HAL : insu-00528171, version 1

DOI : 10.1016/j.jseaes.2010.09.007

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Journal of Asian Earth Sciences 42, 5 (2011) 1048-1065

Cooling paths during the Mesozoic Extensional Tectonics of NE China: example from the South Liaodong Peninsula Metamorphic Core Complex

Wei Lin 1, Patrick Monié 2, Michel Faure 3, Urs Schärer 4, Yonghong Shi 5, Nicole Le Breton 3, Qingchen Wang 1

(2011)

The South Liaodong Peninsula massif is the easternmost Mesozoic Metamorphic Core Complex, recognized in Eastern China. It provides a good example of the combination of ductile shearing, synkinematic plutonism and polyphase exhumation. The Jurassic granodioritic plutons, located at the footwall of the detachment normal fault, and dated here at ca 160 Ma, recorded two different phases of cooling. A slow cooling regime of about 3-10°C/my prevailing before 122 Ma, was followed by a significant increase in cooling rate of about 40-55°C/my after that time. By contrast, a single fast cooling path was recorded by the Cretaceous monzogranite situated in the footwall of the detachment normal fault. This result indicates that the Jurassic and Cretaceous plutons recorded different exhumation processes: a Jurassic slow or negligible exhumation and a Cretaceous fast one assisted by normal faulting. These two cooling stages correspond to distinct geodynamic processes during the Jurassic and Cretaceous. Extensional tectonics seems not significant before Early Cretaceous. The second stage, dominated by an extensional regime which develops after ca 120 Ma, is tentatively correlated to the lithosphere removal of the North China Craton.

1 :	State Key Laboratory of Lithospheric Evolution
	Institute of Geology and Geophysics, Chinese Academy of Sciences
2 :	Géosciences Montpellier (GM)
	CNRS : UMR5243 – Université Montpellier II - Sciences et techniques
3 :	Institut des Sciences de la Terre d'Orléans (ISTO)
	Université d'Orléans – CNRS : UMR6113 – Université François Rabelais - Tours – INSU
4 :	Géoazur (GEOAZUR)
	Université Nice Sophia Antipolis [UNS] – CNRS : UMR6526 – Institut de recherche pour le développement [IRD] – Observatoire de la Côte d'Azur – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI
5 :	Department of Geology
	University of Technology

domaine

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Planète et Univers/Sciences de la Terre/Tectonique Sciences de l'environnement/Milieux et Changements globaux

mots-clés : Metamorphic Core Complex – Cooling paths – Radiometric ages – Crustal extension – Lithospheric removal – North China Craton

insu-00528171, version 1

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Contributeur : Nathalie Pothier <>

Soumis le : Lundi 25 Octobre 2010, 10:13:34

Dernière modification le : Jeudi 6 Octobre 2011, 11:15:53