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Article: Geochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?

TitleGeochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?
Authors
KeywordsCentral Asian Orogenic Belt
Geochemistry
Granite
Junggar
Sr-Nd-Hf isotopes
U-Pb zircon
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2009, v. 266 n. 3-4, p. 373-398 How to Cite?
AbstractVoluminous granitic intrusions are distributed in the West Junggar, NW China, and they can be classified as the dioritic rocks, charnockite and alkali-feldspar granite groups. The dioritic rocks (SiO 2 = 50.4-63.8 wt.%) are calc-alkaline and Mg enriched (average MgO = 4.54 wt.%, Mg # = 0.39-0.64), with high Sr/Y ratios (average = 21.2), weak negative Eu (average Eu*/Eu = 0.80) and pronounced negative Nb-Ta anomalies. Their Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7035-0.7042, ε Nd(t) = 4.5-7.9, ε Hf(t) = 14.1-14.5) show a depleted mantle-like signature. These features are compatible with adakites derived from partial melting of subducted oceanic crust that interacted with mantle materials. The charnockites (SiO 2 = 60.0-65.3 wt.%) show transitional geochemical characteristics from calc-alkaline to alkaline, with weak negative Eu (average Eu*/Eu = 0.75) but pronounced negative Nb-Ta anomalies. Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7037-0.7039, ε Nd(t) = 5.2-8.0, ε Hf(t) = 13.9-14.7) also indicate a depleted source, suggesting melts from a hot, juvenile lower crust. Alkali-feldspar granites (SiO 2 = 70.0-78.4 wt.%) are alkali and Fe-enriched, and have distinct negative Eu and Nb-Ta anomalies (average Eu*/Eu = 0.26), low Sr/Y ratios (average = 2.11), and depleted Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7024-0.7045, ε Nd(t) = 5.1-8.9, ε Hf(t) = 13.7-14.2). These characteristics are also comparable with those of rocks derived from juvenile lower crust. Despite of the differences in petrology, geochemistry and possibly different origins, zircon ages indicate that these three groups of rocks were coevally emplaced at ~ 305 Ma. A ridge subduction model can account for the geochemical characteristics of these granitoids and coeval mafic rocks. As the "slab window" opened, upwelling asthenosphere provided enhanced heat flux and triggered voluminous magmatisms: partial melting of the subducting slab formed the dioritic rocks; partial melting of the hot juvenile lower crust produced charnockite and alkali-feldspar granite, and partial melting in the mantle wedge generated mafic rocks in the region. These results suggest that subduction was ongoing in the Late Carboniferous and, thus support that the accretion and collision in the Central Asian Orogenic Belt took place in North Xinjiang after 305 Ma, and possibly in the Permian. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58704
ISSN
2014 Impact Factor: 3.524
2014 SCImago Journal Rankings: 1.667
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU7043/07P
CAS/SAFEA International Partnership Program form Creative Research Teams
National Natural Science Foundation of China40725009
Funding Information:

