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Article: Emeishan Basalt Ar-Ar overprint ages define several tectonic events that affected the western Yangtze platform in the Mesozoic and Cenozoic

TitleEmeishan Basalt Ar-Ar overprint ages define several tectonic events that affected the western Yangtze platform in the Mesozoic and Cenozoic
Authors
KeywordsChina Amalgamation
Collision
Longmen Shan
Tectonic Resetting
Issue Date2004
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2004, v. 23 n. 2, p. 163-178 How to Cite?
AbstractAr-Ar whole-rock dating was carried out as part of a detailed stratigraphical investigation of the Emeishan Basalt large igneous province (LIP) in the stratotype area, Sichuan, China. Thirteen (from twenty-one) specimens from three sections yielded reliable reversed isochron and plateau ages (maximum 1σ errors of ≤2.1 and 1.6 m.y., respectively), and form two clusters centered on the Late Jurassic-Early Cretaceous and Early-Late Cretaceous, with a tail spanning 82-40 Ma. However, all are appreciably younger than the magnetobiostratigraphically-constrained late Middle Permian (255-260 Ma) age of the basalts, reflecting varying degrees of thermal resetting during the Mesozoic and Cenozoic. Recently, Middle Jurassic-Early Cretaceous ages reported from elsewhere in the LIP have been used to infer a single 40 m.y.-long tectonic episode that affected the western Yangtze Platform. Developing this idea, the new information have been combined with data we hold for other parts of the terrain, and results from three Emeishan LIP Ar-Ar dating studies published during 2002, to give 32 reliable age dates. Three 10-12 m.y. events appear to be recorded in different parts of the province: Middle Jurassic, Late Jurassic-Early Cretaceous and Early-Late Cretaceous, with a fourth shorter middle Eocene episode (the 40 m.y. Mesozoic episode appears to be a sampling artifact). Following a review of the regional deformation/tectonic features, it is argued that activity related to various phases of deformation in the Longmen Shan Thrust Belt is the most likely cause of resetting. The final suturing of the North and South China blocks may have also been responsible for the Middle Jurassic event. However, the Oligocene-present indentation of India into Asia appears not to have had an impact, possibly due to the large-scale related strike-slip faults that have effectively shielded the LIP/Sichuan Basin. © 2003 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151151
ISSN
2014 Impact Factor: 2.741
2013 SCImago Journal Rankings: 1.475
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorAli, JRen_US
dc.contributor.authorLo, CHen_US
dc.contributor.authorThompson, GMen_US
dc.contributor.authorSong, Xen_US
dc.date.accessioned2012-06-26T06:17:43Z-
dc.date.available2012-06-26T06:17:43Z-
dc.date.issued2004en_US
dc.identifier.citationJournal Of Asian Earth Sciences, 2004, v. 23 n. 2, p. 163-178en_US
dc.identifier.issn1367-9120en_US
dc.identifier.urihttp://hdl.handle.net/10722/151151-
dc.description.abstractAr-Ar whole-rock dating was carried out as part of a detailed stratigraphical investigation of the Emeishan Basalt large igneous province (LIP) in the stratotype area, Sichuan, China. Thirteen (from twenty-one) specimens from three sections yielded reliable reversed isochron and plateau ages (maximum 1σ errors of ≤2.1 and 1.6 m.y., respectively), and form two clusters centered on the Late Jurassic-Early Cretaceous and Early-Late Cretaceous, with a tail spanning 82-40 Ma. However, all are appreciably younger than the magnetobiostratigraphically-constrained late Middle Permian (255-260 Ma) age of the basalts, reflecting varying degrees of thermal resetting during the Mesozoic and Cenozoic. Recently, Middle Jurassic-Early Cretaceous ages reported from elsewhere in the LIP have been used to infer a single 40 m.y.-long tectonic episode that affected the western Yangtze Platform. Developing this idea, the new information have been combined with data we hold for other parts of the terrain, and results from three Emeishan LIP Ar-Ar dating studies published during 2002, to give 32 reliable age dates. Three 10-12 m.y. events appear to be recorded in different parts of the province: Middle Jurassic, Late Jurassic-Early Cretaceous and Early-Late Cretaceous, with a fourth shorter middle Eocene episode (the 40 m.y. Mesozoic episode appears to be a sampling artifact). Following a review of the regional deformation/tectonic features, it is argued that activity related to various phases of deformation in the Longmen Shan Thrust Belt is the most likely cause of resetting. The final suturing of the North and South China blocks may have also been responsible for the Middle Jurassic event. However, the Oligocene-present indentation of India into Asia appears not to have had an impact, possibly due to the large-scale related strike-slip faults that have effectively shielded the LIP/Sichuan Basin. © 2003 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_US
dc.relation.ispartofJournal of Asian Earth Sciencesen_US
dc.subjectChina Amalgamationen_US
dc.subjectCollisionen_US
dc.subjectLongmen Shanen_US
dc.subjectTectonic Resettingen_US
dc.titleEmeishan Basalt Ar-Ar overprint ages define several tectonic events that affected the western Yangtze platform in the Mesozoic and Cenozoicen_US
dc.typeArticleen_US
dc.identifier.emailAli, JR: jrali@hku.hken_US
dc.identifier.authorityAli, JR=rp00659en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S1367-9120(03)00072-5en_US
dc.identifier.scopuseid_2-s2.0-1942473112en_US
dc.identifier.hkuros90882-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1942473112&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume23en_US
dc.identifier.issue2en_US
dc.identifier.spage163en_US
dc.identifier.epage178en_US
dc.identifier.isiWOS:000220961200002-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridAli, JR=7102266465en_US
dc.identifier.scopusauthoridLo, CH=7401771288en_US
dc.identifier.scopusauthoridThompson, GM=7403078084en_US
dc.identifier.scopusauthoridSong, X=7402269092en_US

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