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Article: Melting of the subcontinental lithospheric mantle by the Emeishan mantle plume; evidence from the basal alkaline basalts in Dongchuan, Yunnan, Southwestern China

TitleMelting of the subcontinental lithospheric mantle by the Emeishan mantle plume; evidence from the basal alkaline basalts in Dongchuan, Yunnan, Southwestern China
Authors
KeywordsEmeishan flood basalts
Mantle plume
Metasomatized subcontinental lithospheric mantle
Partial melting
Tephrite
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2008, v. 100 n. 1-4, p. 93-111 How to Cite?
AbstractThe Emeishan continental flood basalt (ECFB) sequence in Dongchuan, SW China comprises a basal tephrite unit overlain by an upper tholeiitic basalt unit. The upper basalts have high TiO 2 contents (3.2-5.2 wt.%), relatively high rare-earth element (REE) concentrations (40 to 60 ppm La, 12.5 to 16.5 ppm Sm, and 3 to 4 ppm Yb), moderate Zr/Nb and Nb/La ratios (9.3-10.2 and 0.6-0.9, respectively) and relatively high e{open} Nd (t) values, ranging from - 0.94 to 2.3, and are comparable to the high-Ti ECFB elsewhere. The tephrites have relatively high P 2O 5 (1.3-2.0 wt.%), low REE concentrations (e.g., 17 to 23 ppm La, 4 to 5.3 ppm Sm, and 2 to 3 ppm Yb), high Nb/La (2.0-3.9) ratios, low Zr/Nb ratios (2.3-4.2), and extremely low e{open} Nd (t) values (mostly ranging from - 10.6 to - 11.1). The distinct compositional differences between the tephrites and the overlying tholeiitic basalts cannot be explained by either fractional crystallization or crustal contamination of a common parental magma. The tholeiitic basalts formed by partial melting of the Emeishan plume head at a depth where garnet was stable, perhaps > 80 km. We propose that the tephrites were derived from magmas formed when the base of the previously metasomatized, volatile-mineral bearing subcontinental lithospheric mantle was heated by the upwelling mantle plume. © 2007.
Persistent Identifierhttp://hdl.handle.net/10722/72842
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSong, XYen_HK
dc.contributor.authorQi, HWen_HK
dc.contributor.authorRobinson, PTen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorCao, ZMen_HK
dc.contributor.authorChen, LMen_HK
dc.date.accessioned2010-09-06T06:45:37Z-
dc.date.available2010-09-06T06:45:37Z-
dc.date.issued2008en_HK
dc.identifier.citationLithos, 2008, v. 100 n. 1-4, p. 93-111en_HK
dc.identifier.issn0024-4937en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72842-
dc.description.abstractThe Emeishan continental flood basalt (ECFB) sequence in Dongchuan, SW China comprises a basal tephrite unit overlain by an upper tholeiitic basalt unit. The upper basalts have high TiO 2 contents (3.2-5.2 wt.%), relatively high rare-earth element (REE) concentrations (40 to 60 ppm La, 12.5 to 16.5 ppm Sm, and 3 to 4 ppm Yb), moderate Zr/Nb and Nb/La ratios (9.3-10.2 and 0.6-0.9, respectively) and relatively high e{open} Nd (t) values, ranging from - 0.94 to 2.3, and are comparable to the high-Ti ECFB elsewhere. The tephrites have relatively high P 2O 5 (1.3-2.0 wt.%), low REE concentrations (e.g., 17 to 23 ppm La, 4 to 5.3 ppm Sm, and 2 to 3 ppm Yb), high Nb/La (2.0-3.9) ratios, low Zr/Nb ratios (2.3-4.2), and extremely low e{open} Nd (t) values (mostly ranging from - 10.6 to - 11.1). The distinct compositional differences between the tephrites and the overlying tholeiitic basalts cannot be explained by either fractional crystallization or crustal contamination of a common parental magma. The tholeiitic basalts formed by partial melting of the Emeishan plume head at a depth where garnet was stable, perhaps > 80 km. We propose that the tephrites were derived from magmas formed when the base of the previously metasomatized, volatile-mineral bearing subcontinental lithospheric mantle was heated by the upwelling mantle plume. © 2007.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.-
dc.subjectEmeishan flood basaltsen_HK
dc.subjectMantle plumeen_HK
dc.subjectMetasomatized subcontinental lithospheric mantleen_HK
dc.subjectPartial meltingen_HK
dc.subjectTephriteen_HK
dc.titleMelting of the subcontinental lithospheric mantle by the Emeishan mantle plume; evidence from the basal alkaline basalts in Dongchuan, Yunnan, Southwestern Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0024-4937&volume=100&issue=1-4&spage=93&epage=111&date=2008&atitle=Melting+of+the+subcontinental+lithospheric+mantle+by+the+Emeishan+mantle+plume;+evidence+from+the+basal+alkaline+basalts+in+Dongchuan,+Yunnan,+Southwestern+Chinaen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.lithos.2007.06.023en_HK
dc.identifier.scopuseid_2-s2.0-37549019272en_HK
dc.identifier.hkuros144287en_HK
dc.identifier.hkuros167301-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-37549019272&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume100en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage93en_HK
dc.identifier.epage111en_HK
dc.identifier.isiWOS:000253034500005-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridSong, XY=7402269092en_HK
dc.identifier.scopusauthoridQi, HW=7202348798en_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridCao, ZM=9633826000en_HK
dc.identifier.scopusauthoridChen, LM=49260952700en_HK

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