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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Title	Elemental and Sr-Nd-Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: Implications for lithospheric mantle evolution
Authors	Zhao, JH1 2 Hu, R1 Zhou, MF2 Liu, S1
Keywords	Mafic dykes Mantle evolution Mesozoic SE China
Issue Date	2007
Publisher	Cambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
Citation	Geological Magazine, 2007, v. 144 n. 6, p. 937-952 [How to Cite?] DOI: http://dx.doi.org/10.1017/S0016756807003834
Abstract	Abstract 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.
ISSN	0016-7568 2011 Impact Factor: 1.764 2011 SCImago Journal Rankings: 0.061
DOI	http://dx.doi.org/10.1017/S0016756807003834
References	References in Scopus

DC Field	Value
dc.contributor.author	Zhao, JH
dc.contributor.author	Hu, R
dc.contributor.author	Zhou, MF
dc.contributor.author	Liu, S
dc.date.accessioned	2010-04-12T01:31:13Z
dc.date.available	2010-04-12T01:31:13Z
dc.date.issued	2007
dc.description.abstract	Abstract 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.nature	published_or_final_version
dc.identifier.citation	Geological Magazine, 2007, v. 144 n. 6, p. 937-952 [How to Cite?] DOI: http://dx.doi.org/10.1017/S0016756807003834
dc.identifier.doi	http://dx.doi.org/10.1017/S0016756807003834
dc.identifier.epage	952
dc.identifier.hkuros	144262
dc.identifier.issn	0016-7568 2011 Impact Factor: 1.764 2011 SCImago Journal Rankings: 0.061
dc.identifier.issue	6
dc.identifier.openurl
dc.identifier.scopus	eid_2-s2.0-35648950704
dc.identifier.spage	937
dc.identifier.uri	http://hdl.handle.net/10722/57263
dc.identifier.volume	144
dc.language	eng
dc.publisher	Cambridge University Press. The Journal's web site is located at http://journals.cambridge.org/action/displayJournal?jid=GEO
dc.publisher.place	United Kingdom
dc.relation.ispartof	Geological Magazine
dc.relation.references	References in Scopus
dc.rights	Geological Magazine. Copyright © Cambridge University Press.
dc.rights	Creative Commons: Attribution 3.0 Hong Kong License
dc.subject	Mafic dykes
dc.subject	Mantle evolution
dc.subject	Mesozoic
dc.subject	SE China
dc.title	Elemental and Sr-Nd-Pb isotopic geochemistry of Mesozoic mafic intrusions in southern Fujian Province, SE China: Implications for lithospheric mantle evolution
dc.type	Article

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Author Affiliations

Institute of Geochemistry Chinese Academy of Sciences
The University of Hong Kong