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Surface uplift of the Tibetan Plateau: Constraints from isostatic effects of Cenozoic sedimentary accumulation
Journal of Asian Earth Sciences ( IF 3 ) Pub Date : 2021-01-07 , DOI: 10.1016/j.jseaes.2020.104662
Xiangjiang Yu , Zhaojie Guo

The surface uplift history of the Tibetan Plateau remains one of the most important unresolved issues in geosciences. Numerous models have been proposed to account for the growth of the Tibetan Plateau. This paper tries to analyze the surface uplift of the Tibetan Plateau from isostatic effects of the Cenozoic sedimentary accumulation. Based on isostatically-compensated basin infilling model, we show that the surface uplift magnitudes caused by the Cenozoic sedimentary accumulation constitute the main part of the modern elevations of the Qaidam and Tarim basins around the Tibetan Plateau, but only a small part of the modern elevations of the Hoh Xil and Lunpola basins inside the Tibetan Plateau. Paleogene sediments account for the uplift magnitudes of >900 m in both the Hoh Xil and Lunpola basins, while the uplift magnitudes caused by Neogene sediments are <100 m in these two basins. In contrast, the uplift magnitudes caused by Paleogene sediments in the Qaidam and Tarim basins around the Tibetan Plateau are relatively limited, whilst Neogene sediments contribute ~1100 m and ~700 m of their modern elevations respectively. It suggests that the central Tibetan Plateau was with high relief during the early Cenozoic, and its surface was successively flattened by erosion and basin-infilling processes. The initial uplift of the Tibetan Plateau occurred at the weak zones and the rigid blocks inside the Tibetan Plateau were gradually broken.



中文翻译:

青藏高原的表面隆升:新生代沉积积累等静压效应的约束

青藏高原的地表隆升历史仍然是地球科学中最重要的未解决问题之一。已经提出了许多模型来说明青藏高原的增长。本文试图从新生代沉积积累的等静压效应来分析青藏高原的表面隆升。基于等静压盆地充填模型,我们发现,由新生代沉积积累引起的地表隆升幅度构成了青藏高原周围柴达木和塔里木盆地现代高程的主要部分,但仅占一小部分青藏高原内的可可西里盆地和伦波拉盆地。在西赫尔盆地和伦波拉盆地,古近纪沉积物占隆升幅度大于900 m,在这两个盆地中,新近纪沉积物引起的隆升幅度小于100 m。相比之下,青藏高原周围的柴达木和塔里木盆地古近纪沉积物引起的隆升幅度相对有限,而新近纪沉积物分别贡献了现代海拔约1100 m和700 m。这表明青藏高原中部在新生代早期处于高起伏状态,其表面由于侵蚀和盆地充填作用而逐渐变平。青藏高原的初始隆起发生在薄弱地区,青藏高原内部的刚性块逐渐被破坏。新近纪沉积物分别贡献了现代海拔约1100 m和〜700 m。这表明青藏高原中部在新生代早期处于高起伏状态,其表面由于侵蚀和盆地充填作用而逐渐变平。青藏高原的初始隆起发生在薄弱地区,青藏高原内部的刚性块逐渐被破坏。新近纪沉积物分别贡献了现代海拔约1100 m和〜700 m。这表明青藏高原中部在新生代早期处于高起伏状态,其表面由于侵蚀和盆地充填作用而逐渐变平。青藏高原的初始隆起发生在薄弱地区,青藏高原内部的刚性块逐渐被破坏。

更新日期:2021-01-21
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