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Article: Geochemical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications

TitleGeochemical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implications
Authors
KeywordsAlkaline intrusive complex
Lithospheric mantle
Mesozoic
North China Craton
Issue Date2005
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2005, v. 81 n. 1-4, p. 297-317 How to Cite?
AbstractMesozoic alkaline intrusive complexes are widespread in the southern portion of the North China Craton and can provide some important constraints on the evolution of the Mesozoic lithosphere beneath the region. Three selected intrusive complexes (Tongshi, Hongshan, and Longbaoshan) are generally high in alkalis (K 2O+Na 2 O=9∼13 wt.%) and Al 2O 3 (14∼21.6 wt.%) and low in CaO and TiO 2 (<0.6 wt.%), with high and variable SiO 2 contents. Rocks from these complexes are all enriched in LREE and LILE (Cs, Rb, Ba, U, Th), depleted in Nb and Ti, have a highly positive Pb anomaly, and are characterized by lack of a clear Eu anomaly despite trace element abundances and isotopic ratios that vary greatly between complexes. The Tongshi complex has high Cs (2.6∼8.5 ppm) and REE abundances (∑REE=112.6∼297 ppm, (La/Yb) N=13.1∼30.9) and MORB-like Sr-Nd-Pb isotopic ratios (( 87Sr/ 86Sr) i<0.704; ε Nd>0; ( 206Pb/ 204Pb) i>18). The Hongshan complex has low REE concentrations (∑REE=28.2∼118.7 ppm, (La/Yb) N=4.6∼14.7) and is moderately enriched as demonstrated by their Sr-Nd isotopic ratios (( 87Sr/ 86Sr) i>0.706; ε Nd<-7). The Longbaoshan complex is extremely REE enriched (∑REE=211.3∼392.6 ppm, (La/Yb) N= 32.4∼60.9) and has an EM2-like Sr-Nd isotopic character (( 87Sr/S 86Sr) i>0.7078; ε Nd<-11). We suggest that the Tongshi complex originated from the asthenosphere and the Hongshan complex and the Longbaoshan complex were derived from the partial melting of previously subduction-modified lithospheric mantle, in response to post-collisional lithospheric extension and asthenospheric upwelling. The occurrence of these alkaline intrusive complexes demonstrates that the lithosphere beneath the region must have been considerably thinned at the time of intrusion of these complexes. This study also shed light on the temporal evolution of the Mesozoic lithosphere and the timing of the lithospheric thinning. © 2005 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72925
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, HFen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorZhou, XHen_HK
dc.contributor.authorYing, JFen_HK
dc.date.accessioned2010-09-06T06:46:24Z-
dc.date.available2010-09-06T06:46:24Z-
dc.date.issued2005en_HK
dc.identifier.citationLithos, 2005, v. 81 n. 1-4, p. 297-317en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72925-
dc.description.abstractMesozoic alkaline intrusive complexes are widespread in the southern portion of the North China Craton and can provide some important constraints on the evolution of the Mesozoic lithosphere beneath the region. Three selected intrusive complexes (Tongshi, Hongshan, and Longbaoshan) are generally high in alkalis (K 2O+Na 2 O=9∼13 wt.%) and Al 2O 3 (14∼21.6 wt.%) and low in CaO and TiO 2 (<0.6 wt.%), with high and variable SiO 2 contents. Rocks from these complexes are all enriched in LREE and LILE (Cs, Rb, Ba, U, Th), depleted in Nb and Ti, have a highly positive Pb anomaly, and are characterized by lack of a clear Eu anomaly despite trace element abundances and isotopic ratios that vary greatly between complexes. The Tongshi complex has high Cs (2.6∼8.5 ppm) and REE abundances (∑REE=112.6∼297 ppm, (La/Yb) N=13.1∼30.9) and MORB-like Sr-Nd-Pb isotopic ratios (( 87Sr/ 86Sr) i<0.704; ε Nd>0; ( 206Pb/ 204Pb) i>18). The Hongshan complex has low REE concentrations (∑REE=28.2∼118.7 ppm, (La/Yb) N=4.6∼14.7) and is moderately enriched as demonstrated by their Sr-Nd isotopic ratios (( 87Sr/ 86Sr) i>0.706; ε Nd<-7). The Longbaoshan complex is extremely REE enriched (∑REE=211.3∼392.6 ppm, (La/Yb) N= 32.4∼60.9) and has an EM2-like Sr-Nd isotopic character (( 87Sr/S 86Sr) i>0.7078; ε Nd<-11). We suggest that the Tongshi complex originated from the asthenosphere and the Hongshan complex and the Longbaoshan complex were derived from the partial melting of previously subduction-modified lithospheric mantle, in response to post-collisional lithospheric extension and asthenospheric upwelling. The occurrence of these alkaline intrusive complexes demonstrates that the lithosphere beneath the region must have been considerably thinned at the time of intrusion of these complexes. This study also shed light on the temporal evolution of the Mesozoic lithosphere and the timing of the lithospheric thinning. © 2005 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/lithosen_HK
dc.relation.ispartofLithosen_HK
dc.rightsLithos. Copyright © Elsevier BV.en_HK
dc.subjectAlkaline intrusive complexen_HK
dc.subjectLithospheric mantleen_HK
dc.subjectMesozoicen_HK
dc.subjectNorth China Cratonen_HK
dc.titleGeochemical constraints on the origin of Mesozoic alkaline intrusive complexes from the North China Craton and tectonic implicationsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=81&spage=297&epage=317&date=2005&atitle=Geochemical+constraints+on+the+origin+of+Mesozoic+alkaline+intrusive+complexes+from+the+North+China+Craton+and+tectonic+implicationsen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2004.12.015en_HK
dc.identifier.scopuseid_2-s2.0-15844390254en_HK
dc.identifier.hkuros108598en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-15844390254&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume81en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage297en_HK
dc.identifier.epage317en_HK
dc.identifier.isiWOS:000228418000014-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridZhang, HF=22137307400en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridZhou, XH=24529257100en_HK
dc.identifier.scopusauthoridYing, JF=7102534977en_HK

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