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Article: Prolonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoids

TitleProlonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoids
Authors
KeywordsBatholith
Emplacement
Granitoid
Hafnium
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. 949-968 How to Cite?
AbstractPaleozoic granitoid magmatism played an important role in the tectonic evolution of the Chinese Altai, and zircon U-Pb and Hf isotopic compositions have been determined for samples from eleven granitic plutons/batholiths. The Jiadengyu gneissic granitic pluton yielded a zircon U-Pb age of 479Ma, and thus it does not represent Precambrian basement as suggested previously. Our results and published data demonstrate that voluminous granitoids were continuously emplaced over more than 30% area of the Chinese Altai during the period from 447Ma to 368Ma with a climax at ca 400Ma. Ages for zircon overgrowth rims demonstrate additional thermal events at ca 360 and 280Ma, respectively. Positive ε Hf(t) values (0 to +9) of normal magmatic zircons suggest that the granitoid magmas were derived from juvenile sources. Xenocrystic zircon cores are 543-421Ma old and also give positive ε Hf(t) values (+2.5 to +12), suggesting their origin as early crystallized minerals in the magma chambers or as inherited cores from newly-accreted meterials. The strong magmatism at ca 400Ma significantly changed the Hf isotopic composition of the magma source by substantial input of juvenile material in a relatively short period. Geophysical, geological and geochemical data support that ridge subduction was a possible mechanism for the strong magmatism ca 400Ma and the above mentioned change of Hf isotopic composition in the magma source. © 2011 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/151329
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National 973 Program2007CB411308
Hong Kong Research Grants CouncilHKU704307P
NSFC40725009
HKU
Funding Information:

This study was financially supported by the Chinese National 973 Program (2007CB411308), Hong Kong Research Grants Council (HKU704307P), the NSFC Project (40725009) and a HKU CRCG grant. We thank Biao Song, Liewen Xie, Yueheng Yang and Jianfeng Gao for laboratory assistance. We are very grateful to Prof. Alfred Kroner and an anonymous reviewer for their critical reviews and constructive comments that significantly improved this 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.authorZhao, Gen_US
dc.contributor.authorXiao, Wen_US
dc.contributor.authorLong, Xen_US
dc.contributor.authorWu, F.Yen_US
dc.date.accessioned2012-06-26T06:20:41Z-
dc.date.available2012-06-26T06:20:41Z-
dc.date.issued2011en_US
dc.identifier.citationJournal of Asian Earth Sciences, 2011, v. 42 n. 5, p. 949-968en_US
dc.identifier.issn1367-9120en_US
dc.identifier.urihttp://hdl.handle.net/10722/151329-
dc.description.abstractPaleozoic granitoid magmatism played an important role in the tectonic evolution of the Chinese Altai, and zircon U-Pb and Hf isotopic compositions have been determined for samples from eleven granitic plutons/batholiths. The Jiadengyu gneissic granitic pluton yielded a zircon U-Pb age of 479Ma, and thus it does not represent Precambrian basement as suggested previously. Our results and published data demonstrate that voluminous granitoids were continuously emplaced over more than 30% area of the Chinese Altai during the period from 447Ma to 368Ma with a climax at ca 400Ma. Ages for zircon overgrowth rims demonstrate additional thermal events at ca 360 and 280Ma, respectively. Positive ε Hf(t) values (0 to +9) of normal magmatic zircons suggest that the granitoid magmas were derived from juvenile sources. Xenocrystic zircon cores are 543-421Ma old and also give positive ε Hf(t) values (+2.5 to +12), suggesting their origin as early crystallized minerals in the magma chambers or as inherited cores from newly-accreted meterials. The strong magmatism at ca 400Ma significantly changed the Hf isotopic composition of the magma source by substantial input of juvenile material in a relatively short period. Geophysical, geological and geochemical data support that ridge subduction was a possible mechanism for the strong magmatism ca 400Ma and the above mentioned change of Hf isotopic composition in the magma source. © 2011 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.subjectBatholithen_US
dc.subjectEmplacementen_US
dc.subjectGranitoiden_US
dc.subjectHafniumen_US
dc.subjectIsotopic compositionen_US
dc.titleProlonged magmatism, juvenile nature and tectonic evolution of the Chinese Altai, NW China: evidence from zircon U-Pb and Hf isotopic study of Paleozoic granitoidsen_US
dc.typeArticleen_US
dc.identifier.emailCai, K: caikd@hku.hken_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.emailZhao, G: gzhao@hkucc.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.2010.11.020en_US
dc.identifier.scopuseid_2-s2.0-80053247526en_US
dc.identifier.hkuros204304-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-80053247526&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume42en_US
dc.identifier.issue5en_US
dc.identifier.spage949en_US
dc.identifier.epage968en_US
dc.identifier.isiWOS:000296304700013-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridWu, F=40561925600en_US
dc.identifier.scopusauthoridLong, X=14012199100en_US
dc.identifier.scopusauthoridXiao, W=7202456615en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridCai, K=14011943800en_US
dc.identifier.citeulike8754826-

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