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Article: Granites in the Sawuer region of the west Junggar, Xinjiang Province, China: Geochronological and geochemical characteristics and their geodynamic significance

TitleGranites in the Sawuer region of the west Junggar, Xinjiang Province, China: Geochronological and geochemical characteristics and their geodynamic significance
Authors
KeywordsI-type and A-type granite
Junggar
Post-collision
Xinjiang
Zircon SHRIMP U-Pb dating
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2008, v. 106 n. 3-4, p. 191-206 How to Cite?
AbstractThe Sawuer region is located in the west Junggar, Jimunai County of Altay district and Hefeng County of Tacheng district, Xinjiang Autonomous Region, in northwest China. In the study area granitic intrusions are widespread and can be subdivided into I-type granites (Tasite pluton, Sentasi pluton, Wokensala pluton and Kaerjia pluton) and A-type (A 2) granites (Kuoyitasi pluton and Qiaqihai pluton). The I-type granites consist of granite, adamelite, granodiorite, and the A-type granites are mainly represented by alkali granite. SHRIMP U-Pb dating results indicate that the granites in Sawuer region were formed between 337 Ma and 290.7 Ma (late Carboniferous and early Permian), with the I-type granites being formed between 337 Ma and 302.6 Ma, and the A-type between 297.9 and 290.7 Ma. From the older to the youngest granites, their composition changes from calc-alkalic to high-K calc-alkalic, to alkali series, and from I-type to A-type, based on the characteristics of whole rock trace element and rare earth elements geochemistry. This compositional range is the result of a change in the geodynamic regime from compressional to tensional during the late Paleozoic. Strontium, Nd, Pb, O isotope systematics suggest that both the I-type and A-type granites in Sawuer were sourced from the mantle (DM), but with some crustal contamination for the Kuoyitasi pluton. The I-type granites were formed by equilibrium partial melting, while the A-type granites were formed mainly by fractional crystallization. Based on the Rb-Y + Nb and Nb-Y-Ce discrimination criteria by Eby [Eby G.N., 1992. Chemical subdivision of the A-type granitoids: Petrogenetic and tectonic implications. Geology 20, 641-644] and Pearce [Pearce J.A., 1996. Sources and settings of granitic rocks. Episodes 19, 120-125] and comparisons with granites in other regions of northern Xinjiang, the I-type granites were emplaced during a transition from compressional to extensional settings in a post-collision regime, whereas the A-type granites were emplaced in an extensional setting. We concluded that the Sawuer as well as the whole Junggar region in northern Xinjiang were involved in tectonism that gradually changed from compressional to extensional between the late Carboniferous and early Permian. This late Paleozoic granitic magmatism contributed to vertical crustal growth in the region. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58708
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National 973 Program2007CB411304
200ICB409800
China NSFC project40772057
CODES scientific research project, University of Tasmania Australia
Anhui Provincial Natural Science Foundation for Distinguished Young Scholars08040106907
04045063
Funding Information:

The authors would like to thank Profs Wang Jingbin, Gao Jim, Ma Yingjun, Wang Baolin, Xiao Wenjiao, Wang YLIWang and experts from Xinjiang "305" Project Office and Xinjiang No.4 geological team for their help and constructive discussions. We also thank Prof. Liu Dunyi and laboratory assistants Shi YLIWO, Song Biao, Wang Yanbill and Tao Hua for their enthusiastic help in SHRIMP-zircons U-Pbanalyzing and dating. Yang Wenping and He Lixin are thanked for their help during the field investigation. Special thanks are due to Dr. Franco Pirajno for his constructive advice and helpful comments. The two anonymous reviewers and the editor are greatly thanked for their good cornments and suggestions. This research was financially supported by funds from the Chinese National 973 Program (2007CB411304, 200ICB409800), China NSFC project (Grant No.40772057), the CODES scientific research project, University of Tasmania Australia, and the Anhui Provincial Natural Science Foundation for Distinguished Young Scholars (Grant No. 08040106907, 04045063).

