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Article: Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: petrogenesis and tectonic implications

TitleGeochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: petrogenesis and tectonic implications
Authors
KeywordsDacite
Devonian
Hafnium
Igneous geochemistry
Isotopic composition
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal of Asian Earth Sciences, 2011, v. 42 n. 5, p. 969-985 How to Cite?
AbstractPaleozoic intermediate-acidic volcanic rocks exposed in the northwestern Chinese Altai mainly consist of two different lithologic suites: rhyolite suite (RS) and dacite-rhyolite suite (DRS), which were both assigned to the late Ordovician Dongxileke Formation. Zircon U-Pb dating results demonstrate that the RS suite was formed in the late Ordovician (443±2 and 445±2Ma), while the DRS suite yielded much younger ages (411±4Ma) that are consistent with the early Devonian Kangbutiebao Formation of the Chinese Altai. Zircons from the two suites all have high ε Hf(t) values (mostly +2 to +9), indicating a source dominated by juvenile crustal materials. Rhyolites from the two suites are strongly peraluminous and have high SiO 2 (70.53-76.94wt.%) and ε Nd(t) values between -1.7 and -0.6, similar to those of the Paleozoic granitoids (>300Ma) but higher than the Early Paleozoic Habahe sediments, suggesting an origin by partial melting of a juvenile crustal source dominated by meta-igneous rocks. Dacite samples from the DRS suite possess high SiO 2 contents (64.71-67.77wt.%) and Mg # values (52). They have ε Nd(t) values similar to those of the Habahe sediments, which, in combination with their relative high Th/Yb (>3.5) and low Ba/La (<40) ratios, suggests the dacite was originated from sediment-derived melts modified by depleted mantle peridotite. The Mg-rich dacite formed in a critical period (around 410Ma), during which voluminous granitic intrusions and rhyolite were produced. Extensive partial melting of subducting sediments in the early Devonian is in agreement with a high geothermal gradient in the Chinese Altai. A hot subduction regime is proposed to interpret the early Devonian tectonic evolution of the Chinese Altai. © 2010 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/151328
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
National Natural Science Foundation of China40721063
40772130
40803009
Hong Kong RGCHKU704307P
CAS/SAFEA
Funding Information:

This study was supported by the National Basic Research Program of China (2007CB411308), the National Natural Science Foundation of China (Grant Nos. 40721063, 40772130 and 40803009), the Hong Kong RGC Grants (HKU704307P) and the CAS/SAFEA International Partnership Program for Creative Research Teams. We thank the two anonymous reviewers for their constructive comments and also express our appreciation to K.J. Hou, Y. Liu and X.L. Tu for their laboratory assistance. This is contribution No. IS-1266 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, Y.Jen_US
dc.contributor.authorYuan, Cen_US
dc.contributor.authorLong, Xen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorXiao, Wen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorCai, Ken_US
dc.contributor.authorJiang, Yen_US
dc.date.accessioned2012-06-26T06:20:39Z-
dc.date.available2012-06-26T06:20:39Z-
dc.date.issued2011en_US
dc.identifier.citationJournal of Asian Earth Sciences, 2011, v. 42 n. 5, p. 969-985en_US
dc.identifier.issn1367-9120en_US
dc.identifier.urihttp://hdl.handle.net/10722/151328-
dc.description.abstractPaleozoic intermediate-acidic volcanic rocks exposed in the northwestern Chinese Altai mainly consist of two different lithologic suites: rhyolite suite (RS) and dacite-rhyolite suite (DRS), which were both assigned to the late Ordovician Dongxileke Formation. Zircon U-Pb dating results demonstrate that the RS suite was formed in the late Ordovician (443±2 and 445±2Ma), while the DRS suite yielded much younger ages (411±4Ma) that are consistent with the early Devonian Kangbutiebao Formation of the Chinese Altai. Zircons from the two suites all have high ε Hf(t) values (mostly +2 to +9), indicating a source dominated by juvenile crustal materials. Rhyolites from the two suites are strongly peraluminous and have high SiO 2 (70.53-76.94wt.%) and ε Nd(t) values between -1.7 and -0.6, similar to those of the Paleozoic granitoids (>300Ma) but higher than the Early Paleozoic Habahe sediments, suggesting an origin by partial melting of a juvenile crustal source dominated by meta-igneous rocks. Dacite samples from the DRS suite possess high SiO 2 contents (64.71-67.77wt.%) and Mg # values (52). They have ε Nd(t) values similar to those of the Habahe sediments, which, in combination with their relative high Th/Yb (>3.5) and low Ba/La (<40) ratios, suggests the dacite was originated from sediment-derived melts modified by depleted mantle peridotite. The Mg-rich dacite formed in a critical period (around 410Ma), during which voluminous granitic intrusions and rhyolite were produced. Extensive partial melting of subducting sediments in the early Devonian is in agreement with a high geothermal gradient in the Chinese Altai. A hot subduction regime is proposed to interpret the early Devonian tectonic evolution of the Chinese Altai. © 2010 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaesen_US
dc.relation.ispartofJournal of Asian Earth Sciencesen_US
dc.subjectDaciteen_US
dc.subjectDevonianen_US
dc.subjectHafniumen_US
dc.subjectIgneous geochemistryen_US
dc.subjectIsotopic compositionen_US
dc.titleGeochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: petrogenesis and tectonic implicationsen_US
dc.typeArticleen_US
dc.identifier.emailYuan, C: yuanchao@gig.ac.cnen_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hk-
dc.identifier.emailCai, K: caikd@hku.hk-
dc.identifier.authoritySun, M=rp00780en_US
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jseaes.2010.11.005en_US
dc.identifier.scopuseid_2-s2.0-80053246334en_US
dc.identifier.hkuros204305-
dc.identifier.hkuros205444en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053246334&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume42en_US
dc.identifier.issue5en_US
dc.identifier.spage969en_US
dc.identifier.epage985en_US
dc.identifier.isiWOS:000296304700014-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridJiang, Y=39861696800en_US
dc.identifier.scopusauthoridCai, K=14011943800en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridXiao, W=7202456615en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridLong, X=14012199100en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridWang, Y=35320615500en_US
dc.identifier.citeulike8370066-

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