DOI: 10.1016/j.epsl.2020.116451
论文题名: Late Triassic uplift, magmatism and extension of the northern North China block: Mantle signatures in the surface
作者: Meng Q.-R. ; Wu G.-L. ; Fan L.-G. ; Wei H.-H. ; Wang E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547 语种: 英语
中文关键词: denudation
; extension
; Late Triassic
; magmatism
; mantle upwelling
; North China block
英文关键词: Metamorphic rocks
; Basin development
; Decompression melting
; Depositional setting
; Driving mechanism
; Extensional deformation
; Metamorphic core complex
; North China blocks
; Spatial variations
; Tectonics
; denudation
; extensional tectonics
; magmatism
; mantle structure
; petrogenesis
; subduction
; tectonic setting
; Triassic
; uplift
; China
; Mongol-Okhotsk Fold Belt
; North China Block
英文摘要: The Late Triassic saw a period of broad uplift, vigorous magmatism and supracrustal stretching in the northern North China block, but the driving mechanism has been uncertain. Previous investigations have mostly dealt with individual tectonic processes, such as petrogenesis of igneous complexes, extensional deformations, or basin development, and the proposed models were aimed to account for some specific processes. This study makes a holistic treatment of Late Triassic denudation, magmatism, and rift basins in an attempt to unravel the driver for these coeval tectonic processes. Late Triassic uplift is registered by a regional disconformity separating Jurassic from Lower–Middle Triassic or older units, and Upper Triassic oligomict conglomerates are suggestive of early-stage peneplanation. The extensive uplift of the northern North China block was also accompanied by the development of the Great Ordos basin in the southern North China block, which exhibits striking southward variation from alluvial/fluvial through deltaic to lacustrine depositional settings. Vigorous magmatism is typified by mantle-sourced alkaline and mafic complexes distributed in an east–west narrow belt. The development of metamorphic core complex and some isolated rift basins is clearly indicative of crustal extension. Spatial variation from coeval island-arc calc-alkaline to backarc bimodal magmatism in the Amurian superterrane hints at southward subduction of the Mongol-Okhotsk plate. All the geologic records point to the plausibility that these synchronous tectonic processes must have been genetically linked and were likely induced by southward subduction of the Mongol-Okhotsk plate. Here, we argue that the Mongol-Okhotsk plate subduction not only triggered arc and backarc magmatism in the Amurian superterrane, but also led to decompression melting and focused upwelling of the upper mantle ahead of the subducting slab beneath the northern North China block. The Late Triassic intraplate extensive uplift, magmatism, and extension in the northern North China block are accordingly interpreted as the signatures of the focused mantle upwelling. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165160
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences, Beijing, 100029, China; Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, China
Recommended Citation:
Meng Q.-R.,Wu G.-L.,Fan L.-G.,et al. Late Triassic uplift, magmatism and extension of the northern North China block: Mantle signatures in the surface[J]. Earth and Planetary Science Letters,2020-01-01,547