DOI: 10.1016/j.tecto.2020.228592
论文题名: Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?
作者: Chu Y. ; Lin W. ; Faure M. ; Allen M.B. ; Feng Z.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 793 语种: 英语
中文关键词: Cretaceous extension
; Delayed exhumation
; Mesozoic plateau
; South China
; Thermochronology
; Xuefengshan
英文关键词: Sea level
; Structural geology
; Temperature
; Continental collision belts
; Crustal shortening
; Crustal thickenings
; Crustal thickness
; Intense deformation
; Paleo-Pacific subductions
; South China block
; Subduction zones
; Tectonics
; collision zone
; continental collision
; convergent margin
; Cretaceous
; crustal thickening
; exhumation
; orogenic belt
; plate tectonics
; subduction zone
; tectonic setting
; Triassic
; China
; South China Block
英文摘要: A large plateau can be produced by crustal thickening in convergent zones such as continental collision belts and Andean-type subduction zones, but the life cycles of such plateaux are not well-understood. In particular, it is not clear how long they persist after construction, before other tectonic processes or erosion reduce crustal thickness and elevation to near-normal levels. Triassic subduction- and collision-tectonics produced intense deformation, magmatism and metamorphism across the entire South China Block. This large-scale crustal shortening created a broad orogenic belt, uplifted most parts of the South China Block, and probably initiated the growth of an orogenic plateau. Our study presents low-temperature thermochronology data from the Xuefengshan Belt in the interior of the South China Block. There was along-strike variation in exhumation. The north orogenic core was subjected to Triassic (~245–210 Ma), and Late Cretaceous (~100–80 Ma) exhumation, whereas the cooling path of the south orogenic core reflects a two stage Cretaceous evolution. The variable exhumation pattern reflects non-uniform tectonics in different regions, but both regions were subject to Late Cretaceous extension. We tentatively reconstruct the original plateau paleo-elevation to be ~1.5 km above sea level, based on the amount of exhumation (~10 km) and the present crustal thickness (~35 km). The T-t trajectories of the Xuefengshan Belt and other Triassic belts highlight the significance of Cretaceous extension and exhumation in shaping the tectonic configuration of the South China Block. Large-scale extension was probably triggered by rollback of the Paleo-Pacific subduction zone. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170567
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, Institutions of Earth Sciences, Chinese Academy of Sciences, Beijing, 100029, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; Institut des Sciences de la Terre d'Orléans, UMR 7327, Université d'Orléans, Orléans, 45071, France; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China
Recommended Citation:
Chu Y.,Lin W.,Faure M.,et al. Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?[J]. Tectonophysics,2020-01-01,793