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Article: The Pengguan tectonic dome of Longmen Mountains, Sichuan Province: Mesozoic denudation of a Neoproterozoic magmatic arc-basin system

TitleThe Pengguan tectonic dome of Longmen Mountains, Sichuan Province: Mesozoic denudation of a Neoproterozoic magmatic arc-basin system
Authors
KeywordsMesozoic denudation
Neoproterozoic magmatic arc
Pengguan tectonic dome
Issue Date2008
PublisherScience in China Press. The Journal's web site is located at http://jdxg.chinajournal.net.cn/
Citation
Science In China, Series D: Earth Sciences, 2008, v. 51 n. 11, p. 1545-1559 How to Cite?
AbstractNeoproterozoic igneous and metamorphic complexes occur as tectonic domes in the Longmen Mountains of the western margin of the Yangtze Block, and are important in reconstructing the Rodinian supercontinent and constraining the timing and mechanism of tectonic denudational processes. The Pengguan dome consists of granitic intrusions and metamorphic rocks of the Huangshuihe Group and is tectonically overlain by ductilly deformed Sinian to Paleozoic strata. The plutonic intrusions consist of granites with abundant amphibolite enclaves. New LA-ICP-MS zircon U-Pb dating yielded an emplacement age of 809±3 Ma and a protolith age of 844±6 Ma for the granite. The granitic rocks have geochemical signatures typical of A-type granites, indicating their formation under an extensional environment, by melting of newly formed tonalite-trondhjemite-granodiorite (TTG) rocks. A detachment fault, characterized by variable ductile shear deformation of S-C fabric and ESE-ward kinematics, separates the Pengguan dome from the Sinian-Paleozoic cover. 40Ar/ 39Ar dating of muscovite from the mylonite in the detachment fault of the dome demonstrates that ductile deformation occurred at ∼160 Ma. This study indicates the existence of a Neoproterozoic magmatic arc-basin system, which was denudated by a Jurassic middle crustal ductile channel flow along the Longmenshan thrust belt. © Science in China Press and Springer-Verlag GmbH 2008.
Persistent Identifierhttp://hdl.handle.net/10722/58654
ISSN
2011 Impact Factor: 1.588
ISI Accession Number ID
Funding AgencyGrant Number
NSFC40621002
MOEIRT0546
National Natural Science Foundation of China40472106
111 ProjectB07011
China Petrochemical Corporation09-01
University of Hong Kong
Funding Information:

Supported by NSFC Innovation Research Group Program ( Grant No. 40621002), MOE Innovative Research Team Program ( Grant No. IRT0546), the National Natural Science Foundation of China ( Grant No. 40472106), the "111" Project ( Grant No. B07011), the Project from China Petrochemical Corporation ( 09-01) and Committee on Research and Conference Grants of the University of Hong Kong

References

 

DC FieldValueLanguage
dc.contributor.authorYan, DPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorWei, GQen_HK
dc.contributor.authorGao, JFen_HK
dc.contributor.authorLiu, SFen_HK
dc.contributor.authorXu, Pen_HK
dc.contributor.authorShi, XYen_HK
dc.date.accessioned2010-05-31T03:34:27Z-
dc.date.available2010-05-31T03:34:27Z-
dc.date.issued2008en_HK
dc.identifier.citationScience In China, Series D: Earth Sciences, 2008, v. 51 n. 11, p. 1545-1559en_HK
dc.identifier.issn1006-9313en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58654-
dc.description.abstractNeoproterozoic igneous and metamorphic complexes occur as tectonic domes in the Longmen Mountains of the western margin of the Yangtze Block, and are important in reconstructing the Rodinian supercontinent and constraining the timing and mechanism of tectonic denudational processes. The Pengguan dome consists of granitic intrusions and metamorphic rocks of the Huangshuihe Group and is tectonically overlain by ductilly deformed Sinian to Paleozoic strata. The plutonic intrusions consist of granites with abundant amphibolite enclaves. New LA-ICP-MS zircon U-Pb dating yielded an emplacement age of 809±3 Ma and a protolith age of 844±6 Ma for the granite. The granitic rocks have geochemical signatures typical of A-type granites, indicating their formation under an extensional environment, by melting of newly formed tonalite-trondhjemite-granodiorite (TTG) rocks. A detachment fault, characterized by variable ductile shear deformation of S-C fabric and ESE-ward kinematics, separates the Pengguan dome from the Sinian-Paleozoic cover. 40Ar/ 39Ar dating of muscovite from the mylonite in the detachment fault of the dome demonstrates that ductile deformation occurred at ∼160 Ma. This study indicates the existence of a Neoproterozoic magmatic arc-basin system, which was denudated by a Jurassic middle crustal ductile channel flow along the Longmenshan thrust belt. © Science in China Press and Springer-Verlag GmbH 2008.en_HK
dc.languageengen_HK
dc.publisherScience in China Press. The Journal's web site is located at http://jdxg.chinajournal.net.cn/zh_HK
dc.relation.ispartofScience in China, Series D: Earth Sciencesen_HK
dc.subjectMesozoic denudationen_HK
dc.subjectNeoproterozoic magmatic arcen_HK
dc.subjectPengguan tectonic domeen_HK
dc.titleThe Pengguan tectonic dome of Longmen Mountains, Sichuan Province: Mesozoic denudation of a Neoproterozoic magmatic arc-basin systemen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1006-9313&volume=51&issue=11&spage=1545&epage=1559&date=2008&atitle=The+Pengguan+tectonic+dome+of+Longmen+Mountains,+Sichuan+Province:+Mesozoic+denudation+of+a+Neoproterozoic+magmatic+arc-basin+systemen_HK
dc.identifier.emailZhou, MF:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s11430-008-0126-0en_HK
dc.identifier.scopuseid_2-s2.0-55649111081en_HK
dc.identifier.hkuros167317en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-55649111081&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume51en_HK
dc.identifier.issue11en_HK
dc.identifier.spage1545en_HK
dc.identifier.epage1559en_HK
dc.identifier.isiWOS:000260293900005-
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridYan, DP=36683417500en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridWei, GQ=25025250700en_HK
dc.identifier.scopusauthoridGao, JF=25638167000en_HK
dc.identifier.scopusauthoridLiu, SF=24174685600en_HK
dc.identifier.scopusauthoridXu, P=55187529600en_HK
dc.identifier.scopusauthoridShi, XY=15760575300en_HK

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