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Article: Thermochronological constraints on two-stage extrusion of HP/UHP terranes in the Dabie-Sulu orogen, east-central China

TitleThermochronological constraints on two-stage extrusion of HP/UHP terranes in the Dabie-Sulu orogen, east-central China
Authors
KeywordsContinental collision
Dabie orogen
Exhumation
Geochronology
HP-UHP rocks
Tectonic extrusion
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tecto
Citation
Tectonophysics, 2011, v. 504 n. 1-4, p. 25-42 How to Cite?
AbstractAlong the Qinling-Dabie-Sulu orogenic belt in China crops out the world's largest terrane composed of ultrahigh-pressure (UHP) metamorphic rocks. Differences in the timing and mechanisms of oceanic and continental subductions are assumed to be responsible for different ages of high-pressure (HP) and UHP slices in different parts of the belt. The western part of the Dabie orogen (western Dabie terrane) holds a key to understanding of the transition from oceanic to continental subduction. This paper reports geochronological results to test a two-stage tectonic model for the exhumation of HP/UHP rocks in western Dabie. This model involves two different stages and types of extrusion for exhumation of the HP/UHP rocks in east-central China. Mica Ar/Ar ages, ranging from 241 to 231. Ma, indicate a general middle Triassic cooling probably driven by early upward extrusion during the collision between the North and South China Blocks. Late Triassic-Early Jurassic cooling was associated with later eastward extrusion, ranging from 200 to 184. Ma. The second event is recorded also in mica in the region that was not affected by later deformation and magmatism. The lateral movement along lithosphere-scale faults resulted in the eastward extrusion of the HP-UHP metamorphic terrane, which was followed, in the Late Triassic-Early Jurassic time, by a major compressive event. These two extrusion events are correlative with the two stages of Triassic exhumation of the western Dabie HP-UHP rocks, respectively. Wintin the framework of the Qinling-Dabie-Sulu orogenic belt, it is suggested for western Dabie that the subduction/exhumation of blueschist-facies unit is related to the Mianlue suture, whereas the subduction/exhumation of HP/UHP eclogite-facies units is related to the Shangdan suture. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139172
ISSN
2015 Impact Factor: 2.65
2015 SCImago Journal Rankings: 1.971
ISI Accession Number ID
Funding AgencyGrant Number
National Natural Science Foundation of China41072152
Major State Basic Research Development Program of China2009CB825006
Funding Information:

This research was supported by National Natural Science Foundation of China (Grant no. 41072152) and the Major State Basic Research Development Program of China (2009CB825006). We thank Zheng Yongfei, Alfredo Camacho and Prof. Liu Jingbo for fruitful discussions. We also thank other partners including Zhou Gaozhi, Xue Huaimin, Qian Cunchao and Lu Rukui for assistance during the fieldwork. Especially we thank Academician Yong-Fei Zheng, Prof. J.G. Liou, Prof. Yuejun Wang and one anonymous reviewer for their critical comments, constructive suggestion and improvements.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, Sen_HK
dc.contributor.authorKusky, TMen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorLiu, Xen_HK
dc.contributor.authorWang, Len_HK
dc.contributor.authorKopp, Hen_HK
dc.contributor.authorHoernle, Ken_HK
dc.contributor.authorZhang, Gen_HK
dc.contributor.authorDai, Len_HK
dc.date.accessioned2011-09-23T05:46:20Z-
dc.date.available2011-09-23T05:46:20Z-
dc.date.issued2011en_HK
dc.identifier.citationTectonophysics, 2011, v. 504 n. 1-4, p. 25-42en_HK
dc.identifier.issn0040-1951en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139172-
dc.description.abstractAlong the Qinling-Dabie-Sulu orogenic belt in China crops out the world's largest terrane composed of ultrahigh-pressure (UHP) metamorphic rocks. Differences in the timing and mechanisms of oceanic and continental subductions are assumed to be responsible for different ages of high-pressure (HP) and UHP slices in different parts of the belt. The western part of the Dabie orogen (western Dabie terrane) holds a key to understanding of the transition from oceanic to continental subduction. This paper reports geochronological results to test a two-stage tectonic model for the exhumation of HP/UHP rocks in western Dabie. This model involves two different stages and types of extrusion for exhumation of the HP/UHP rocks in east-central China. Mica Ar/Ar ages, ranging from 241 to 231. Ma, indicate a general middle Triassic cooling probably driven by early upward extrusion during the collision between the North and South China Blocks. Late Triassic-Early Jurassic cooling was associated with later eastward extrusion, ranging from 200 to 184. Ma. The second event is recorded also in mica in the region that was not affected by later deformation and magmatism. The lateral movement along lithosphere-scale faults resulted in the eastward extrusion of the HP-UHP metamorphic terrane, which was followed, in the Late Triassic-Early Jurassic time, by a major compressive event. These two extrusion events are correlative with the two stages of Triassic exhumation of the western Dabie HP-UHP rocks, respectively. Wintin the framework of the Qinling-Dabie-Sulu orogenic belt, it is suggested for western Dabie that the subduction/exhumation of blueschist-facies unit is related to the Mianlue suture, whereas the subduction/exhumation of HP/UHP eclogite-facies units is related to the Shangdan suture. © 2011 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tectoen_HK
dc.relation.ispartofTectonophysicsen_HK
dc.subjectContinental collisionen_HK
dc.subjectDabie orogenen_HK
dc.subjectExhumationen_HK
dc.subjectGeochronologyen_HK
dc.subjectHP-UHP rocksen_HK
dc.subjectTectonic extrusionen_HK
dc.titleThermochronological constraints on two-stage extrusion of HP/UHP terranes in the Dabie-Sulu orogen, east-central Chinaen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.tecto.2011.01.017en_HK
dc.identifier.scopuseid_2-s2.0-79955472489en_HK
dc.identifier.hkuros193883en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79955472489&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume504en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage25en_HK
dc.identifier.epage42en_HK
dc.identifier.isiWOS:000291296400003-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLi, S=35248444400en_HK
dc.identifier.scopusauthoridKusky, TM=35234213100en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridLiu, X=34975560500en_HK
dc.identifier.scopusauthoridWang, L=8842240700en_HK
dc.identifier.scopusauthoridKopp, H=7005558435en_HK
dc.identifier.scopusauthoridHoernle, K=6603667492en_HK
dc.identifier.scopusauthoridZhang, G=35085644800en_HK
dc.identifier.scopusauthoridDai, L=36174941600en_HK
dc.identifier.citeulike8789445-

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