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Article: Two-stage Triassic exhumation of HP-UHP terranes in the western Dabie orogen of China: Constraints from structural geology

TitleTwo-stage Triassic exhumation of HP-UHP terranes in the western Dabie orogen of China: Constraints from structural geology
Authors
KeywordsContinental subduction
Dabie orogen
HP-UHP rocks
Structural geology
Tectonic extrusion
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tecto
Citation
Tectonophysics, 2010, v. 490 n. 3-4, p. 267-293 How to Cite?
AbstractAbundant exposures of widely-distributed HP-UHP metamorphic rocks in the western part of the Dabie orogen enable us to study the tectonic evolution of HP-UHP terranes associated with the world's largest preserved continental subduction zone. Previous tectonic models for the Dabie orogen were based largely on metamorphic studies, most of them lacking significant structural constraints. We present a comprehensive structural analysis based on detailed structural geology. The results suggest that syn-UHP (D0 at 241-231. Ma) and syn-HP (D1 at 225-215. Ma) southeast-vergent thrusting formed a series of stacked structural slices. This was followed by southeast-vergent folding under amphibolite facies conditions (D2 at 215-205. Ma); then a third generation of flexural folding occurred at shallow levels (D3 at 200-184. Ma). This leads us to proposes a two-stage Triassic exhumation model in which initially rapid vertical extrusion (D0-D1) from UHP to HP conditions to lower crustal levels is followed by slow southeastward extrusion (D3) from lower crustal levels to the Earth's surface. The tectonic model combines the early southeastward vertical extrusion with the later southeastward lateral extrusion, revealing two different stages and thus different types of Triassic extrusion for the exhumation of HP-UHP rocks in the Dabie orogen. The first stage extrusion occurred in the Middle Triassic, whereas the second stage extrusion lasted from the Late Triassic to Early Jurassic. These two extrusion episodes correlate with the two stages of Triassic exhumation of the Dabie HP-UHP rocks, respectively, during continental collision. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/139191
ISSN
2015 Impact Factor: 2.65
2015 SCImago Journal Rankings: 1.971
ISI Accession Number ID
Funding AgencyGrant Number
Major State Basic Research Development Programs of China2009CB825006
program for New Century Excellent Talents in UniversityNCET-06-0595
Ministry of Education of China NSFC90814011
40472098
40776038
Geological Investigation Project of China200013000169
National Natural Science Foundation of China40821061
Ministry of Education of ChinaB07039
Funding Information:

This research was supported by the Major State Basic Research Development Programs of China (2009CB825006), the program for New Century Excellent Talents in University (NCET-06-0595) of the Ministry of Education, Nos. 90814011, 40472098 and 40776038 of China NSFC, and Geological Investigation Project (200013000169) of China Geological Survey. Additional funding was provided by the National Natural Science Foundation of China (Grant 40821061) and the Ministry of Education of China (B07039). We thank other partners including Dr. Qian Cunchao, Dr. Liu Jianming, Prof. Zhou Gaozhi, Prof. Tang Jiafu, Dr. Xue Huaimin, and Dr. Lu Rukui for assistance during the fieldwork. Especially we thank Profs. Zheng Yong-Fei, Lin Wei and three anonymous reviewers for their encouragement and constructive evaluation.

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.authorZhang, Gen_HK
dc.contributor.authorKopp, Hen_HK
dc.contributor.authorWang, Len_HK
dc.date.accessioned2011-09-23T05:46:30Z-
dc.date.available2011-09-23T05:46:30Z-
dc.date.issued2010en_HK
dc.identifier.citationTectonophysics, 2010, v. 490 n. 3-4, p. 267-293en_HK
dc.identifier.issn0040-1951en_HK
dc.identifier.urihttp://hdl.handle.net/10722/139191-
dc.description.abstractAbundant exposures of widely-distributed HP-UHP metamorphic rocks in the western part of the Dabie orogen enable us to study the tectonic evolution of HP-UHP terranes associated with the world's largest preserved continental subduction zone. Previous tectonic models for the Dabie orogen were based largely on metamorphic studies, most of them lacking significant structural constraints. We present a comprehensive structural analysis based on detailed structural geology. The results suggest that syn-UHP (D0 at 241-231. Ma) and syn-HP (D1 at 225-215. Ma) southeast-vergent thrusting formed a series of stacked structural slices. This was followed by southeast-vergent folding under amphibolite facies conditions (D2 at 215-205. Ma); then a third generation of flexural folding occurred at shallow levels (D3 at 200-184. Ma). This leads us to proposes a two-stage Triassic exhumation model in which initially rapid vertical extrusion (D0-D1) from UHP to HP conditions to lower crustal levels is followed by slow southeastward extrusion (D3) from lower crustal levels to the Earth's surface. The tectonic model combines the early southeastward vertical extrusion with the later southeastward lateral extrusion, revealing two different stages and thus different types of Triassic extrusion for the exhumation of HP-UHP rocks in the Dabie orogen. The first stage extrusion occurred in the Middle Triassic, whereas the second stage extrusion lasted from the Late Triassic to Early Jurassic. These two extrusion episodes correlate with the two stages of Triassic exhumation of the Dabie HP-UHP rocks, respectively, during continental collision. © 2010 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 subductionen_HK
dc.subjectDabie orogenen_HK
dc.subjectHP-UHP rocksen_HK
dc.subjectStructural geologyen_HK
dc.subjectTectonic extrusionen_HK
dc.titleTwo-stage Triassic exhumation of HP-UHP terranes in the western Dabie orogen of China: Constraints from structural geologyen_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.2010.05.010en_HK
dc.identifier.scopuseid_2-s2.0-77955013702en_HK
dc.identifier.hkuros193923en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955013702&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume490en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage267en_HK
dc.identifier.epage293en_HK
dc.identifier.isiWOS:000281001300011-
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.scopusauthoridZhang, G=35085644800en_HK
dc.identifier.scopusauthoridKopp, H=7005558435en_HK
dc.identifier.scopusauthoridWang, L=35575221300en_HK
dc.identifier.citeulike7263819-

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