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Article: Geological framework and Paleozoic tectonic history of the Chinese Altai, NW China: A review

TitleGeological framework and Paleozoic tectonic history of the Chinese Altai, NW China: A review
Authors
KeywordsAccretionary Orogensis
CAOB
Chinese Altai
Ridge Subduction
Subduction-Accretion Complex
Tectonic Evolution
Issue Date2011
Citation
Russian Geology And Geophysics, 2011, v. 52 n. 12, p. 1619-1633 How to Cite?
AbstractThe Chinese Altai, as a key portion of the Central Asian Orogenic Belt (CAOB), is dominated by variably deformed and metamorphosed sedimentary rocks, volcanic rocks and granitic intrusions. Its Early Paleozoic tectonic setting has been variously considered as a passive continental margin, a subduction-accretion complex, or a Precambrian microcontinent, and two representative competing tectonic models have been proposed, i.e., open-closure versus subduction-accretion. Recent studies demonstrate that the high-grade metamorphic rocks previously considered as fragments of a Precambrian basement have zircon U-Pb ages (predominantly 528 to 466 Ma) similar to those of the widely distributed low-grade metasedimentary rocks named as Habahe Group in the region, and all these meta-sedimentary rocks were dominantly deposited in the Early Paleozoic. Petrological evidence and geochemical compositions further suggest that these meta-sedimentary rocks were probably deposited in an active margin, not a passive continental margin as previously proposed. The detrital zircons of sediments and igneous zircons from granitoids including the inherited ones (mainly 543-421 Ma) mostly give positive ε Hf(t) values, suggesting significant contributions from mantle-derived juvenile materials to the lower crust. A modeling calculation based on zircon Hf isotopic compositions suggests that as much as 84% of the Chinese Altai is possibly made up of "juvenile" Paleozoic materials. Thus, available data do not support the existence of a Precambrian basement, but rather indicate that the Chinese Altai represented a huge subduction-accretion complex in the Paleozoic. Zircon U-Pb dating results for granitoids indicate that magmatism was active continuously from the Early to Middle Paleozoic, and the strongest magmatic activity took place in the Devonian, coeval with a significant change in zircon Hf isotopic composition. These findings, together with the occurrence of chemically distinctive igneous rocks and the high-T metamorphism, can be collectively accounted for by ridge-trench interaction during the accretionary orogenic process. © 2011.
Persistent Identifierhttp://hdl.handle.net/10722/151349
ISSN
2015 Impact Factor: 1.288
2015 SCImago Journal Rankings: 0.670
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong Research Grants CouncilHKU704307P
National Natural Science Foundation of China40721063
40772130
40803009
HKU CRCG200711159058
HKU
Funding Information:

This study was financially supported by the National Basic Research Program of China (2007CB411308), Hong Kong Research Grants Council (HKU704307P), the National Natural Science Foundation of China (Grants No. 40721063, 40772130, and 40803009), and the HKU CRCG Research Grant (200711159058). We thank Dr. Johan DE GRAVE and M. M Buslov for their carefully reviewing and helpful comments, which substantially improved the manuscript. A HKU postgraduate studentship to Keda CAI is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorCai, Ken_US
dc.contributor.authorSun, Men_US
dc.contributor.authorYuan, Cen_US
dc.contributor.authorLong, Xen_US
dc.contributor.authorXiao, Wen_US
dc.date.accessioned2012-06-26T06:20:55Z-
dc.date.available2012-06-26T06:20:55Z-
dc.date.issued2011en_US
dc.identifier.citationRussian Geology And Geophysics, 2011, v. 52 n. 12, p. 1619-1633en_US
dc.identifier.issn1068-7971en_US
dc.identifier.urihttp://hdl.handle.net/10722/151349-
dc.description.abstractThe Chinese Altai, as a key portion of the Central Asian Orogenic Belt (CAOB), is dominated by variably deformed and metamorphosed sedimentary rocks, volcanic rocks and granitic intrusions. Its Early Paleozoic tectonic setting has been variously considered as a passive continental margin, a subduction-accretion complex, or a Precambrian microcontinent, and two representative competing tectonic models have been proposed, i.e., open-closure versus subduction-accretion. Recent studies demonstrate that the high-grade metamorphic rocks previously considered as fragments of a Precambrian basement have zircon U-Pb ages (predominantly 528 to 466 Ma) similar to those of the widely distributed low-grade metasedimentary rocks named as Habahe Group in the region, and all these meta-sedimentary rocks were dominantly deposited in the Early Paleozoic. Petrological evidence and geochemical compositions further suggest that these meta-sedimentary rocks were probably deposited in an active margin, not a passive continental margin as previously proposed. The detrital zircons of sediments and igneous zircons from granitoids including the inherited ones (mainly 543-421 Ma) mostly give positive ε Hf(t) values, suggesting significant contributions from mantle-derived juvenile materials to the lower crust. A modeling calculation based on zircon Hf isotopic compositions suggests that as much as 84% of the Chinese Altai is possibly made up of "juvenile" Paleozoic materials. Thus, available data do not support the existence of a Precambrian basement, but rather indicate that the Chinese Altai represented a huge subduction-accretion complex in the Paleozoic. Zircon U-Pb dating results for granitoids indicate that magmatism was active continuously from the Early to Middle Paleozoic, and the strongest magmatic activity took place in the Devonian, coeval with a significant change in zircon Hf isotopic composition. These findings, together with the occurrence of chemically distinctive igneous rocks and the high-T metamorphism, can be collectively accounted for by ridge-trench interaction during the accretionary orogenic process. © 2011.en_US
dc.languageengen_US
dc.relation.ispartofRussian Geology and Geophysicsen_US
dc.subjectAccretionary Orogensisen_US
dc.subjectCAOBen_US
dc.subjectChinese Altaien_US
dc.subjectRidge Subductionen_US
dc.subjectSubduction-Accretion Complexen_US
dc.subjectTectonic Evolutionen_US
dc.titleGeological framework and Paleozoic tectonic history of the Chinese Altai, NW China: A reviewen_US
dc.typeArticleen_US
dc.identifier.emailCai, K: caikd@hku.hken_US
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.emailLong, X: longxp@hku.hk-
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.rgg.2011.11.014en_US
dc.identifier.scopuseid_2-s2.0-82955186158en_US
dc.identifier.hkuros205432-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-82955186158&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume52en_US
dc.identifier.issue12en_US
dc.identifier.spage1619en_US
dc.identifier.epage1633en_US
dc.identifier.isiWOS:000298140500010-
dc.publisher.placeRussian Federationen_US
dc.identifier.scopusauthoridCai, K=14011943800en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridLong, X=14012199100en_US
dc.identifier.scopusauthoridXiao, W=7202456615en_US
dc.customcontrol.immutablesml 130311-

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