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Article: Geochemistry of Paleoproterozoic (∼1770 Ma) mafic dikes from the Trans-North China Orogen and tectonic implications

TitleGeochemistry of Paleoproterozoic (∼1770 Ma) mafic dikes from the Trans-North China Orogen and tectonic implications
Authors
KeywordsGeochemistry
Mafic Dikes
Paleoproterozoic
Subduction-Related Lithospheric Mantle
Trans-North China Orogen
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jseaes
Citation
Journal Of Asian Earth Sciences, 2008, v. 33 n. 1-2, p. 61-77 How to Cite?
AbstractPaleoproterozoic (∼1770 Ma) mafic dikes occur throughout the Trans-North China Orogen. These dikes can be divided into three geochemically distinct groups. Group 1 with FeOt of 12.73-18.06%, (Nb/La) N 0.18-0.39, (Th/La) N of, 0.60-1.24, ε Nd(t) of -5.1 to -2.4, and an enrichment in LILE's and a depletion in HFSE's. Group 2 has flat REEs and incompatible elements patterns, and possesses (Nb/La) N = 0.64-0.87, (Th/La) N = 0.61-1.20 and ε Nd(t) = -1.7 to 1.1. Group 3 has low FeOt contents (8.19-11.57%) and (Th/La) N ratios (0.29-0.72), but similar (Nb/La) N ratios and ε Nd(t) values to those of Group 1. Petrological and geochemical data suggest that these dikes may have originated from different sources. Group 1 could be derived from a "re-fertilized" lithospheric source incorporating a continental basaltic component trapped from a earlier phase of subduction. Group 2 was likely a product of a subduction-modified lithospheric mantle hybridized by recycled gabbroic lower crust. By contrast, Group 3 originated from a mixture of subduction-modified lithospheric mantle with a MORB component. In combination with the available data, we propose that the sources of the mafic dikes were initially modified by the ∼1.85 Ga subduction/collision event that assembled the North China Craton, and partially melted under subsequent rifting in response to the upwelling convective mantle. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151243
ISSN
2015 Impact Factor: 2.647
2015 SCImago Journal Rankings: 1.393
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorCawood, PAen_US
dc.contributor.authorFan, Wen_US
dc.contributor.authorPeng, Ten_US
dc.contributor.authorSun, Len_US
dc.date.accessioned2012-06-26T06:19:12Z-
dc.date.available2012-06-26T06:19:12Z-
dc.date.issued2008en_US
dc.identifier.citationJournal Of Asian Earth Sciences, 2008, v. 33 n. 1-2, p. 61-77en_US
dc.identifier.issn1367-9120en_US
dc.identifier.urihttp://hdl.handle.net/10722/151243-
dc.description.abstractPaleoproterozoic (∼1770 Ma) mafic dikes occur throughout the Trans-North China Orogen. These dikes can be divided into three geochemically distinct groups. Group 1 with FeOt of 12.73-18.06%, (Nb/La) N 0.18-0.39, (Th/La) N of, 0.60-1.24, ε Nd(t) of -5.1 to -2.4, and an enrichment in LILE's and a depletion in HFSE's. Group 2 has flat REEs and incompatible elements patterns, and possesses (Nb/La) N = 0.64-0.87, (Th/La) N = 0.61-1.20 and ε Nd(t) = -1.7 to 1.1. Group 3 has low FeOt contents (8.19-11.57%) and (Th/La) N ratios (0.29-0.72), but similar (Nb/La) N ratios and ε Nd(t) values to those of Group 1. Petrological and geochemical data suggest that these dikes may have originated from different sources. Group 1 could be derived from a "re-fertilized" lithospheric source incorporating a continental basaltic component trapped from a earlier phase of subduction. Group 2 was likely a product of a subduction-modified lithospheric mantle hybridized by recycled gabbroic lower crust. By contrast, Group 3 originated from a mixture of subduction-modified lithospheric mantle with a MORB component. In combination with the available data, we propose that the sources of the mafic dikes were initially modified by the ∼1.85 Ga subduction/collision event that assembled the North China Craton, and partially melted under subsequent rifting in response to the upwelling convective mantle. © 2007 Elsevier Ltd. All rights reserved.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.subjectGeochemistryen_US
dc.subjectMafic Dikesen_US
dc.subjectPaleoproterozoicen_US
dc.subjectSubduction-Related Lithospheric Mantleen_US
dc.subjectTrans-North China Orogenen_US
dc.titleGeochemistry of Paleoproterozoic (∼1770 Ma) mafic dikes from the Trans-North China Orogen and tectonic implicationsen_US
dc.typeArticleen_US
dc.identifier.emailWang, Y: yjwang@gig.ac.cnen_US
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hk-
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.authorityZhao, G=rp00842en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jseaes.2007.10.018en_US
dc.identifier.scopuseid_2-s2.0-43249130143en_US
dc.identifier.hkuros144309-
dc.identifier.volume33en_US
dc.identifier.issue1-2en_US
dc.identifier.spage61en_US
dc.identifier.epage77en_US
dc.identifier.isiWOS:000256852500004-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridWang, Y=36496272800en_US
dc.identifier.scopusauthoridZhao, G=7403296321en_US
dc.identifier.scopusauthoridCawood, PA=7004146041en_US
dc.identifier.scopusauthoridFan, W=7401635313en_US
dc.identifier.scopusauthoridPeng, T=7201447871en_US
dc.identifier.scopusauthoridSun, L=37017386300en_US

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