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Article: Elemental and Sr-Nd-Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: Implications for lithospheric mantle evolution
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TitleElemental and Sr-Nd-Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: Implications for lithospheric mantle evolution
 
AuthorsZhao, JH1 2
Hu, R1
Zhou, MF2
Liu, S1
 
KeywordsMafic dykes
Mantle evolution
Mesozoic
SE China
 
Issue Date2007
 
PublisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
 
CitationGeological Magazine, 2007, v. 144 n. 6, p. 937-952 [How to Cite?]
DOI: http://dx.doi.org/10.1017/S0016756807003834
 
AbstractAbstract Cretaceous mafic dykes in Fujian province, SE China provide an opportunity to examine the nature of their mantle source and the secular evolution of the Mesozoic lithospheric mantle beneath SE China. The mafic rocks have SiO2 ranging from 47.42 to 55.40 wt %, Al2O3 from 14.0 wt % to 20.4 wt %, CaO from 4.09 to 11.7 wt % and total alkaline (K2O+Na2O) from 2.15 wt % to 6.59 wt %. Two types are recognized based on their REE and primitive mantle-normalized trace element patterns. Type-A is the dominant Mesozoic mafic rock type in SE China and is characterized by enrichment of light rare earth elements (LREE) ((La/Yb)n = 2.85-19.0) and arc-like trace element geochemistry. Type-P has relatively flat REE patterns ((La/Yb)n = 1.68-3.43) and primitive mantle-like trace element patterns except for enrichment of Rb, Ba and Pb. Type-A samples show EMII signatures on the Sr-Nd isotopic diagram, whereas type-P rocks have high initial 143Nd/144Nd ratios (0.5126-0.5128) relative to the type-A rocks (143Nd/144Nd = 0.5124-0.5127). The type-A rocks have 207Pb/204Pb ranging from 15.47 to 15.67 and 206Pb/204Pb from 18.26 to 18.52. All the type-A rocks show a negative correlation between 143Nd/144Nd and 206Pb/204Pb ratios and a positive relationship between 87Sr/86 Sr and206Pb/204Pb ratios, indicating mixing of a depleted mantle source and an EMII component. Geochemical modelling shows that the parental magmas were formed by 5-15 % partial melting of a spinel lherzolite, and contaminated by less than 1 % melt derived from subducted sediment. The type-P magmas were derived from a mantle source unmodified by subduction components. The wide distribution of type-A dykes in SE China suggests that subduction-modified lithospheric mantle was extensive beneath the Cathaysia Block. Geochemical differences between Mesozoic and Cenozoic mafic rocks indicate that lithospheric thinning beneath SE China occurred in two episodes: firstly by heterogeneous modification by subducted components in early Mesozoic times, and later by chemical-mechanical erosion related to convective upwelling of the asthenosphere during Cenozoic times. © 2007 Cambridge University Press.
 
ISSN0016-7568
2012 Impact Factor: 2.27
2012 SCImago Journal Rankings: 1.186
 
DOIhttp://dx.doi.org/10.1017/S0016756807003834
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorZhao, JH
 
dc.contributor.authorHu, R
 
dc.contributor.authorZhou, MF
 
dc.contributor.authorLiu, S
 
dc.date.accessioned2010-04-12T01:31:13Z
 
dc.date.available2010-04-12T01:31:13Z
 
dc.date.issued2007
 
dc.description.abstractAbstract Cretaceous mafic dykes in Fujian province, SE China provide an opportunity to examine the nature of their mantle source and the secular evolution of the Mesozoic lithospheric mantle beneath SE China. The mafic rocks have SiO2 ranging from 47.42 to 55.40 wt %, Al2O3 from 14.0 wt % to 20.4 wt %, CaO from 4.09 to 11.7 wt % and total alkaline (K2O+Na2O) from 2.15 wt % to 6.59 wt %. Two types are recognized based on their REE and primitive mantle-normalized trace element patterns. Type-A is the dominant Mesozoic mafic rock type in SE China and is characterized by enrichment of light rare earth elements (LREE) ((La/Yb)n = 2.85-19.0) and arc-like trace element geochemistry. Type-P has relatively flat REE patterns ((La/Yb)n = 1.68-3.43) and primitive mantle-like trace element patterns except for enrichment of Rb, Ba and Pb. Type-A samples show EMII signatures on the Sr-Nd isotopic diagram, whereas type-P rocks have high initial 143Nd/144Nd ratios (0.5126-0.5128) relative to the type-A rocks (143Nd/144Nd = 0.5124-0.5127). The type-A rocks have 207Pb/204Pb ranging from 15.47 to 15.67 and 206Pb/204Pb from 18.26 to 18.52. All the type-A rocks show a negative correlation between 143Nd/144Nd and 206Pb/204Pb ratios and a positive relationship between 87Sr/86 Sr and206Pb/204Pb ratios, indicating mixing of a depleted mantle source and an EMII component. Geochemical modelling shows that the parental magmas were formed by 5-15 % partial melting of a spinel lherzolite, and contaminated by less than 1 % melt derived from subducted sediment. The type-P magmas were derived from a mantle source unmodified by subduction components. The wide distribution of type-A dykes in SE China suggests that subduction-modified lithospheric mantle was extensive beneath the Cathaysia Block. Geochemical differences between Mesozoic and Cenozoic mafic rocks indicate that lithospheric thinning beneath SE China occurred in two episodes: firstly by heterogeneous modification by subducted components in early Mesozoic times, and later by chemical-mechanical erosion related to convective upwelling of the asthenosphere during Cenozoic times. © 2007 Cambridge University Press.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationGeological Magazine, 2007, v. 144 n. 6, p. 937-952 [How to Cite?]
DOI: http://dx.doi.org/10.1017/S0016756807003834
 
dc.identifier.doihttp://dx.doi.org/10.1017/S0016756807003834
 
dc.identifier.epage952
 
dc.identifier.hkuros144262
 
dc.identifier.issn0016-7568
2012 Impact Factor: 2.27
2012 SCImago Journal Rankings: 1.186
 
dc.identifier.issue6
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-35648950704
 
dc.identifier.spage937
 
dc.identifier.urihttp://hdl.handle.net/10722/57263
 
dc.identifier.volume144
 
dc.languageeng
 
dc.publisherCambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
 
dc.publisher.placeUnited Kingdom
 
dc.relation.ispartofGeological Magazine
 
dc.relation.referencesReferences in Scopus
 
dc.rightsGeological Magazine. Copyright © Cambridge University Press.
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectMafic dykes
 
dc.subjectMantle evolution
 
dc.subjectMesozoic
 
dc.subjectSE China
 
dc.titleElemental and Sr-Nd-Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: Implications for lithospheric mantle evolution
 
dc.typeArticle
 
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Author Affiliations
  1. Institute of Geochemistry Chinese Academy of Sciences
  2. The University of Hong Kong