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Article: Zircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: implications for the reconstruction of the Columbia supercontinent

TitleZircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: implications for the reconstruction of the Columbia supercontinent
Authors
KeywordsA-type granite
Columbia supercontinent
Hf isotope
Tarim craton
Zircon ree patterns
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2012, v. 222-223, p. 474-487 How to Cite?
AbstractBecause Archean basement rocks are sparsely distributed around the Tarim Basin, little is known of the relationship between the Tarim Craton and the Paleo- to Mesoproterozoic Columbia supercontinent. Zircon U-Pb dating of a Paleoproterozoic gneissic granite in the northern Tarim Craton yielded a crystallization age of 1915 ± 13 Ma, consistent with global Paleoproterozoic collisional events (ca. 2.1-1.8 Ga) recorded in most cratons. Despite the fact that some zircons display discordant U-Pb ages with a distinct loss of radiogenetic Pb, all grains have similar 176Lu/ 177Hf and 176Hf/ 177Hf(t) values. Zircons from this granite have high Th/U ratios (0.15-0.95), but contrasting rare earth element (REE) patterns. The REE patterns show that the incorporation of most REE elements correlates with increasing age discordance. The discordant zircons, unlike typical magmatic zircons, were probably formed in an open system with the participation of aqueous fluids or hydrous melts during late- to post-magmatic recrystallization. Rocks of this granite pluton have high contents of SiO 2 (75.45-78.49 wt.%) and total alkali (6.38-9.00 wt.%), and moderate Al 2O 3 (10.31-13.80 wt.%), showing peraluminous characteristics. Their high contents of high field strength elements (HFSE) and significant negative Eu anomalies are consistent with the geochemical characteristics of A-type granites. The low e{open} Hf(t) values of the granite suggest a derivation through anatexis of late Neoarchean tonalite-trondhjemite-granodiorite (TTG) rocks of the basement, indicating that the geochemical characteristics of A-type granites may originate from partial melting of Archean TTGs. In combination with previously published age data, the regional anatexis provides evidence of a late Paleoproterozoic orogenic event on the northern margin of the Tarim Craton. Because the Paleoproterozoic and Mesoproterozoic sedimentary rocks in the northern Tarim Craton show characteristics of sediments deposited on a passive continental margin, the craton is suggested to have occupy an outboard position in the Columbia supercontinent. © 2011 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151334
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLong, Xen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorYuan, Cen_US
dc.contributor.authorKroener, Aen_US
dc.contributor.authorHu, Aen_US
dc.date.accessioned2012-06-26T06:20:47Z-
dc.date.available2012-06-26T06:20:47Z-
dc.date.issued2012en_US
dc.identifier.citationPrecambrian Research, 2012, v. 222-223, p. 474-487en_US
dc.identifier.issn0301-9268en_US
dc.identifier.urihttp://hdl.handle.net/10722/151334-
dc.description.abstractBecause Archean basement rocks are sparsely distributed around the Tarim Basin, little is known of the relationship between the Tarim Craton and the Paleo- to Mesoproterozoic Columbia supercontinent. Zircon U-Pb dating of a Paleoproterozoic gneissic granite in the northern Tarim Craton yielded a crystallization age of 1915 ± 13 Ma, consistent with global Paleoproterozoic collisional events (ca. 2.1-1.8 Ga) recorded in most cratons. Despite the fact that some zircons display discordant U-Pb ages with a distinct loss of radiogenetic Pb, all grains have similar 176Lu/ 177Hf and 176Hf/ 177Hf(t) values. Zircons from this granite have high Th/U ratios (0.15-0.95), but contrasting rare earth element (REE) patterns. The REE patterns show that the incorporation of most REE elements correlates with increasing age discordance. The discordant zircons, unlike typical magmatic zircons, were probably formed in an open system with the participation of aqueous fluids or hydrous melts during late- to post-magmatic recrystallization. Rocks of this granite pluton have high contents of SiO 2 (75.45-78.49 wt.%) and total alkali (6.38-9.00 wt.%), and moderate Al 2O 3 (10.31-13.80 wt.%), showing peraluminous characteristics. Their high contents of high field strength elements (HFSE) and significant negative Eu anomalies are consistent with the geochemical characteristics of A-type granites. The low e{open} Hf(t) values of the granite suggest a derivation through anatexis of late Neoarchean tonalite-trondhjemite-granodiorite (TTG) rocks of the basement, indicating that the geochemical characteristics of A-type granites may originate from partial melting of Archean TTGs. In combination with previously published age data, the regional anatexis provides evidence of a late Paleoproterozoic orogenic event on the northern margin of the Tarim Craton. Because the Paleoproterozoic and Mesoproterozoic sedimentary rocks in the northern Tarim Craton show characteristics of sediments deposited on a passive continental margin, the craton is suggested to have occupy an outboard position in the Columbia supercontinent. © 2011 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_US
dc.relation.ispartofPrecambrian Researchen_US
dc.subjectA-type graniteen_US
dc.subjectColumbia supercontinenten_US
dc.subjectHf isotopeen_US
dc.subjectTarim cratonen_US
dc.subjectZircon ree patternsen_US
dc.titleZircon REE patterns and geochemical characteristics of Paleoproterozoic anatectic granite in the northern Tarim Craton, NW China: implications for the reconstruction of the Columbia supercontinenten_US
dc.typeArticleen_US
dc.identifier.emailLong, X: longxp@hku.hken_US
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.emailYuan, C: yuanchao@gig.ac.cn-
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2011.09.009en_US
dc.identifier.scopuseid_2-s2.0-84871753745en_US
dc.identifier.hkuros205439-
dc.identifier.isiWOS:000313765700024-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridHu, A=7202699686en_US
dc.identifier.scopusauthoridKröner, A=7006453132en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridLong, X=14012199100en_US
dc.identifier.citeulike9834459-

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