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Article: Geochemical constraints on the origin of the Permian Baimazhai mafic-ultramafic intrusion, SW China

TitleGeochemical constraints on the origin of the Permian Baimazhai mafic-ultramafic intrusion, SW China
Authors
Issue Date2006
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htm
Citation
Contributions To Mineralogy And Petrology, 2006, v. 152 n. 3, p. 309-321 How to Cite?
AbstractThe ∼260 Ma Baimazhai mafic-ultramafic intrusion is considered to be part of the Emeishan large igneous province and consists of orthopyroxenite surrounded by websterite and gabbro. The intrusion is variably mineralized with a massive sulfide ore body (∼20 vol.%) in the core of the intrusion. Silicate rocks have Ni/Cu ratios ranging from 0.3 to 46 with majority less than 7 and are rich in LREE relative to HREE and show Nb and Ta anomalies in primitive mantle-normalized trace element patterns, with low Nb/Th (1.0-4.5) and Nb/La (0.3-1.0) ratios. Their ε Nd(t) values range from -3.3 to -8.4. Uniform Pd/Pt (0.7-3.5) and Cu/Pd (100,000-400,000) ratios throughout the intrusion indicate that all the sulfides in the rocks were formed in a single sulfide-saturation event. Modeling suggests that the Baimazhai rocks were formed when an Mg-rich magma became crustally contaminated in a deep-seated staging chamber. Crustal contamination (up to ∼35%) drove the magma to S-saturation and forced orthopyroxene (Opx) onto the liquidus. The crystal-bearing magma forced out of the staging chamber was migrated by flow differentiation and consequently, the denser sulfide melt and the Opx crystals became centrally disposed in the flowing magma to form the Baimazhai intrusion. © Springer-Verlag 2006.
Persistent Identifierhttp://hdl.handle.net/10722/73037
ISSN
2015 Impact Factor: 3.218
2015 SCImago Journal Rankings: 2.582
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, CYen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorKeays, RRen_HK
dc.date.accessioned2010-09-06T06:47:27Z-
dc.date.available2010-09-06T06:47:27Z-
dc.date.issued2006en_HK
dc.identifier.citationContributions To Mineralogy And Petrology, 2006, v. 152 n. 3, p. 309-321en_HK
dc.identifier.issn0010-7999en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73037-
dc.description.abstractThe ∼260 Ma Baimazhai mafic-ultramafic intrusion is considered to be part of the Emeishan large igneous province and consists of orthopyroxenite surrounded by websterite and gabbro. The intrusion is variably mineralized with a massive sulfide ore body (∼20 vol.%) in the core of the intrusion. Silicate rocks have Ni/Cu ratios ranging from 0.3 to 46 with majority less than 7 and are rich in LREE relative to HREE and show Nb and Ta anomalies in primitive mantle-normalized trace element patterns, with low Nb/Th (1.0-4.5) and Nb/La (0.3-1.0) ratios. Their ε Nd(t) values range from -3.3 to -8.4. Uniform Pd/Pt (0.7-3.5) and Cu/Pd (100,000-400,000) ratios throughout the intrusion indicate that all the sulfides in the rocks were formed in a single sulfide-saturation event. Modeling suggests that the Baimazhai rocks were formed when an Mg-rich magma became crustally contaminated in a deep-seated staging chamber. Crustal contamination (up to ∼35%) drove the magma to S-saturation and forced orthopyroxene (Opx) onto the liquidus. The crystal-bearing magma forced out of the staging chamber was migrated by flow differentiation and consequently, the denser sulfide melt and the Opx crystals became centrally disposed in the flowing magma to form the Baimazhai intrusion. © Springer-Verlag 2006.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htmen_HK
dc.relation.ispartofContributions to Mineralogy and Petrologyen_HK
dc.titleGeochemical constraints on the origin of the Permian Baimazhai mafic-ultramafic intrusion, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0010-7999&volume=152&issue=3&spage=309&epage=321&date=2006&atitle=Geochemical+constraints+on+the+origin+of+the+Permian+Baimazhai+mafic-ultramafic+intrusion,+SW+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.doi10.1007/s00410-006-0103-6en_HK
dc.identifier.scopuseid_2-s2.0-33747115310en_HK
dc.identifier.hkuros167290en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33747115310&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume152en_HK
dc.identifier.issue3en_HK
dc.identifier.spage309en_HK
dc.identifier.epage321en_HK
dc.identifier.isiWOS:000239813700004-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridWang, CY=35849436700en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridKeays, RR=7005122208en_HK
dc.identifier.citeulike885240-

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