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Article: Archean crustal evolution of the northern Tarim craton, NW China: Zircon U-Pb and Hf isotopic constraints

TitleArchean crustal evolution of the northern Tarim craton, NW China: Zircon U-Pb and Hf isotopic constraints
Authors
KeywordsArchean
Crustal evolution
Hf isotope
Tarim craton
Zircon dating
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2010, v. 180 n. 3-4, p. 272-284 How to Cite?
AbstractTarim craton is one of the major cratons in Central Asia. Basement rocks of the craton, such as TTG gneisses, are dominantly exposed in the northern (Kuluketage area) and the Eastern (Altyn Tagh Mountain). Recent years, only a few reliable Archean ages have been obtained for the basement rocks in the Altyn Tagh Mountain. Geochronological and geochemical studies have been conducted on the orthogneisses exposed in the Kuluketage area in order to unravel complex history of the Tarim craton. Zircon U-Pb dating of the rocks yielded three weighted mean 207Pb/ 206Pb ages of 2516 ± 6, 2575 ± 13 and 2460 ± 3 Ma, indicating that their protoliths were formed in the late Neoarchean to early Paleoproterozoic. The late Neoarchean orthogneisses exhibit low Sr/Y ratios (4-19) and Mg # values (35-44), with depleted Sr contents, negative Nb, Ta and Ti anomalies and strongly fractionated REE patterns ((La/Yb) N = 13-62), displaying typical geochemical features of arc igneous rocks. In contrast, the early Paleoproterozoic orthogneisses are characterized by high-SiO 2 contents, Sr/Y ratios (37-67) and Mg # values (46-67), with variably fractionated REE patterns ((La/Yb) N = 9-89), slight Sr enrichment and positive Eu anomalies, resembling high-SiO 2 adakites derived from subducted basaltic slab-melts. The late Neoarchean TTGs have low ε Hf(t) values (-5 to +1) and initial Hf compositions (0.280987-0.281160) with Mesoarchean two-stage model ages (T DM2 = 2.9-3.3 Ga), suggesting that the crustal materials of the basement rocks in this area were initially extracted from a depleted mantle in the late Paleo- to Mesoarchean and were reworked in the late Neoarchean. The history of crustal growth is different from that of the North China and Yangtze cratons and thus implies relatively younger cratonization than the North China and Yangtze cratons. Zircons in the early Paleoproterozoic orthogneisses have high ε Hf(t) values (+4 to +10) and young Neoarchean two-stage model ages (2.5-2.7 Ga), revealing a juvenile crustal growth event in the late Neoarchean. Because there is no record of coeval juvenile crustal growth in the other two cratons, we suggest a separate crustal evolution for the northern Tarim craton which was stayed far from the other two cratons before the early Paleoproterozoic. © 2010 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/123869
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
National Natural Science Foundation of China40803009
40721063
40772130
Hong Kong RGC7043/07P
7066/07P
7053/08P
CAS/SAFEA International Partnership Program for Creative Research Teams
Funding Information:

We appreciated A. Kroner for his carefully polishing work and valuable comments to the revised manuscript. Critical and constructive comments offered by Armin Zeh, an anonymous reviewer, and editor Randall Parrish were of great help in improving the manuscript. This study was supported by the National Basic Research Program of China (2007CB411308), National Natural Science Foundation of China (40803009, 40721063, 40772130), Hong Kong RGC Grants (7043/07P, 7066/07P and 7053/08P) and CAS/SAFEA International Partnership Program for Creative Research Teams. This is contribution no. IS-1197 from GIGCAS.

References

 

DC FieldValueLanguage
dc.contributor.authorLong, Xen_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorWang, Yen_HK
dc.contributor.authorYang, Yen_HK
dc.contributor.authorHu, Aen_HK
dc.date.accessioned2010-10-06T08:52:56Z-
dc.date.available2010-10-06T08:52:56Z-
dc.date.issued2010en_HK
dc.identifier.citationPrecambrian Research, 2010, v. 180 n. 3-4, p. 272-284en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/123869-
dc.description.abstractTarim craton is one of the major cratons in Central Asia. Basement rocks of the craton, such as TTG gneisses, are dominantly exposed in the northern (Kuluketage area) and the Eastern (Altyn Tagh Mountain). Recent years, only a few reliable Archean ages have been obtained for the basement rocks in the Altyn Tagh Mountain. Geochronological and geochemical studies have been conducted on the orthogneisses exposed in the Kuluketage area in order to unravel complex history of the Tarim craton. Zircon U-Pb dating of the rocks yielded three weighted mean 207Pb/ 206Pb ages of 2516 ± 6, 2575 ± 13 and 2460 ± 3 Ma, indicating that their protoliths were formed in the late Neoarchean to early Paleoproterozoic. The late Neoarchean orthogneisses exhibit low Sr/Y ratios (4-19) and Mg # values (35-44), with depleted Sr contents, negative Nb, Ta and Ti anomalies and strongly fractionated REE patterns ((La/Yb) N = 13-62), displaying typical geochemical features of arc igneous rocks. In contrast, the early Paleoproterozoic orthogneisses are characterized by high-SiO 2 contents, Sr/Y ratios (37-67) and Mg # values (46-67), with variably fractionated REE patterns ((La/Yb) N = 9-89), slight Sr enrichment and positive Eu anomalies, resembling high-SiO 2 adakites derived from subducted basaltic slab-melts. The late Neoarchean TTGs have low ε Hf(t) values (-5 to +1) and initial Hf compositions (0.280987-0.281160) with Mesoarchean two-stage model ages (T DM2 = 2.9-3.3 Ga), suggesting that the crustal materials of the basement rocks in this area were initially extracted from a depleted mantle in the late Paleo- to Mesoarchean and were reworked in the late Neoarchean. The history of crustal growth is different from that of the North China and Yangtze cratons and thus implies relatively younger cratonization than the North China and Yangtze cratons. Zircons in the early Paleoproterozoic orthogneisses have high ε Hf(t) values (+4 to +10) and young Neoarchean two-stage model ages (2.5-2.7 Ga), revealing a juvenile crustal growth event in the late Neoarchean. Because there is no record of coeval juvenile crustal growth in the other two cratons, we suggest a separate crustal evolution for the northern Tarim craton which was stayed far from the other two cratons before the early Paleoproterozoic. © 2010 Elsevier B.V. All rights reserved.en_HK
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamresen_HK
dc.relation.ispartofPrecambrian Researchen_HK
dc.rightsPrecambrian Research. Copyright © Elsevier BV.-
dc.subjectArcheanen_HK
dc.subjectCrustal evolutionen_HK
dc.subjectHf isotopeen_HK
dc.subjectTarim cratonen_HK
dc.subjectZircon datingen_HK
dc.titleArchean crustal evolution of the northern Tarim craton, NW China: Zircon U-Pb and Hf isotopic constraintsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0301-9268&volume=180&issue=3-4&spage=272&epage=284&date=2010&atitle=Archean+crustal+evolution+of+the+northern+Tarim+craton,+NW+China:+Zircon+U-Pb+and+Hf+isotopic+constraints-
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.precamres.2010.05.001en_HK
dc.identifier.scopuseid_2-s2.0-77953650729en_HK
dc.identifier.hkuros175411-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953650729&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume180en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage272en_HK
dc.identifier.epage284en_HK
dc.identifier.isiWOS:000280032200010-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLong, X=14012199100en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridWang, Y=35320615500en_HK
dc.identifier.scopusauthoridYang, Y=49061684300en_HK
dc.identifier.scopusauthoridHu, A=7202699686en_HK
dc.identifier.citeulike7271084-

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