References

 

DC FieldValueLanguage
dc.contributor.authorZhou, Ten_HK
dc.contributor.authorYuan, Fen_HK
dc.contributor.authorFan, Yen_HK
dc.contributor.authorZhang, Den_HK
dc.contributor.authorCooke, Den_HK
dc.contributor.authorZhao, Gen_HK
dc.date.accessioned2010-05-31T03:35:24Z-
dc.date.available2010-05-31T03:35:24Z-
dc.date.issued2008en_HK
dc.identifier.citationLithos, 2008, v. 106 n. 3-4, p. 191-206en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58708-
dc.description.abstractThe Sawuer region is located in the west Junggar, Jimunai County of Altay district and Hefeng County of Tacheng district, Xinjiang Autonomous Region, in northwest China. In the study area granitic intrusions are widespread and can be subdivided into I-type granites (Tasite pluton, Sentasi pluton, Wokensala pluton and Kaerjia pluton) and A-type (A 2) granites (Kuoyitasi pluton and Qiaqihai pluton). The I-type granites consist of granite, adamelite, granodiorite, and the A-type granites are mainly represented by alkali granite. SHRIMP U-Pb dating results indicate that the granites in Sawuer region were formed between 337 Ma and 290.7 Ma (late Carboniferous and early Permian), with the I-type granites being formed between 337 Ma and 302.6 Ma, and the A-type between 297.9 and 290.7 Ma. From the older to the youngest granites, their composition changes from calc-alkalic to high-K calc-alkalic, to alkali series, and from I-type to A-type, based on the characteristics of whole rock trace element and rare earth elements geochemistry. This compositional range is the result of a change in the geodynamic regime from compressional to tensional during the late Paleozoic. Strontium, Nd, Pb, O isotope systematics suggest that both the I-type and A-type granites in Sawuer were sourced from the mantle (DM), but with some crustal contamination for the Kuoyitasi pluton. The I-type granites were formed by equilibrium partial melting, while the A-type granites were formed mainly by fractional crystallization. Based on the Rb-Y + Nb and Nb-Y-Ce discrimination criteria by Eby [Eby G.N., 1992. Chemical subdivision of the A-type granitoids: Petrogenetic and tectonic implications. Geology 20, 641-644] and Pearce [Pearce J.A., 1996. Sources and settings of granitic rocks. Episodes 19, 120-125] and comparisons with granites in other regions of northern Xinjiang, the I-type granites were emplaced during a transition from compressional to extensional settings in a post-collision regime, whereas the A-type granites were emplaced in an extensional setting. We concluded that the Sawuer as well as the whole Junggar region in northern Xinjiang were involved in tectonism that gradually changed from compressional to extensional between the late Carboniferous and early Permian. This late Paleozoic granitic magmatism contributed to vertical crustal growth in the region. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectI-type and A-type graniteen_HK
dc.subjectJunggaren_HK
dc.subjectPost-collisionen_HK
dc.subjectXinjiangen_HK
dc.subjectZircon SHRIMP U-Pb datingen_HK
dc.titleGranites in the Sawuer region of the west Junggar, Xinjiang Province, China: Geochronological and geochemical characteristics and their geodynamic significanceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=106&spage=191&epage=206&date=2008&atitle=Granites+in+the+Sawuer+region+of+the+west+Junggar,+Xinjiang+Province,+China:+geochronological+and+geochemical+characteristics+and+their+geodynamic+significanceen_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.lithos.2008.06.014en_HK
dc.identifier.scopuseid_2-s2.0-55749103532en_HK
dc.identifier.hkuros154946en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-55749103532&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume106en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage191en_HK
dc.identifier.epage206en_HK
dc.identifier.isiWOS:000261680100001-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhou, T=7402989472en_HK
dc.identifier.scopusauthoridYuan, F=35333422400en_HK
dc.identifier.scopusauthoridFan, Y=35794447800en_HK
dc.identifier.scopusauthoridZhang, D=8618082600en_HK
dc.identifier.scopusauthoridCooke, D=7202107225en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK

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