Cenozoic Sedimentary Migration in Qaidam Basin and Its Significance on the Dynamic Mechanism
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摘要: 新生代柴达木盆地的坳陷、沉积作用和周缘山体隆升存在着很好的耦合关系，沉积中心位置、沉积范围大小及沉积中心的平面形态有规律的变化，反映出新生代柴达木盆地承受过来自北缘祁连山方向、西北缘阿尔金山方向以及南缘昆仑山方向三组挤压应力的作用，其中来自阿尔金山方向的应力一直在持续发挥作用；来自盆地南北缘的应力也始终发挥重要作用，同时经历了一个由北东向(古近纪早—中期)→北北东向(古近纪末期—中新世早期)→近南北向(中新世中期—上新世中期)→北东向(上新世晚期)的转向过程。在此基础上建立了柴达木盆地新生代发展演化模式，提出柴达木盆地新生代经历了由北向南挤压—旋转、由南西向北东挤压—旋转以及由向北挤压—旋转的动力学演化过程。Abstract: Within the period of Cenozoic, the downwarping and the sedimentation have good relationships with the uplift of surrounding mountains. The regular change of the position, the range and the plane shape of sedimentary center indicates that Qaidam basin underwent three compressoshear stress field from the north Qilian mountain,the Altyn mountain and Kunlun mountain. The stress field from Altyn Mountain compressed continuously from the beginning to the end of Cenozoic. The stress field from northern and southern boundary also compressed continuously, and experienced a direction change history, the NESW direction(E),the NNESSW direction(E23N11) , nearly SN direction and NESW direction. So, the Cenozoic evolution pattern has been made according to which, the Qaidam Basin experienced four compressoshear stages, their directions are NESW(E),NNESSW(E23N11), nearly SN(N21N22) and NESW(N32Q).
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Key words:
- Qaidam Basin /
- Cenozoic /
- sedimentary migration /
- stress field /
- dynamic mechanism
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