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Article: Kinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar, NW China

TitleKinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar, NW China
Authors
KeywordsAccretionary complex
Coheret unit
Melange
Southern Altaids
West Junggar
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
Citation
Gondwana Research, 2011, v. 19 n. 4, p. 958-974 How to Cite?
Abstract
The Karamay area, situated in the eastern part of Western Junggar, Southern Altaids, contains an ophiolitic mélange with ultramafic rocks, gabbro, basalt, chert and limestone, which show typical block-in-matrix structures, and coherent turbidites and tuffs. These lithological associations are interpreted as incoherent and coherent series formed in an accretionary complex. On the basis of detailed field mapping and analyses of the asymmetry of imbricate thrusts, duplexes, tilted structures, shear band cleavages, and the NW-verging inclined to overturned folds, we conclude that the overall movement in the accretionary complex was top-to-the-NW. The youngest tuff involved in the deformation contains detrital zircons that have a U-Pb age (LA-MC ICP-MS) of 308±7Ma. 39Ar- 40Ar resistance furnace step-heating of amphibole separates from a diorite dike, which cuts the folded and imbricated rocks in the accretionary prism, yielded a plateau age of 307±2Ma. Consequently, the age of the deformation in the prism is tightly constrained at 307-308Ma, implying that the deformation occurred in an extremely short time-span during SE-ward subduction. Combined contemporaneous occurrence of Baogutu adakite, high-Mg, Sr-enriched and Y-poor dioritic dikes, Miaoergou charnockite, and Maliya mafic rocks, we further suggest the accretionary complex was cut by near-trench volcanic rocks and plutons possibly due to interaction with a spreading ridge. © 2010 International Association for Gondwana Research.
Persistent Identifierhttp://hdl.handle.net/10722/139184
ISSN
2013 Impact Factor: 8.122
2013 SCImago Journal Rankings: 3.898
ISI Accession Number ID
Funding AgencyGrant Number
Chinese State 973 Program2007CB411307
Chinese Academy of SciencesKZCX2-YW-Q04-08
Natural Science Foundation of China40725009
40523003
Funding Information:

We thank Jiliang Li, Jinyi Li, Yue Zhao, Lifei Zhang, Jinjiang Zhang, Zhaojie Guo, Baofu Han, Tianfeng Wan, Yadong Zheng and Fei Wang for useful discussions and suggestions on this manuscript. We acknowledge Drs. Liangjun Yu, Qigui Mao, and Peng Xu for field assistance and Liekun Yang for argon-argon analytic procedure. Brian F. Windley, Timothy M. Kusky and Cameron Quinn critically read earlier versions of the manuscript. We sincerely appreciate K. de Jong, an anonymous reviewer, and the editor for their critical and constructive comments. Funds from the Chinese State 973 Program (2007CB411307) the Innovative Program of the Chinese Academy of Sciences (KZCX2-YW-Q04-08), and the Natural Science Foundation of China Projects (40725009 and 40523003) are gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Jen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorHan, Cen_HK
dc.contributor.authorAo, Sen_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorGeng, Hen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorGuo, Qen_HK
dc.contributor.authorMa, Cen_HK
dc.date.accessioned2011-09-23T05:46:25Z-
dc.date.available2011-09-23T05:46:25Z-
dc.date.issued2011en_HK
dc.identifier.citationGondwana Research, 2011, v. 19 n. 4, p. 958-974en_HK
dc.identifier.issn1342-937Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/139184-
dc.description.abstractThe Karamay area, situated in the eastern part of Western Junggar, Southern Altaids, contains an ophiolitic mélange with ultramafic rocks, gabbro, basalt, chert and limestone, which show typical block-in-matrix structures, and coherent turbidites and tuffs. These lithological associations are interpreted as incoherent and coherent series formed in an accretionary complex. On the basis of detailed field mapping and analyses of the asymmetry of imbricate thrusts, duplexes, tilted structures, shear band cleavages, and the NW-verging inclined to overturned folds, we conclude that the overall movement in the accretionary complex was top-to-the-NW. The youngest tuff involved in the deformation contains detrital zircons that have a U-Pb age (LA-MC ICP-MS) of 308±7Ma. 39Ar- 40Ar resistance furnace step-heating of amphibole separates from a diorite dike, which cuts the folded and imbricated rocks in the accretionary prism, yielded a plateau age of 307±2Ma. Consequently, the age of the deformation in the prism is tightly constrained at 307-308Ma, implying that the deformation occurred in an extremely short time-span during SE-ward subduction. Combined contemporaneous occurrence of Baogutu adakite, high-Mg, Sr-enriched and Y-poor dioritic dikes, Miaoergou charnockite, and Maliya mafic rocks, we further suggest the accretionary complex was cut by near-trench volcanic rocks and plutons possibly due to interaction with a spreading ridge. © 2010 International Association for Gondwana Research.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcren_HK
dc.relation.ispartofGondwana Researchen_HK
dc.subjectAccretionary complexen_HK
dc.subjectCoheret uniten_HK
dc.subjectMelangeen_HK
dc.subjectSouthern Altaidsen_HK
dc.subjectWest Junggaren_HK
dc.titleKinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar, NW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1342-937X&volume=19&issue=4&spage=958&epage=974&date=2011&atitle=Kinematics+and+age+constraints+of+deformation+in+a+Late+Carboniferous+accretionary+complex+in+Western+Junggar,+NW+China-
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gr.2010.10.003en_HK
dc.identifier.scopuseid_2-s2.0-79954632194en_HK
dc.identifier.hkuros193908en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79954632194&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume19en_HK
dc.identifier.issue4en_HK
dc.identifier.spage958en_HK
dc.identifier.epage974en_HK
dc.identifier.isiWOS:000290508400009-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhang, J=7601357515en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridHan, C=35794513200en_HK
dc.identifier.scopusauthoridAo, S=14010187500en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridGeng, H=26644953700en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridGuo, Q=35304987200en_HK
dc.identifier.scopusauthoridMa, C=49964226200en_HK

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