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首页> 外文期刊>Journal of Asian earth sciences >Sedimentary characteristics of Cenozoic strata in central-southern Ningxia, NW China: Implications for the evolution of the NE Qinghai-Tibetan Plateau
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Sedimentary characteristics of Cenozoic strata in central-southern Ningxia, NW China: Implications for the evolution of the NE Qinghai-Tibetan Plateau

机译：宁夏中南部新生代地层的沉积特征：对东北青藏高原演化的启示

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摘要

Cenozoic sedimentary deposits in central-southern Ningxia province, NW China are an important record of Tertiary tectonic events along the evolving Qinghai-Tibetan Plateau's northeast margin. Shortly after the onset of the Indo-Eurasia collision to the south, a thrust belt and adjoining foreland basin began to form during 40-30 Ma. The Eocene Sikouzi Formation developed in a distal setting to this basin, in normal fault-bound basins that may have formed in a forebulge setting. Subsequent deposition of the Oligo-cene Qingshuiying Formation occurred during a phase of apparently less intense tectonism and the previous underfilled foreland basin became overfilled. During the Early Miocene, contractional deformation was mainly distributed to the west of the Liupan Shan. This resulted in deformation of the Qingshuiying Formation as indicated by an unconformity with the overlying Miocene Hongliugou Formation. The unconformity occurs proximal to the Haiyuan Fault suggesting that the Haiyuan Fault may have begun movement in the Early Miocene. In the Late Miocene, thrusting occurred west of the southern Helan Shan and an unconformity developed between the Hongliugou and Qingshuiying Formations proximal to the the Cha-Gu Fault. Relationships between the Miocene stratigraphy and major faults in the region imply that during the Late Miocene the deformation front of the Qinghai-Tibetan Plateau had migrated to the Cha-Gu Fault along the western Ordos Margin, and the Xiang Shan was uplifted. Central-southern Ningxia was then incorporated into the northeast propagating thrust wedge. The driving force for NE propagation of the thrust wedge was most likely pronounced uplift of the northeastern plateau at the same time. Analysis of the sedimentary record coupled with consideration of the topographic evolution of the region suggests that the evolving fold-and-thrust belt experienced both forward-breaking fold-and-thrust belt development, and out-of-sequence fault displacements as the thrust wedge evolved and the foreland basin became compartmentalised. The documented sedimentary facies and structural relationship also place constraints on the Miocene-Recent evolution of the Yellow River and its tributaries.
机译：中国西北地区宁夏中南部的新生代沉积物，是沿不断发展的青藏高原东北缘第三纪构造事件的重要记录。在印度-欧亚大陆向南碰撞发生后不久，在40-30 Ma期间开始形成一条逆冲带和相邻的前陆盆地。始新世四口子组在该盆地的远端发育，可能是在前隆形成的正常断层限定盆地发育。随后，低构造的青水营组沉积发生在一个构造强度明显减弱的阶段，而先前未充填的前陆盆地变得充填了。中新世初期，收缩变形主要分布在六盘山以西。如上覆中新世红柳沟组不整合所表明的，这导致了清水营组的变形。不整合面发生在海原断层附近，表明海原断层可能已在中新世早期开始运动。在中新世晚期，冲断作用发生在贺兰山南部以西，查古断裂附近的红柳沟组与清水营组之间形成了不整合面。中新世地层与该地区主要断层之间的关系表明，在中新世晚期，青藏高原的变形前缘已沿着鄂尔多斯边缘的西部迁移到了查古断裂，而香山隆升了。然后，将宁夏中南部纳入东北传播的逆冲楔块。推力楔向NE传播的驱动力最有可能在同一时间明显上升到东北高原。对沉积记录的分析以及对该地区地形演变的考虑表明，演化的褶皱冲断带既经历了前折褶皱冲断带的发展，又经历了断层错位位移作为逆冲楔的情况演变，前陆盆地变得分隔。文献记载的沉积相和构造关系也限制了黄河及其支流的中新世近代演化。

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