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DOI10.1093/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
ISSN2095-5138
EISSN2053-714X
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
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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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