| 柴达木盆地北缘新生代构造变形的物理模拟 |
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| 关键词:Qaidam Basin Cenozoic structure physical modeling sandbox experiment |
| 基金项目:中国石油天然气集团公司中青年创新基金项目(CX199-06) |
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| Physical Modeling of the Cenozoic Deformation in Northern Qaidam Basin |
| Three types of sandbox models with contractive substrate and one without contractive substrate were employed to study the deformation mechanism of Cenozoic structures in northern Qaidam Basin. The results indicate that the models with contractive substrate are characterized by the development of rearward - vergent thrusts. When the models were compressed from opposite directions, the development of forward - vergent thrusts was similar to that of rearward-vergent thrusts, whereas in the models with asymmetric compression the rearward-vergent thrusts were more developed, especially on the side with higher compression speed. In the models compressed only from one direction, rearward-vergent thrusts were well developed, while forward-vergent thrusts were rarely seen. These facts show that substrate contraction and asymmetric compression can facilitate the development of rearward-ver-gent thrusts. A comparison of the experimental results with actual sections in northern Qaidam Basin suggests that substrate contraction and asymmetric compression are probably responsible for the distinctive structures in this region, and the Cenozoic deformational structures must have resulted from the asymmetric lateral compression, mainly from Qilian Mountain, with the participation of substrate contraction. |
| ZHOU Jian-xun,YU Feng-ying,ZHU Zhan-jun.2003.Physical Modeling of the Cenozoic Deformation in Northern Qaidam Basin[J].Acta Geoscientica Sinica,24(4):299-304. |
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