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Article: LA-ICP-MS U-Pb zircon geochronology and geochemistry of Paleoproterozoic mafic dykes from western Shandong Province: Implications for back-arc basin magmatism in the Eastern Block, North China Craton

TitleLA-ICP-MS U-Pb zircon geochronology and geochemistry of Paleoproterozoic mafic dykes from western Shandong Province: Implications for back-arc basin magmatism in the Eastern Block, North China Craton
Authors
KeywordsEastern Block
Elemental and isotopic geochemistry
Intra-continental back-arc basin
LA-ICP-MS zircon dating
North China Craton
Paleoproterozoic mafic dykes
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2007, v. 154 n. 1-2, p. 107-124 How to Cite?
AbstractLA-ICP-MS U-Pb zircon geochronological, elemental and Sr-Nd isotopic data are presented for Paleoproterozoic mafic dykes in western Shandong Province to characterize the Paleoproterozoic tectonic process in the Eastern Block, North China Craton. These dykes are predominantly dolerite with a major mineral assemblage plagioclase + clinopyroxene and yield a LA-ICP-MS U-Pb zircon age of 1841 ± 17 Ma. They are geochemically low- to medium-potassium subalkaline basalts and basaltic andesites. ( 87Sr/ 86Sr)(i) ratios range from 0.702859 to 0.703706, and ε Nd(t) values are from +3.82 to +7.42, which are slightly enriched comparable to a MORB source. The arc-like signatures are revealed in these dykes by the enrichment in LILEs and LREEs and depletion in HFSEs and HREEs. Such signatures suggest an origination from a MORB-like source metasomatized by newly subduction-related fluids potentially via source contamination. The geochemical affinity to both MORB- and arc-like sources, together with incompatible elemental ratios (e.g., Zr/Y, Th/Yb, Ta/Yb, Th/Nb and Ba/La), appears to support a development of a Paleoproterozoic intra-continental extension or failed back-arc basin setting within the Eastern Block in response to an upwelling asthenosphere, accompanied by the amalgamation of the Western and Eastern Blocks along the Trans-North China Orogen at ∼1.85 Ga. Such a proposed tectonic setting might be analogue to modern back-arc basins along the western Pacific. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151203
ISSN
2015 Impact Factor: 4.037
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorFan, Wen_HK
dc.contributor.authorPeng, Ten_HK
dc.contributor.authorSun, Len_HK
dc.contributor.authorXia, Xen_HK
dc.date.accessioned2012-06-26T06:18:37Z-
dc.date.available2012-06-26T06:18:37Z-
dc.date.issued2007en_HK
dc.identifier.citationPrecambrian Research, 2007, v. 154 n. 1-2, p. 107-124en_HK
dc.identifier.issn0301-9268en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151203-
dc.description.abstractLA-ICP-MS U-Pb zircon geochronological, elemental and Sr-Nd isotopic data are presented for Paleoproterozoic mafic dykes in western Shandong Province to characterize the Paleoproterozoic tectonic process in the Eastern Block, North China Craton. These dykes are predominantly dolerite with a major mineral assemblage plagioclase + clinopyroxene and yield a LA-ICP-MS U-Pb zircon age of 1841 ± 17 Ma. They are geochemically low- to medium-potassium subalkaline basalts and basaltic andesites. ( 87Sr/ 86Sr)(i) ratios range from 0.702859 to 0.703706, and ε Nd(t) values are from +3.82 to +7.42, which are slightly enriched comparable to a MORB source. The arc-like signatures are revealed in these dykes by the enrichment in LILEs and LREEs and depletion in HFSEs and HREEs. Such signatures suggest an origination from a MORB-like source metasomatized by newly subduction-related fluids potentially via source contamination. The geochemical affinity to both MORB- and arc-like sources, together with incompatible elemental ratios (e.g., Zr/Y, Th/Yb, Ta/Yb, Th/Nb and Ba/La), appears to support a development of a Paleoproterozoic intra-continental extension or failed back-arc basin setting within the Eastern Block in response to an upwelling asthenosphere, accompanied by the amalgamation of the Western and Eastern Blocks along the Trans-North China Orogen at ∼1.85 Ga. Such a proposed tectonic setting might be analogue to modern back-arc basins along the western Pacific. © 2007 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
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.subjectEastern Blocken_HK
dc.subjectElemental and isotopic geochemistryen_HK
dc.subjectIntra-continental back-arc basinen_HK
dc.subjectLA-ICP-MS zircon datingen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPaleoproterozoic mafic dykesen_HK
dc.titleLA-ICP-MS U-Pb zircon geochronology and geochemistry of Paleoproterozoic mafic dykes from western Shandong Province: Implications for back-arc basin magmatism in the Eastern Block, North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hken_HK
dc.identifier.emailPeng, T: tppeng@gig.al.cnen_HK
dc.identifier.emailXia, X: xpxia@hkusua.hku.hk-
dc.identifier.authorityZhao, G=rp00842en_HK
dc.identifier.authorityXia, X=rp00815en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.precamres.2006.12.010en_HK
dc.identifier.scopuseid_2-s2.0-33847345961en_HK
dc.identifier.hkuros127570-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33847345961&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume154en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage107en_HK
dc.identifier.epage124en_HK
dc.identifier.isiWOS:000245487300005-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, Y=36496272800en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridFan, W=7401635313en_HK
dc.identifier.scopusauthoridPeng, T=7201447871en_HK
dc.identifier.scopusauthoridSun, L=37017386300en_HK
dc.identifier.scopusauthoridXia, X=35241486400en_HK

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