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Article: Permian flood basalts and mafic intrusions in the Jinping (SW China)-Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregation

TitlePermian flood basalts and mafic intrusions in the Jinping (SW China)-Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregation
Authors
KeywordsEmeishan large igneous province
Flood basalts
Geochemistry
Mafic intrusions
Northern Vietnam
SW China
Issue Date2007
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 2007, v. 243 n. 3-4, p. 317-343 How to Cite?
AbstractThe ∼ 260-Ma Emeishan large igneous province (ELIP) in SW China and northern Vietnam includes high-Ti and low-Ti volcanic rocks and coeval mafic-ultramafic plutons. In the Jinping (SW China)-Song Da (northern Vietnam) district, the southernmost part of the ELIP, basalts and gabbros of the high-Ti series displays a narrow range of εNd(t) values (+ 0.5 to + 1.1) and low primitive mantle-normalized Th/Nb ratios (∼ 1.4), similar to those of an OIB-like enriched mantle source. The rocks have chondrite-normalized REE patterns enriched in LREE and depleted in HREE. This feature, together with low Al 2O 3/TiO 2 ratios (∼ 4), indicates that the primary melts were generated by small degrees of partial melting at garnet stable depths. The low-Ti series includes LREE-depleted and LREE-enriched picrites, basalts, olivine gabbros and gabbros. The LREE-depleted picrites have chondrite-normalized Ce/Yb ratios of 0.4-0.5, very positive εNd(t) values (+ 7.0), and very negative Th anomalies in primitive mantle-normalized trace element patterns. They were formed by high degrees of partial melting of a strongly depleted mantle source at relatively shallow mantle depths. The LREE-enriched picrites have very negative εNd(t) values (- 7.8) that indicate a mantle source locally modified by subducted oceanic crust. Highly variable chemical compositions and εNd(t) values (+ 6.4 to - 10.2) of the low-Ti basalts and gabbros are attributed to variable degrees of upper crustal contamination of the picritic parental magmas. Therefore, the extrusive and intrusive rocks in this region clearly formed from heterogeneous mantle sources. Crustal contamination triggered S-saturation of some low-Ti magmas and resulted in segregation of immiscible sulfide melts and generation of magmatic Ni-Cu-(PGE) sulfide deposits in this region. Eruption of magmas after sulfide segregation formed PGE-depleted low-Ti basalts. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72526
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, CYen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorQi, Len_HK
dc.date.accessioned2010-09-06T06:42:40Z-
dc.date.available2010-09-06T06:42:40Z-
dc.date.issued2007en_HK
dc.identifier.citationChemical Geology, 2007, v. 243 n. 3-4, p. 317-343en_HK
dc.identifier.issn0009-2541en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72526-
dc.description.abstractThe ∼ 260-Ma Emeishan large igneous province (ELIP) in SW China and northern Vietnam includes high-Ti and low-Ti volcanic rocks and coeval mafic-ultramafic plutons. In the Jinping (SW China)-Song Da (northern Vietnam) district, the southernmost part of the ELIP, basalts and gabbros of the high-Ti series displays a narrow range of εNd(t) values (+ 0.5 to + 1.1) and low primitive mantle-normalized Th/Nb ratios (∼ 1.4), similar to those of an OIB-like enriched mantle source. The rocks have chondrite-normalized REE patterns enriched in LREE and depleted in HREE. This feature, together with low Al 2O 3/TiO 2 ratios (∼ 4), indicates that the primary melts were generated by small degrees of partial melting at garnet stable depths. The low-Ti series includes LREE-depleted and LREE-enriched picrites, basalts, olivine gabbros and gabbros. The LREE-depleted picrites have chondrite-normalized Ce/Yb ratios of 0.4-0.5, very positive εNd(t) values (+ 7.0), and very negative Th anomalies in primitive mantle-normalized trace element patterns. They were formed by high degrees of partial melting of a strongly depleted mantle source at relatively shallow mantle depths. The LREE-enriched picrites have very negative εNd(t) values (- 7.8) that indicate a mantle source locally modified by subducted oceanic crust. Highly variable chemical compositions and εNd(t) values (+ 6.4 to - 10.2) of the low-Ti basalts and gabbros are attributed to variable degrees of upper crustal contamination of the picritic parental magmas. Therefore, the extrusive and intrusive rocks in this region clearly formed from heterogeneous mantle sources. Crustal contamination triggered S-saturation of some low-Ti magmas and resulted in segregation of immiscible sulfide melts and generation of magmatic Ni-Cu-(PGE) sulfide deposits in this region. Eruption of magmas after sulfide segregation formed PGE-depleted low-Ti basalts. © 2007 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/chemgeoen_HK
dc.relation.ispartofChemical Geologyen_HK
dc.rightsChemical Geology. Copyright © Elsevier BV.-
dc.subjectEmeishan large igneous provinceen_HK
dc.subjectFlood basaltsen_HK
dc.subjectGeochemistryen_HK
dc.subjectMafic intrusionsen_HK
dc.subjectNorthern Vietnamen_HK
dc.subjectSW Chinaen_HK
dc.titlePermian flood basalts and mafic intrusions in the Jinping (SW China)-Song Da (northern Vietnam) district: Mantle sources, crustal contamination and sulfide segregationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0009-2541&volume=243&issue=3-4&spage=317&epage=343&date=2007&atitle=Permian+flood+basalts+and+mafic+intrusions+in+the+Jinping+(SW+China)–Song+Da+(Northern+Vietnam)+district:+mantle+sources,+crustal+contamination+and+sulfide+segregationen_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.chemgeo.2007.05.017en_HK
dc.identifier.scopuseid_2-s2.0-34447638697en_HK
dc.identifier.hkuros167300en_HK
dc.identifier.hkuros144260-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34447638697&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume243en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage317en_HK
dc.identifier.epage343en_HK
dc.identifier.isiWOS:000249186800007-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, CY=34976092700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridQi, L=7202149924en_HK

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