This study was supported by research grants from the National Basic Research Program of China (2007CB411308), the Hong Kong Research Grants Council (HKU7043/07P), the CAS/SAFEA International Partnership Program form Creative Research Teams, and National Natural Science Foundation of China (40725009). This work is a contribution to ILP (ERAS, Topo-Central Asia) and IGCP 480. We are indebted to Dr. Mehmet Keskin and an anonymous reviewer for the constructive reviews and comments. We acknowledge Dr. Roberta Rudnick for her valuable comments and editorial work. Insightful comments from Professor Alfred Kroner and Professor Jianping Zheng improved an earlier version of the manuscript. Professor Alfred Kroner is thanked for the English polishing. Xiao Fu, Xiaoping Xia, Liewen Xie and Yueheng Yang are thanked for laboratory assistance. A HKU postgraduate studentship to Hongyan Geng is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorGeng, Hen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorXian, Wen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorZhang, Len_HK
dc.contributor.authorWong, Ken_HK
dc.contributor.authorWu, Fen_HK
dc.date.accessioned2010-05-31T03:35:20Z-
dc.date.available2010-05-31T03:35:20Z-
dc.date.issued2009en_HK
dc.identifier.citationChemical Geology, 2009, v. 266 n. 3-4, p. 373-398en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58704-
dc.description.abstractVoluminous granitic intrusions are distributed in the West Junggar, NW China, and they can be classified as the dioritic rocks, charnockite and alkali-feldspar granite groups. The dioritic rocks (SiO 2 = 50.4-63.8 wt.%) are calc-alkaline and Mg enriched (average MgO = 4.54 wt.%, Mg # = 0.39-0.64), with high Sr/Y ratios (average = 21.2), weak negative Eu (average Eu*/Eu = 0.80) and pronounced negative Nb-Ta anomalies. Their Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7035-0.7042, ε Nd(t) = 4.5-7.9, ε Hf(t) = 14.1-14.5) show a depleted mantle-like signature. These features are compatible with adakites derived from partial melting of subducted oceanic crust that interacted with mantle materials. The charnockites (SiO 2 = 60.0-65.3 wt.%) show transitional geochemical characteristics from calc-alkaline to alkaline, with weak negative Eu (average Eu*/Eu = 0.75) but pronounced negative Nb-Ta anomalies. Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7037-0.7039, ε Nd(t) = 5.2-8.0, ε Hf(t) = 13.9-14.7) also indicate a depleted source, suggesting melts from a hot, juvenile lower crust. Alkali-feldspar granites (SiO 2 = 70.0-78.4 wt.%) are alkali and Fe-enriched, and have distinct negative Eu and Nb-Ta anomalies (average Eu*/Eu = 0.26), low Sr/Y ratios (average = 2.11), and depleted Sr-Nd and zircon Hf isotopic compositions (( 87Sr/ 86Sr) i = 0.7024-0.7045, ε Nd(t) = 5.1-8.9, ε Hf(t) = 13.7-14.2). These characteristics are also comparable with those of rocks derived from juvenile lower crust. Despite of the differences in petrology, geochemistry and possibly different origins, zircon ages indicate that these three groups of rocks were coevally emplaced at ~ 305 Ma. A ridge subduction model can account for the geochemical characteristics of these granitoids and coeval mafic rocks. As the "slab window" opened, upwelling asthenosphere provided enhanced heat flux and triggered voluminous magmatisms: partial melting of the subducting slab formed the dioritic rocks; partial melting of the hot juvenile lower crust produced charnockite and alkali-feldspar granite, and partial melting in the mantle wedge generated mafic rocks in the region. These results suggest that subduction was ongoing in the Late Carboniferous and, thus support that the accretion and collision in the Central Asian Orogenic Belt took place in North Xinjiang after 305 Ma, and possibly in the Permian. © 2009 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/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.subjectCentral Asian Orogenic Belten_HK
dc.subjectGeochemistryen_HK
dc.subjectGraniteen_HK
dc.subjectJunggaren_HK
dc.subjectSr-Nd-Hf isotopesen_HK
dc.subjectU-Pb zirconen_HK
dc.titleGeochemical, Sr-Nd and zircon U-Pb-Hf isotopic studies of Late Carboniferous magmatism in the West Junggar, Xinjiang: Implications for ridge subduction?en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=266&issue=3-4&spage=364&epage=389&date=2009&atitle=Geochemical,+Sr–Nd+and+zircon+U–Pb–Hf+isotopic+studies+of+Late+Carboniferous+magmatism+in+the+West+Junggar,+Xinjiang:+implications+for+ridge+subduction?en_HK
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.chemgeo.2009.07.001en_HK
dc.identifier.scopuseid_2-s2.0-68749092890en_HK
dc.identifier.hkuros161213en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-68749092890&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume266en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage373en_HK
dc.identifier.epage398en_HK
dc.identifier.isiWOS:000270346400023-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridGeng, H=26644953700en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridXian, W=49261296500en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridZhang, L=34769304700en_HK
dc.identifier.scopusauthoridWong, K=34769228100en_HK
dc.identifier.scopusauthoridWu, F=40561925600en_HK
dc.identifier.citeulike5294292-

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