气候变化领域集成服务门户(CCPortal): Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?

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DOI	10.1016/j.tecto.2020.228592
	Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?
	Chu Y.; Lin W.; Faure M.; Allen M.B.; Feng Z.
发表日期	2020
ISSN	00401951
卷号	793
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.
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
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207733
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
推荐引用方式 GB/T 7714	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],2020,793.
APA	Chu Y.,Lin W.,Faure M.,Allen M.B.,&Feng Z..(2020).Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?.Tectonophysics,793.
MLA	Chu Y.,et al."Cretaceous exhumation of the Triassic intracontinental Xuefengshan Belt: Delayed unroofing of an orogenic plateau across the South China Block?".Tectonophysics 793(2020).