of diapiric salt domes implies that the initial uplift of Tibet-Qinghai plateau in West Kunlun area predates the Oligocene.
出处
《新疆地质》
CAS
CSCD
2003年第1期92-95,共4页
Xinjiang Geology
关键词
塔里木盆地
新生代
走滑-逆冲推覆构造
阿赖海峡
喀什坳陷
齐姆根凸起
叶城坳陷
southwestern Tarim basin
Cenozoic
strike-slip and thrust nappe structures
Alai marine channel
Kashgar depression
Qimeigan salient
Yecheng depression
