鄂尔多斯盆地—高原转型期区域动力学背景

通过分析新生代以来亚洲板块与周邻板块运动学特征、鄂尔多斯盆地区域构造应力场变化及盆地抬升的 地质学证据,探讨鄂尔多斯盆地—高原转型期的地球动力学机制。研究结果表明,新生代以来鄂尔多斯盆地— 高原转型期的驱动力主要源于印度板块北移、青藏高原隆升和太平洋板块向西俯冲产生的远源波及力。鄂尔多 斯盆地抬升的时期主要分为:新生代早期(65～45、45～25)MaBP,盆地处于缓慢阶段性抬升期;新生代晚期(25 ～0.78、0.78)MaBP,盆地处于快速阶段性抬升期,且抬升的频次有逐渐加大的趋势。

Dynamic Mechanism of Transition from Basin to Plateau in Ordos

Through analyzing the kinematical characteristics of Asian plate and its adjacent plates during Cenozoic Era, the change of tectonic stress field and the geological evidences of uplift in Ordos Basin, and the dynamic mechanism of the transition from basin to plateau are discussed. It is thought that the driving force for transision from basin to plateau in Ordos during the Cenozoic were derived from the long-source affecting force of the northward movement of Indian plate, the uplift of Tibetan plateau and the westward subduction of Pacific plate. The uplift of Ordos Basin was divided into four stages. During the early period of Cenozoic(65～ 45 Ma BP and 45 ～ 25 Ma BP), Ordos Basin was featured by slow staggered-uplifting. During the late period of Cenozoic(25～ 0.78 Ma BP and 0.78 Ma BP to present), Ordos Basin was featured by rapid staggered uplifting. The frequency of uplifting in Ordos Basin tends to increasing gradually.