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Article: Geochemical constraints on the mantle source of the upper Permian Emeishan continental flood basalts, Southwestern China

TitleGeochemical constraints on the mantle source of the upper Permian Emeishan continental flood basalts, Southwestern China
Authors
Issue Date2001
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 2001, v. 43 n. 3, p. 213-225 How to Cite?
AbstractThe widespread Emeishan igneous province in southwestern China comprises the Emeishan continental flood basalts (ECFB) and associated mafic-ultramafic intrusions. The ECFB have variable SiO 2, ranging from 43.6 to 52.1 wt%, A1 2O 3 from 5.0 to 12.6 wt%, and total alkali (K 2O + Na 2O) from 0.7 to 6.5 wt%. These oxides exhibit negative correlations with MgO (5.4-23.1 wt%), implying fractional crystallization of olivine and clinopyroxene, which occur as phenocrysts in the rocks. Linear correlations between Zr, Nb, and La suggest that crustal contamination is not important. The primitive-mantle-normalized trace-element patterns show that the ECFB are enriched in high-field-strength trace elements, large-ion-lithophile elements, and light-rare-earth elements, similar to ocean-island basalt. Incompatible element ratios of the ECFB, such as Zr/Nb (7-10), Th/La (0.1-0.15), and Rb/Nb (0.9-1.7), differ from those of primitive mantle, N-MORB, and continental crust, but are similar to ocean-island basalts from an enriched mantle source (EM-1). However, the ECFB have isotopic ratios ( 143Nd/ 144Nd = 0.51229 -0.51276 and 87Sr/ 86Sr = 0.70480-0.70647) that imply that the ECFB were derived from a homogeneous, primitive lower mantle carried upward by a mantle plume. We propose that the original melts derived from the mantle plume were contaminated through interaction at shallower depth with an enriched lithospheric mantle. This model suggests that the lithospheric mantle beneath the ECFB was modified by subduction of an oceanic slab.
Persistent Identifierhttp://hdl.handle.net/10722/151052
ISSN
2015 Impact Factor: 2.365
2015 SCImago Journal Rankings: 1.248
References

 

DC FieldValueLanguage
dc.contributor.authorSong, XYen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorHou, ZQen_US
dc.contributor.authorCao, ZMen_US
dc.contributor.authorWang, YLen_US
dc.contributor.authorLi, Yen_US
dc.date.accessioned2012-06-26T06:16:33Z-
dc.date.available2012-06-26T06:16:33Z-
dc.date.issued2001en_US
dc.identifier.citationInternational Geology Review, 2001, v. 43 n. 3, p. 213-225en_US
dc.identifier.issn0020-6814en_US
dc.identifier.urihttp://hdl.handle.net/10722/151052-
dc.description.abstractThe widespread Emeishan igneous province in southwestern China comprises the Emeishan continental flood basalts (ECFB) and associated mafic-ultramafic intrusions. The ECFB have variable SiO 2, ranging from 43.6 to 52.1 wt%, A1 2O 3 from 5.0 to 12.6 wt%, and total alkali (K 2O + Na 2O) from 0.7 to 6.5 wt%. These oxides exhibit negative correlations with MgO (5.4-23.1 wt%), implying fractional crystallization of olivine and clinopyroxene, which occur as phenocrysts in the rocks. Linear correlations between Zr, Nb, and La suggest that crustal contamination is not important. The primitive-mantle-normalized trace-element patterns show that the ECFB are enriched in high-field-strength trace elements, large-ion-lithophile elements, and light-rare-earth elements, similar to ocean-island basalt. Incompatible element ratios of the ECFB, such as Zr/Nb (7-10), Th/La (0.1-0.15), and Rb/Nb (0.9-1.7), differ from those of primitive mantle, N-MORB, and continental crust, but are similar to ocean-island basalts from an enriched mantle source (EM-1). However, the ECFB have isotopic ratios ( 143Nd/ 144Nd = 0.51229 -0.51276 and 87Sr/ 86Sr = 0.70480-0.70647) that imply that the ECFB were derived from a homogeneous, primitive lower mantle carried upward by a mantle plume. We propose that the original melts derived from the mantle plume were contaminated through interaction at shallower depth with an enriched lithospheric mantle. This model suggests that the lithospheric mantle beneath the ECFB was modified by subduction of an oceanic slab.en_US
dc.languageengen_US
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_US
dc.relation.ispartofInternational Geology Reviewen_US
dc.titleGeochemical constraints on the mantle source of the upper Permian Emeishan continental flood basalts, Southwestern Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF:m fzhou@hkucc.hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1080/00206810109465009-
dc.identifier.scopuseid_2-s2.0-0034910519en_US
dc.identifier.hkuros71295-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034910519&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume43en_US
dc.identifier.issue3en_US
dc.identifier.spage213en_US
dc.identifier.epage225en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridSong, XY=7402269092en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridHou, ZQ=7201896566en_US
dc.identifier.scopusauthoridCao, ZM=9633826000en_US
dc.identifier.scopusauthoridWang, YL=7601516613en_US
dc.identifier.scopusauthoridLi, Y=36062199400en_US

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