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Article: Detrital zircon ages and Hf isotopes of the early Paleozoic flysch sequence in the Chinese Altai, NW China: New constrains on depositional age, provenance and tectonic evolution

TitleDetrital zircon ages and Hf isotopes of the early Paleozoic flysch sequence in the Chinese Altai, NW China: New constrains on depositional age, provenance and tectonic evolution
Authors
KeywordsAccretion complex
Altai
Detrital zircon
Hf isotope
Provenance
Tectonics
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tecto
Citation
Tectonophysics, 2010, v. 480 n. 1-4, p. 213-231 How to Cite?
AbstractSubduction-accretion complexes occur widely in the Central Asian Orogenic Belt (CAOB). Due to the scarcity of fossils, the depositional timing of the Habahe flysch sequence of the subduction-accretion complex in the Chinese Altai is poorly constrained, which gave rise to much controversy in understanding the time of the basement and the tectonic evolution of the Chinese Altai. U-Pb dating of detrital zircons from the Habahe sequence in the northwestern Chinese Altai reveals a young zircon population with a mean 206Pb/ 238U age around 438 Ma which, together with a mean 206Pb/ 238U age of 411 ± 5 Ma for the overlying rhyolite of the Dongxileke Formation, brackets the time of deposition of the sequence between early Silurian and early Devonian. The age of the Dongxileke rhyolite also indicates that the overlying Baihaba Formation possibly began to be deposited in the early Devonian, though U-Pb dating of detrital zircons from this formation gave a maximum depositional age of ∼ 438 Ma. The youngest detrital zircons and metamorphic grains of the Habahe sequence reveal different provenance to the sequence in the east. The youngest and metamorphic zircon grains, with early Paleozoic, Neoproterozoic and pre-Neoproterozoic populations, suggest a multi-source for the Habahe sequence. The predominantly early Paleozoic zircons, characterized by concentric zoning, high Th/U ratios and euhedral shapes, imply that the sediments of the sequence were mostly derived from a proximal magmatic source. Based on the age patterns of the Neoproterozoic and pre-Neoproterozoic populations, the Tuva-Mongol Massif, along with adjacent island arcs and metamorphic belts, may be an alternative source region for the Habahe sequence. In view of new geochemical and chronological data for granitoids and advancement in the study of regional metamorphism in the Chinese Altai, we suggest a tectonic model of subduction beneath a huge subduction-accretion complex for the evolution of the Chinese Altai in the early Paleozoic. © 2009 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/123870
ISSN
2015 Impact Factor: 2.65
2015 SCImago Journal Rankings: 1.971
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
National Natural Science Foundation of China40721063
40772130
40803009
Hong Kong RGCHKU704307P
704004P
HKU CRCG200711159058
Chinese Academy of SciencesGIGCX-07-03
CAS/SAFEA
Funding Information:

This study was supported by the National Basic Research Program of China (2007CB411308), the National Natural Science Foundation of China (Grants No. 40721063, 40772130 and 40803009), the Hong Kong RGC Grants (HKU704307P and 704004P), the HKU CRCG Research Grant (200711159058), the Chinese Academy of Sciences Innovation Project (GIGCX-07-03) and the CAS/SAFEA International Partnership Program for Creative Research Teams. We are grateful to A. Kroner for his constructive comments on the manuscript. We thank Drs. Y.H. Yang, Y.D. Jiang, H.Y. Geng, J. Wong, L.M. Li, C.Q. Yin and K. Wong for their laboratory assistance. This is contribution No. IS-1115 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorLong, Xen_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorWang, Yen_HK
dc.contributor.authorCai, Ken_HK
dc.contributor.authorXia, Xen_HK
dc.contributor.authorXie, Len_HK
dc.date.accessioned2010-10-06T08:53:39Z-
dc.date.available2010-10-06T08:53:39Z-
dc.date.issued2010en_HK
dc.identifier.citationTectonophysics, 2010, v. 480 n. 1-4, p. 213-231en_HK
dc.identifier.issn0040-1951en_HK
dc.identifier.urihttp://hdl.handle.net/10722/123870-
dc.description.abstractSubduction-accretion complexes occur widely in the Central Asian Orogenic Belt (CAOB). Due to the scarcity of fossils, the depositional timing of the Habahe flysch sequence of the subduction-accretion complex in the Chinese Altai is poorly constrained, which gave rise to much controversy in understanding the time of the basement and the tectonic evolution of the Chinese Altai. U-Pb dating of detrital zircons from the Habahe sequence in the northwestern Chinese Altai reveals a young zircon population with a mean 206Pb/ 238U age around 438 Ma which, together with a mean 206Pb/ 238U age of 411 ± 5 Ma for the overlying rhyolite of the Dongxileke Formation, brackets the time of deposition of the sequence between early Silurian and early Devonian. The age of the Dongxileke rhyolite also indicates that the overlying Baihaba Formation possibly began to be deposited in the early Devonian, though U-Pb dating of detrital zircons from this formation gave a maximum depositional age of ∼ 438 Ma. The youngest detrital zircons and metamorphic grains of the Habahe sequence reveal different provenance to the sequence in the east. The youngest and metamorphic zircon grains, with early Paleozoic, Neoproterozoic and pre-Neoproterozoic populations, suggest a multi-source for the Habahe sequence. The predominantly early Paleozoic zircons, characterized by concentric zoning, high Th/U ratios and euhedral shapes, imply that the sediments of the sequence were mostly derived from a proximal magmatic source. Based on the age patterns of the Neoproterozoic and pre-Neoproterozoic populations, the Tuva-Mongol Massif, along with adjacent island arcs and metamorphic belts, may be an alternative source region for the Habahe sequence. In view of new geochemical and chronological data for granitoids and advancement in the study of regional metamorphism in the Chinese Altai, we suggest a tectonic model of subduction beneath a huge subduction-accretion complex for the evolution of the Chinese Altai in the early Paleozoic. © 2009 Elsevier B.V. All rights reserved.en_HK
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tectoen_HK
dc.relation.ispartofTectonophysicsen_HK
dc.rightsTectonophysics. Copyright © Elsevier BV.-
dc.subjectAccretion complexen_HK
dc.subjectAltaien_HK
dc.subjectDetrital zirconen_HK
dc.subjectHf isotopeen_HK
dc.subjectProvenanceen_HK
dc.subjectTectonicsen_HK
dc.titleDetrital zircon ages and Hf isotopes of the early Paleozoic flysch sequence in the Chinese Altai, NW China: New constrains on depositional age, provenance and tectonic evolutionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0040-1951&volume=480&issue=1-4&spage=213&epage=231&date=2010&atitle=Detrital+zircon+ages+and+Hf+isotopes+of+the+early+Paleozoic+flysch+sequence+in+the+Chinese+Altai,+NW+China:+new+constrains+on+depositional+age,+provenance+and+tectonic+evolution-
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailXia, X: xpxia@hotmail.comen_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authorityXia, X=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.tecto.2009.10.013en_HK
dc.identifier.scopuseid_2-s2.0-72749106532en_HK
dc.identifier.hkuros175412-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72749106532&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume480en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage213en_HK
dc.identifier.epage231en_HK
dc.identifier.isiWOS:000274054700016-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLong, X=14012199100en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridWang, Y=35320615500en_HK
dc.identifier.scopusauthoridCai, K=14011943800en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK
dc.identifier.scopusauthoridXie, L=8523115400en_HK
dc.identifier.citeulike6048316-

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