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Article: Interaction of magma with sedimentary wall rock and magnetite ore genesis in the Panzhihua mafic intrusion, SW China

TitleInteraction of magma with sedimentary wall rock and magnetite ore genesis in the Panzhihua mafic intrusion, SW China
Authors
KeywordsChina
Emeishan LIP
Magnetite ore
Oxygen fugacity
Panzhihua
Skarn
Issue Date2008
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htm
Citation
Mineralium Deposita, 2008, v. 43 n. 6, p. 677-694 How to Cite?
AbstractIn southwestern China, several large magmatic Fe-Ti-V oxide ore deposits are hosted by gabbroic intrusions associated with the Emeishan flood basalts. The Panzhihua gabbroic intrusion, a little deformed sill that contains a large titanomagnetite deposit at its base, concordantly intrudes late-Proterozoic dolostones. Mineralogical and chemical studies of the contact aureole in the footwall dolostones demonstrate that the metamorphism was largely isochemical but released large quantities of CO2 as the rocks were converted to marble and skarns during intrusion of the gabbroic magma. Petrological modelling of the crystallization of the intrusion, using H2O-poor Emeishan basalt as parent magma, shows that under normal conditions, Fe-Ti oxides crystallize at a late stage, after the crystallization of abundant olivine, clinopyroxene and plagioclase. In order for titanomagnetite to separate efficiently to form the ore deposit, this mineral must have crystallized earlier and close to the liquidus. We propose that CO2-rich fluids released during decarbonatization of sedimentary floor rocks passed up through the magma. Redox equilibria calculations show that when magma with the composition of Emeishan basalt is fluxed by a CO2-rich gas phase, its equilibrium oxygen fugacity (fO2) increases from the fayalite-magnetite-quartz buffer (FMQ) to FMQ + 1.5. From experimental constraints on magnetite saturation in basaltic magma under controlled fO2, such an oxidizing event would allow magnetite to crystallize near to the liquidus, leading to the formation of the deposit. © Springer-Verlag 2008.
Persistent Identifierhttp://hdl.handle.net/10722/72507
ISSN
2015 Impact Factor: 3.467
2015 SCImago Journal Rankings: 1.677
ISI Accession Number ID
Funding AgencyGrant Number
French CNRS (DyETI programme)
Funding Information:

We express our gratitude to Fernando Tornos, Chris Harris and Michael Toplis for their constructive comments and their help with the preparation of the manuscript. We thank J. Gregory Shellnutt for interesting and useful discussions, Professor Yuxiao Ma for providing assistance during our fieldwork and Adeline Besnault for her assistance with the geochemical analyses. Constructive and helpful reviews were provided by Bernd Lehmann, Peter Lightfoot, Steve Prevec and an anonymous reviewer. The project was initiated during a PROCORE exchange program between France and the Hong Kong Research Grants Council. Financial support for the research was obtained from the French CNRS (DyETI programme).

References

 

DC FieldValueLanguage
dc.contributor.authorGanino, Cen_HK
dc.contributor.authorArndt, NTen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorGaillard, Fen_HK
dc.contributor.authorChauvel, Cen_HK
dc.date.accessioned2010-09-06T06:42:29Z-
dc.date.available2010-09-06T06:42:29Z-
dc.date.issued2008en_HK
dc.identifier.citationMineralium Deposita, 2008, v. 43 n. 6, p. 677-694en_HK
dc.identifier.issn0026-4598en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72507-
dc.description.abstractIn southwestern China, several large magmatic Fe-Ti-V oxide ore deposits are hosted by gabbroic intrusions associated with the Emeishan flood basalts. The Panzhihua gabbroic intrusion, a little deformed sill that contains a large titanomagnetite deposit at its base, concordantly intrudes late-Proterozoic dolostones. Mineralogical and chemical studies of the contact aureole in the footwall dolostones demonstrate that the metamorphism was largely isochemical but released large quantities of CO2 as the rocks were converted to marble and skarns during intrusion of the gabbroic magma. Petrological modelling of the crystallization of the intrusion, using H2O-poor Emeishan basalt as parent magma, shows that under normal conditions, Fe-Ti oxides crystallize at a late stage, after the crystallization of abundant olivine, clinopyroxene and plagioclase. In order for titanomagnetite to separate efficiently to form the ore deposit, this mineral must have crystallized earlier and close to the liquidus. We propose that CO2-rich fluids released during decarbonatization of sedimentary floor rocks passed up through the magma. Redox equilibria calculations show that when magma with the composition of Emeishan basalt is fluxed by a CO2-rich gas phase, its equilibrium oxygen fugacity (fO2) increases from the fayalite-magnetite-quartz buffer (FMQ) to FMQ + 1.5. From experimental constraints on magnetite saturation in basaltic magma under controlled fO2, such an oxidizing event would allow magnetite to crystallize near to the liquidus, leading to the formation of the deposit. © Springer-Verlag 2008.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htmen_HK
dc.relation.ispartofMineralium Depositaen_HK
dc.subjectChinaen_HK
dc.subjectEmeishan LIPen_HK
dc.subjectMagnetite oreen_HK
dc.subjectOxygen fugacityen_HK
dc.subjectPanzhihuaen_HK
dc.subjectSkarnen_HK
dc.titleInteraction of magma with sedimentary wall rock and magnetite ore genesis in the Panzhihua mafic intrusion, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0026-4598&volume=43&spage=677&epage=694&date=2008&atitle=Interaction+of+magma+with+sedimentary+wall+rock+and+magnetite+ore+genesis+in+the+Panzhihua+mafic+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/s00126-008-0191-5en_HK
dc.identifier.scopuseid_2-s2.0-49449086894en_HK
dc.identifier.hkuros153174en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-49449086894&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue6en_HK
dc.identifier.spage677en_HK
dc.identifier.epage694en_HK
dc.identifier.isiWOS:000258324800006-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridGanino, C=24314682700en_HK
dc.identifier.scopusauthoridArndt, NT=7004860212en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridGaillard, F=7102566425en_HK
dc.identifier.scopusauthoridChauvel, C=7006405638en_HK
dc.identifier.citeulike3149117-

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