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Article: Precambrian detrital zircons in the Early Paleozoic Chinese Altai: Their provenance and implications for the crustal growth of central Asia

TitlePrecambrian detrital zircons in the Early Paleozoic Chinese Altai: Their provenance and implications for the crustal growth of central Asia
Authors
KeywordsCAOB
Chinese Altai
Detrital age
Metasedimentary rocks
Tuva-Mongolian block
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2011, v. 189 n. 1-2, p. 140-154 How to Cite?
AbstractThe basement characteristic of the Chinese Altai is not firmly constrained, which has strictly hindered our understanding of the early crustal growth in the region. The presence of Precambrian detrital zircons in metasedimentary rocks and xenocrystic zircons in granitoids may be regarded as evidence for the existence of unexposed old basement rocks, but can also be explained as detritus originally derived from a nearby cratonic fragment. This paper reports detrital zircon U-Pb and Hf isotopic data for both low- and high-grade metasedimentary rocks from the Chinese Altai. Zircons from these samples have similar age patterns and Hf isotopic compositions. They are characterized by an overwhelming dominance of Neoproterozoic-Early Paleozoic ages, with prominent peaks around 465-542Ma and e{open} Hf(t) values varying from -25 to +15. Besides, a few zircons cluster at 1.8-2.0Ga and sparse ones yield discordant ages around 2.3-2.6Ga, and both give negative e{open} Hf(t) values between 0 and -28. Combined with previous results in the region, our data suggest that low- and high-grade metasedimentary rocks most likely derived from similar provenances. These data, plus some xenocrystic zircon ages from the granitoid rocks, are quite comparable with the age patterns of the micro-continents and arc terranes in western Mongolia. The zircon population of 440-580Ma is dominant for gneissic granitoids within the Neoproterozoic-Early Paleozoic terranes in western Mongolian and the Chinese Altai. The Precambrian zircons (>540Ma) resemble those from old rocks preserved in the Tuva-Mongolian (TM) block and its adjacent arc terranes. Therefore, we suggest that old zircons in the Chinese Altai more likely represent the detritus recycled from western Mongolia. Moreover, information from the TM-derived Precambrian zircons, combined with previous palaeomagnetic constraints, favors northern India as the potential origin for the TM block, from which a small micro-continent drifted northwards and incorporated into the CAOB in a time interval from the Neoproterozoic to Early Paleozoic. Accordingly, the crustal growth of the CAOB in western Mongolia and the Chinese Altai could be outlined by a single accretionary system, and secular amalgamation of magmatic arcs around a Precambrian micro-continent can account for the accretionary history of the region in the Early Paleozoic time. © 2011 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151316
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National 973 Program2007CB411308
Hong Kong Research Grants CouncilHKU704307P
NSFC40725009
Hong Kong University
Hong Kong-Germany Joint research Scheme
Funding Information:

This study was financially supported by funds from the Chinese National 973 Program (2007CB411308), the Hong Kong Research Grants Council (HKU704307P), the NSFC (40725009), Hong Kong University research grants and Hong Kong-Germany Joint research Scheme. Xie Liewen and Yang Yueheng are appreciated for laboratory assistance. Inna Yu Safonova and an anonymous reviewer are thanked for their comments and suggestions which significantly improved the manuscript. We thank Peter Cawood for his kind and careful editorial help. We wish to thank Kenny Wong, Geng Hongyan and Cai Keda for their great help during our field investigation.

References

 

DC FieldValueLanguage
dc.contributor.authorJiang, Yen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorXia, Xen_HK
dc.contributor.authorLong, Xen_HK
dc.contributor.authorWu, Fen_HK
dc.date.accessioned2012-06-26T06:20:31Z-
dc.date.available2012-06-26T06:20:31Z-
dc.date.issued2011en_HK
dc.identifier.citationPrecambrian Research, 2011, v. 189 n. 1-2, p. 140-154en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151316-
dc.description.abstractThe basement characteristic of the Chinese Altai is not firmly constrained, which has strictly hindered our understanding of the early crustal growth in the region. The presence of Precambrian detrital zircons in metasedimentary rocks and xenocrystic zircons in granitoids may be regarded as evidence for the existence of unexposed old basement rocks, but can also be explained as detritus originally derived from a nearby cratonic fragment. This paper reports detrital zircon U-Pb and Hf isotopic data for both low- and high-grade metasedimentary rocks from the Chinese Altai. Zircons from these samples have similar age patterns and Hf isotopic compositions. They are characterized by an overwhelming dominance of Neoproterozoic-Early Paleozoic ages, with prominent peaks around 465-542Ma and e{open} Hf(t) values varying from -25 to +15. Besides, a few zircons cluster at 1.8-2.0Ga and sparse ones yield discordant ages around 2.3-2.6Ga, and both give negative e{open} Hf(t) values between 0 and -28. Combined with previous results in the region, our data suggest that low- and high-grade metasedimentary rocks most likely derived from similar provenances. These data, plus some xenocrystic zircon ages from the granitoid rocks, are quite comparable with the age patterns of the micro-continents and arc terranes in western Mongolia. The zircon population of 440-580Ma is dominant for gneissic granitoids within the Neoproterozoic-Early Paleozoic terranes in western Mongolian and the Chinese Altai. The Precambrian zircons (>540Ma) resemble those from old rocks preserved in the Tuva-Mongolian (TM) block and its adjacent arc terranes. Therefore, we suggest that old zircons in the Chinese Altai more likely represent the detritus recycled from western Mongolia. Moreover, information from the TM-derived Precambrian zircons, combined with previous palaeomagnetic constraints, favors northern India as the potential origin for the TM block, from which a small micro-continent drifted northwards and incorporated into the CAOB in a time interval from the Neoproterozoic to Early Paleozoic. Accordingly, the crustal growth of the CAOB in western Mongolia and the Chinese Altai could be outlined by a single accretionary system, and secular amalgamation of magmatic arcs around a Precambrian micro-continent can account for the accretionary history of the region in the Early Paleozoic time. © 2011 Elsevier B.V.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_HK
dc.relation.ispartofPrecambrian Researchen_HK
dc.subjectCAOBen_HK
dc.subjectChinese Altaien_HK
dc.subjectDetrital ageen_HK
dc.subjectMetasedimentary rocksen_HK
dc.subjectTuva-Mongolian blocken_HK
dc.titlePrecambrian detrital zircons in the Early Paleozoic Chinese Altai: Their provenance and implications for the crustal growth of central Asiaen_HK
dc.typeArticleen_HK
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_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2011.05.008en_HK
dc.identifier.scopuseid_2-s2.0-79960388538en_HK
dc.identifier.hkuros204307-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79960388538&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume189en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage140en_HK
dc.identifier.epage154en_HK
dc.identifier.isiWOS:000293931400008-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridJiang, Y=39861696800en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK
dc.identifier.scopusauthoridLong, X=14012199100en_HK
dc.identifier.scopusauthoridWu, F=40561925600en_HK
dc.identifier.citeulike9418980-

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