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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
Title | Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: petrogenesis and tectonic implications | ||||||||||
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Authors | |||||||||||
Keywords | Dacite Devonian Hafnium Igneous geochemistry Isotopic composition | ||||||||||
Issue Date | 2011 | ||||||||||
Publisher | Pergamon. 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? | ||||||||||
Abstract | Paleozoic 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 Identifier | http://hdl.handle.net/10722/151328 | ||||||||||
ISSN | 2023 Impact Factor: 2.7 2023 SCImago Journal Rankings: 0.964 | ||||||||||
ISI Accession Number ID |
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 Field | Value | Language |
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dc.contributor.author | Wang, Y.J | en_US |
dc.contributor.author | Yuan, C | en_US |
dc.contributor.author | Long, X | en_US |
dc.contributor.author | Sun, M | en_US |
dc.contributor.author | Xiao, W | en_US |
dc.contributor.author | Zhao, G | en_US |
dc.contributor.author | Cai, K | en_US |
dc.contributor.author | Jiang, Y | en_US |
dc.date.accessioned | 2012-06-26T06:20:39Z | - |
dc.date.available | 2012-06-26T06:20:39Z | - |
dc.date.issued | 2011 | en_US |
dc.identifier.citation | Journal of Asian Earth Sciences, 2011, v. 42 n. 5, p. 969-985 | en_US |
dc.identifier.issn | 1367-9120 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/151328 | - |
dc.description.abstract | Paleozoic 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.language | eng | en_US |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes | en_US |
dc.relation.ispartof | Journal of Asian Earth Sciences | en_US |
dc.subject | Dacite | en_US |
dc.subject | Devonian | en_US |
dc.subject | Hafnium | en_US |
dc.subject | Igneous geochemistry | en_US |
dc.subject | Isotopic composition | en_US |
dc.title | Geochemistry, zircon U-Pb ages and Hf isotopes of the Paleozoic volcanic rocks in the northwestern Chinese Altai: petrogenesis and tectonic implications | en_US |
dc.type | Article | en_US |
dc.identifier.email | Yuan, C: yuanchao@gig.ac.cn | en_US |
dc.identifier.email | Sun, M: minsun@hku.hk | en_US |
dc.identifier.email | Zhao, G: gzhao@hkucc.hku.hk | - |
dc.identifier.email | Cai, K: caikd@hku.hk | - |
dc.identifier.authority | Sun, M=rp00780 | en_US |
dc.identifier.authority | Zhao, G=rp00842 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/j.jseaes.2010.11.005 | en_US |
dc.identifier.scopus | eid_2-s2.0-80053246334 | en_US |
dc.identifier.hkuros | 204305 | - |
dc.identifier.hkuros | 205444 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-80053246334&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 42 | en_US |
dc.identifier.issue | 5 | en_US |
dc.identifier.spage | 969 | en_US |
dc.identifier.epage | 985 | en_US |
dc.identifier.isi | WOS:000296304700014 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Jiang, Y=39861696800 | en_US |
dc.identifier.scopusauthorid | Cai, K=14011943800 | en_US |
dc.identifier.scopusauthorid | Zhao, G=7403296321 | en_US |
dc.identifier.scopusauthorid | Xiao, W=7202456615 | en_US |
dc.identifier.scopusauthorid | Sun, M=25932315800 | en_US |
dc.identifier.scopusauthorid | Long, X=14012199100 | en_US |
dc.identifier.scopusauthorid | Yuan, C=35241599200 | en_US |
dc.identifier.scopusauthorid | Wang, Y=35320615500 | en_US |
dc.identifier.citeulike | 8370066 | - |
dc.identifier.issnl | 1367-9120 | - |