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Article: LA-ICP-MS U-Pb zircon ages of the Liaohe Group in the Eastern Block of the North China Craton: Constraints on the evolution of the Jiao-Liao-Ji Belt

TitleLA-ICP-MS U-Pb zircon ages of the Liaohe Group in the Eastern Block of the North China Craton: Constraints on the evolution of the Jiao-Liao-Ji Belt
Authors
KeywordsDetrital zircon
Geochronology
LA-ICP-MS
Liaohe Group
North China Craton
Issue Date2004
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2004, v. 134 n. 3-4, p. 349-371 How to Cite?
AbstractAs a major lithostratigraphic unit of the Palaeoproterozoic Jiao-Liao-Ji Belt in the Eastern Block of the North China Craton, the Liaohe Group consists of an assemblage that is transitional from a lower arkose- and volcanic-rich sequence (Langzishan, Li'eryu and Gaojiayu Formations), through a middle carbonate-rich sequence (Dashiqiao Formation) to an upper argillaceous sequence (Gaixian Formation). Tectonically associated with the Liaohe Group are large volumes of granitoid rocks, named the Liaoji Granite, whose emplacement age has been dated at about 2.1-2.2 Ga. Regionally, the Liaohe Group and the associated Liaoji Granite extend along a NEE-trending belt that is flanked by 2.45-2.55 Ga basement gneisses. U-Pb zircon data and cathodoluminescence (CL) imaging are used to constrain the maximum depositional and metamorphic ages of the Liaohe Group, which are critical in understanding the tectonic setting and history of the Jiao-Liao-Ji Belt. Cathodoluminescence images reveal that most detrital zircon grains from the Liaohe Group are characterized by concentric oscillatory zoning, with comparatively low luminescence and high Th/U ratios, suggesting magmatic origin, but minor zircon grains have structureless overgrowth or recrystallization rims that are characterized by low Th/U ratio, indicating metamorphic origin. Results of this study, show that the detrital zircon grains of the Langzishan Formation, the lowest sequence of the Liaohe Group, have concordant U-Pb ages ranging from 2.05 to 2.24 Ga, suggesting that the Liaohe Group was deposited at some time after 2.05 Ga. Although most overgrowth or recrystallization rims are too narrow to be analyzed, some rims yield concordant or upper intercept ages around 1.93 Ga, interpreted as the peak metamorphic age of the Liaohe Group. Detrital zircon grains from the Dashiqiao Formation in the middle sequence of the Liaohe Group have concordant U-Pb ages ranging from 2.25 to 2.53 Ga, some of which are similar to those of the basement gneisses in the area. This study indicates that the Liaohe Group was deposited after the emplacement of the Liaoji Granite, and the latter may be a major component of the provenance for the Langzishan Formation. In contrast, the protoliths of the middle sequence of the Liaohe Group were most probably derived from the basement gneisses. These new zircon ages for the Liaohe Group and recent data for the Liaoji Granite, combined with lithological, structural and metamorphic considerations, support a rifting model for the evolution of the Jiao-Liao-Ji Belt. © 2004 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72637
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLuo, Yen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorLi, Sen_HK
dc.contributor.authorXu, Pen_HK
dc.contributor.authorYe, Ken_HK
dc.contributor.authorXia, Xen_HK
dc.date.accessioned2010-09-06T06:43:42Z-
dc.date.available2010-09-06T06:43:42Z-
dc.date.issued2004en_HK
dc.identifier.citationPrecambrian Research, 2004, v. 134 n. 3-4, p. 349-371en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72637-
dc.description.abstractAs a major lithostratigraphic unit of the Palaeoproterozoic Jiao-Liao-Ji Belt in the Eastern Block of the North China Craton, the Liaohe Group consists of an assemblage that is transitional from a lower arkose- and volcanic-rich sequence (Langzishan, Li'eryu and Gaojiayu Formations), through a middle carbonate-rich sequence (Dashiqiao Formation) to an upper argillaceous sequence (Gaixian Formation). Tectonically associated with the Liaohe Group are large volumes of granitoid rocks, named the Liaoji Granite, whose emplacement age has been dated at about 2.1-2.2 Ga. Regionally, the Liaohe Group and the associated Liaoji Granite extend along a NEE-trending belt that is flanked by 2.45-2.55 Ga basement gneisses. U-Pb zircon data and cathodoluminescence (CL) imaging are used to constrain the maximum depositional and metamorphic ages of the Liaohe Group, which are critical in understanding the tectonic setting and history of the Jiao-Liao-Ji Belt. Cathodoluminescence images reveal that most detrital zircon grains from the Liaohe Group are characterized by concentric oscillatory zoning, with comparatively low luminescence and high Th/U ratios, suggesting magmatic origin, but minor zircon grains have structureless overgrowth or recrystallization rims that are characterized by low Th/U ratio, indicating metamorphic origin. Results of this study, show that the detrital zircon grains of the Langzishan Formation, the lowest sequence of the Liaohe Group, have concordant U-Pb ages ranging from 2.05 to 2.24 Ga, suggesting that the Liaohe Group was deposited at some time after 2.05 Ga. Although most overgrowth or recrystallization rims are too narrow to be analyzed, some rims yield concordant or upper intercept ages around 1.93 Ga, interpreted as the peak metamorphic age of the Liaohe Group. Detrital zircon grains from the Dashiqiao Formation in the middle sequence of the Liaohe Group have concordant U-Pb ages ranging from 2.25 to 2.53 Ga, some of which are similar to those of the basement gneisses in the area. This study indicates that the Liaohe Group was deposited after the emplacement of the Liaoji Granite, and the latter may be a major component of the provenance for the Langzishan Formation. In contrast, the protoliths of the middle sequence of the Liaohe Group were most probably derived from the basement gneisses. These new zircon ages for the Liaohe Group and recent data for the Liaoji Granite, combined with lithological, structural and metamorphic considerations, support a rifting model for the evolution of the Jiao-Liao-Ji Belt. © 2004 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
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.en_HK
dc.subjectDetrital zirconen_HK
dc.subjectGeochronologyen_HK
dc.subjectLA-ICP-MSen_HK
dc.subjectLiaohe Groupen_HK
dc.subjectNorth China Cratonen_HK
dc.titleLA-ICP-MS U-Pb zircon ages of the Liaohe Group in the Eastern Block of the North China Craton: Constraints on the evolution of the Jiao-Liao-Ji Belten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0301-9268&volume=134&issue= 3-4&spage=349&epage=371&date=2004&atitle=LA-ICP-MS+U-Pb+zircon+ages+of+the+Liaohe+Group+in+the+Eastern+Block+of+the+North+China+Craton:+constraints+on+the+evolution+of+the+Jiao-Liao-Ji+Belten_HK
dc.identifier.emailSun, M: minsun@hku.hken_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailXia, X: xpxia@hotmail.comen_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authorityXia, X=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.precamres.2004.07.002en_HK
dc.identifier.scopuseid_2-s2.0-5444262625en_HK
dc.identifier.hkuros108615en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-5444262625&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume134en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage349en_HK
dc.identifier.epage371en_HK
dc.identifier.isiWOS:000224478000007-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLuo, Y=49161174100en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridLi, S=8784176300en_HK
dc.identifier.scopusauthoridXu, P=49161291100en_HK
dc.identifier.scopusauthoridYe, K=7102173832en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK

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