File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Recognition of early Carboniferous alkaline granite in the southern Altai orogen: post-orogenic processes constrained by U–Pb zircon ages, Nd isotopes, and geochemical data

TitleRecognition of early Carboniferous alkaline granite in the southern Altai orogen: post-orogenic processes constrained by U–Pb zircon ages, Nd isotopes, and geochemical data
Authors
KeywordsAge determination
Calc alkaline rock
Carboniferous
Emplacement
Extensional tectonics
Issue Date2012
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00531/index.htm
Citation
International Journal of Earth Sciences, 2012, v. 101 n. 4, p. 937-950 How to Cite?
AbstractThe Altai orogen forms the southern part of the Central Asian Orogenic Belt (CAOB), the world's largest accretionary orogen. However, its tectonic evolution, particularly during the late Paleozoic, is still not well understood. U-Pb zircon analyses for the Bulgen alkaline granite yield crystallization ages of 358 ± 4 Ma (SHRIMP) and 354 ± 4 Ma (LA-ICP-MS). These ages are significantly younger than published emplacement ages for subduction/collision-related syn-orogenic granitoids (460-375 Ma) in this region. The Bulgen granite has high SiO 2, total alkalis, rare earth elements, HFSE (Th, Zr, Hf, Nb, and Ce), and low Ba, Sr with pronounced negative anomalies in Eu, Ba, Sr, P, and Ti, showing a clear A-type geochemical signature. The granite records high εNd(t) values of +6.3 to +6.4 and young model ages (T DM) of ca. 600 Ma. The Bulgen alkaline granite is largely undeformed as opposed to the early-middle Paleozoic counterparts, which form elongated deformed bodies parallel to the prevailing tectonic fabric (NW direction). Available data suggest that magmatism in the southern Altai region evolved from early-middle Paleozoic I-type tholeiitic and calc-alkaline granitoids to late Paleozoic A-type alkaline granitoids. The high εNd(t) values of the Bulgen alkaline granite indicate a homogeneous juvenile mantle source, whereas the earlymiddle Paleozoic granitoids are characterized by lower and more variable εNd(t) values (-2.6 to +4.2). These differences provide an important insight into the late Paleozoic orogenic processes of the Chinese Altai and indicate a significant change of the tectonic regime from a syn-orogenic regional compression setting to a post-orogenic extensional one. Major tectonic movements in this region ceased after the early Carboniferous. © 2011 Springer-Verlag.
Persistent Identifierhttp://hdl.handle.net/10722/151378
ISSN
2015 Impact Factor: 2.133
2015 SCImago Journal Rankings: 0.992
ISI Accession Number ID
Funding AgencyGrant Number
National Natural Science Foundation of China (NSFC)40702010
Chinese National 973 Program2007CB411307
Ministry of Science and Technology of the People's Republic of ChinaJ0709
J0906
China Geological Survey1212010611803
1212010611817
Funding Information:

We sincerely thank Tom Andersen, Bor-Ming Jahn, E. Hegner, G.C. Zhao, and H.F. Zhang for their constructive and helpful comments. This research was financially supported by the National Natural Science Foundation of China (NSFC grant 40702010), the Chinese National 973 Program (2007CB411307), the Basic Outlay of Scientific Research Work from the Ministry of Science and Technology of the People's Republic of China (J0709, J0906) and the China Geological Survey Project (1212010611803, 1212010611817). We also thank Z.Q. Yan, H. Zhou, and X.M. Liu for laboratory assistance.

References

 

DC FieldValueLanguage
dc.contributor.authorTong, Yen_US
dc.contributor.authorWang, Ten_US
dc.contributor.authorSiebel, Wen_US
dc.contributor.authorHong, DWen_US
dc.contributor.authorSun, Men_US
dc.date.accessioned2012-06-26T06:21:23Z-
dc.date.available2012-06-26T06:21:23Z-
dc.date.issued2012en_US
dc.identifier.citationInternational Journal of Earth Sciences, 2012, v. 101 n. 4, p. 937-950en_US
dc.identifier.issn1437-3254en_US
dc.identifier.urihttp://hdl.handle.net/10722/151378-
dc.description.abstractThe Altai orogen forms the southern part of the Central Asian Orogenic Belt (CAOB), the world's largest accretionary orogen. However, its tectonic evolution, particularly during the late Paleozoic, is still not well understood. U-Pb zircon analyses for the Bulgen alkaline granite yield crystallization ages of 358 ± 4 Ma (SHRIMP) and 354 ± 4 Ma (LA-ICP-MS). These ages are significantly younger than published emplacement ages for subduction/collision-related syn-orogenic granitoids (460-375 Ma) in this region. The Bulgen granite has high SiO 2, total alkalis, rare earth elements, HFSE (Th, Zr, Hf, Nb, and Ce), and low Ba, Sr with pronounced negative anomalies in Eu, Ba, Sr, P, and Ti, showing a clear A-type geochemical signature. The granite records high εNd(t) values of +6.3 to +6.4 and young model ages (T DM) of ca. 600 Ma. The Bulgen alkaline granite is largely undeformed as opposed to the early-middle Paleozoic counterparts, which form elongated deformed bodies parallel to the prevailing tectonic fabric (NW direction). Available data suggest that magmatism in the southern Altai region evolved from early-middle Paleozoic I-type tholeiitic and calc-alkaline granitoids to late Paleozoic A-type alkaline granitoids. The high εNd(t) values of the Bulgen alkaline granite indicate a homogeneous juvenile mantle source, whereas the earlymiddle Paleozoic granitoids are characterized by lower and more variable εNd(t) values (-2.6 to +4.2). These differences provide an important insight into the late Paleozoic orogenic processes of the Chinese Altai and indicate a significant change of the tectonic regime from a syn-orogenic regional compression setting to a post-orogenic extensional one. Major tectonic movements in this region ceased after the early Carboniferous. © 2011 Springer-Verlag.en_US
dc.languageengen_US
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00531/index.htmen_US
dc.relation.ispartofInternational Journal of Earth Sciencesen_US
dc.rightsThe original publication is available at www.springerlink.com-
dc.subjectAge determinationen_US
dc.subjectCalc alkaline rocken_US
dc.subjectCarboniferousen_US
dc.subjectEmplacementen_US
dc.subjectExtensional tectonicsen_US
dc.titleRecognition of early Carboniferous alkaline granite in the southern Altai orogen: post-orogenic processes constrained by U–Pb zircon ages, Nd isotopes, and geochemical dataen_US
dc.typeArticleen_US
dc.identifier.emailTong, Y: yingtong@cags.ac.cnen_US
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1007/s00531-011-0700-0en_US
dc.identifier.scopuseid_2-s2.0-84861768478en_US
dc.identifier.hkuros205445-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84861768478&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume101en_US
dc.identifier.issue4en_US
dc.identifier.spage937en_US
dc.identifier.epage950en_US
dc.identifier.isiWOS:000304175900003-
dc.publisher.placeGermanyen_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridHong, DW=7201840634en_US
dc.identifier.scopusauthoridSiebel, W=6603855539en_US
dc.identifier.scopusauthoridWang, T=36079778200en_US
dc.identifier.scopusauthoridTong, Y=35254458800en_US
dc.identifier.citeulike9663007-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats