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DOI | 10.1093/nsr/nwad008 |
Revisiting the mechanisms of mid-Tertiary uplift of the NE Tibetan Plateau | |
Wei, Hong-Hong; Wu, Guo-Li; Ding, Lin; Fan, Long-Gang; Li, Lin; Meng, Qing-Ren | |
发表日期 | 2023 |
ISSN | 2095-5138 |
EISSN | 2053-714X |
卷号 | 10期号:4 |
英文摘要 | Mid-Tertiary uplift of the NE Tibetan plateau is likely driven by edge convection, and this mechanism explains a wide range of prominent phenomena such as regional surface vertical motion, supracrustal extension, generation/distribution of coeval volcanism, and Late Miocene switch of tectonic regimes. Contrasting views exist on timing and mechanisms of Tertiary crustal uplift in the NE Tibetan Plateau based on different approaches, with many models attributing surface uplift to crustal shortening. We carry out a comprehensive investigation of mid-Tertiary stratigraphy, sedimentology, and volcanism in the West Qinling, Hoh Xil and Qaidam basin, and the results challenge previous views. It was held that the discordance between Oligocene and Miocene strata is an angular unconformity in the West Qinling, but our field observations show that it is actually a disconformity, indicative of vertical crustal uplifting rather than crustal shortening at the Oligocene to Miocene transition. Widespread occurrence of synsedimentary normal faults in mid-Tertiary successions implicates supracrustal stretching. Miocene potassic-ultrapassic and mafic-ultramafic volcanics in the Hoh Xil and West Qinling suggest a crucial role of deep thermomechanical processes in generating crust- and mantle-sourced magmatism. Also noticeable are the continuity of mid-Tertiary successions and absence of volcanics in the Qaidam basin. Based on a holistic assessment of stratigraphic-sedimentary processes, volcanic petrogenesis, and spatial variations of lithospheric thicknesses, we speculate that small-sale mantle convection might have been operating beneath northeast Tibet in the mid-Tertiary. It is assumed that northward asthenospheric flow was impeded by thicker cratonic lithosphere of the Qaidam and Alxa blocks, thereby leading to edge convection. The edge-driven convection could bring about surface uplift, induce supracrustal stretching, and trigger vigorous volcanism in the Hoh Xil and West Qinling in the mid-Tertiary period. This mechanism satisfactorily explains many key geologic phenomena that are hardly reconciled by previous models. |
关键词 | NE Tibetan Plateaumid-Tertiaryunconformityvolcanismedge convection |
英文关键词 | HOH XIL BASIN; APATITE FISSION-TRACK; RESOLUTION MAGNETO STRATIGRAPHY; MIDDLE MIOCENE REORGANIZATION; CENOZOIC TECTONIC EVOLUTION; NORTHERN QAIDAM BASIN; EAST-WEST EXTENSION; GARZE FOLD BELT; NORTHEASTERN MARGIN; TOPOGRAPHIC GROWTH |
WOS研究方向 | Multidisciplinary Sciences |
WOS记录号 | WOS:000946360200001 |
来源期刊 | NATIONAL SCIENCE REVIEW |
来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/283741 |
作者单位 | Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS; China Geological Survey; Institute of Geomechanics, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; University of Arizona; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS |
推荐引用方式 GB/T 7714 | Wei, Hong-Hong,Wu, Guo-Li,Ding, Lin,et al. Revisiting the mechanisms of mid-Tertiary uplift of the NE Tibetan Plateau[J]. 中国科学院青藏高原研究所,2023,10(4). |
APA | Wei, Hong-Hong,Wu, Guo-Li,Ding, Lin,Fan, Long-Gang,Li, Lin,&Meng, Qing-Ren.(2023).Revisiting the mechanisms of mid-Tertiary uplift of the NE Tibetan Plateau.NATIONAL SCIENCE REVIEW,10(4). |
MLA | Wei, Hong-Hong,et al."Revisiting the mechanisms of mid-Tertiary uplift of the NE Tibetan Plateau".NATIONAL SCIENCE REVIEW 10.4(2023). |
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