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Article: Kinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar, NW China
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TitleKinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar, NW China
 
AuthorsZhang, J3
Xiao, W3
Han, C3
Ao, S1 3
Yuan, C4
Sun, M2
Geng, H2
Zhao, G2
Guo, Q1 3
Ma, C1
 
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
 
CitationGondwana Research, 2011, v. 19 n. 4, p. 958-974 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gr.2010.10.003
 
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.
 
ISSN1342-937X
2012 Impact Factor: 7.396
2012 SCImago Journal Rankings: 3.115
 
DOIhttp://dx.doi.org/10.1016/j.gr.2010.10.003
 
ISI Accession Number IDWOS:000290508400009
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.

 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorZhang, J
 
dc.contributor.authorXiao, W
 
dc.contributor.authorHan, C
 
dc.contributor.authorAo, S
 
dc.contributor.authorYuan, C
 
dc.contributor.authorSun, M
 
dc.contributor.authorGeng, H
 
dc.contributor.authorZhao, G
 
dc.contributor.authorGuo, Q
 
dc.contributor.authorMa, C
 
dc.date.accessioned2011-09-23T05:46:25Z
 
dc.date.available2011-09-23T05:46:25Z
 
dc.date.issued2011
 
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.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationGondwana Research, 2011, v. 19 n. 4, p. 958-974 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.gr.2010.10.003
 
dc.identifier.doihttp://dx.doi.org/10.1016/j.gr.2010.10.003
 
dc.identifier.epage974
 
dc.identifier.hkuros193908
 
dc.identifier.isiWOS:000290508400009
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.

 
dc.identifier.issn1342-937X
2012 Impact Factor: 7.396
2012 SCImago Journal Rankings: 3.115
 
dc.identifier.issue4
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-79954632194
 
dc.identifier.spage958
 
dc.identifier.urihttp://hdl.handle.net/10722/139184
 
dc.identifier.volume19
 
dc.languageeng
 
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr
 
dc.publisher.placeNetherlands
 
dc.relation.ispartofGondwana Research
 
dc.relation.referencesReferences in Scopus
 
dc.subjectAccretionary complex
 
dc.subjectCoheret unit
 
dc.subjectMelange
 
dc.subjectSouthern Altaids
 
dc.subjectWest Junggar
 
dc.titleKinematics and age constraints of deformation in a Late Carboniferous accretionary complex in Western Junggar, NW China
 
dc.typeArticle
 
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<description.abstract>The Karamay area, situated in the eastern part of Western Junggar, Southern Altaids, contains an ophiolitic m&#233;lange 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&#177;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&#177;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. &#169; 2010 International Association for Gondwana Research.</description.abstract>
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Author Affiliations
  1. Graduate University of Chinese Academy of Sciences
  2. The University of Hong Kong
  3. Institute of Geology and Geophysics Chinese Academy of Sciences
  4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences