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Article: Origin of Fe-Ti oxide ores in mafic intrusions: Evidence from the Panzhihua intrusion, SW China

TitleOrigin of Fe-Ti oxide ores in mafic intrusions: Evidence from the Panzhihua intrusion, SW China
Authors
KeywordsELIP
Fe-Ti oxide ore
Layered intrusion
Panzhihua
QUILF
Issue Date2008
PublisherOxford University Press. The Journal's web site is located at http://petrology.oxfordjournals.org/
Citation
Journal Of Petrology, 2008, v. 49 n. 2, p. 295-313 How to Cite?
AbstractEconomic concentrations of Fe-Ti oxides occur as massive, conformable lenses or layers in the lower part of the Panzhihua intrusion, Emeishan Large Igneous Province, SW China. Mineral chemistry, textures and QUILF equilibria indicate that oxides in rocks of the intrusion were subjected to extensive subsolidus re-equilibration and exsolution. The primary oxide, reconstructed from compositions of titanomagnetite in the ores and associated intergrowths, is an aluminous titanomagnetite (Usp 40) with 40 wt % FeO, 34 wt % Fe 2O 3, 16·5 wt % TiO 2, 5·3 wt % Al 2 O 3, 3·5 wt % MgO and 0·5 wt % MnO. This composition is similar to the bulk composition of the oxide ore, as inferred from whole-rock data. This similarity strongly suggests that the ores formed from accumulation of titanomagnetite crystals, not from immiscible oxide melt as proposed in earlier studies. The occurrence of oxide ores in the lower parts of the Panzhihua intrusion is best explained by settling and sorting of dense titanomagnetite in the ferrogabbroic parental magma. This magma must have crystallized Fe-Ti oxides relatively early and abundantly, and is likely to have been enriched in Fe and Ti but poor in SiO 2. These features are consistent with fractionation of mantle-derived melts under relatively high pressures (∼10 kbar), followed by emplacement of the residual magma at ∼5 kbar. This study provides definitive field and geochemical evidence that Fe-Ti oxide ores can form by accumulation in ferrogabbro. We suggest that many other massive Fe-Ti oxide deposits may have formed in a similar fashion and that high concentrations of phosphorus or carbon, or periodic fluctuation of f O 2 in the magma, are of secondary importance in ore formation. © The Author 2007. Published by Oxford University Press. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72459
ISSN
2015 Impact Factor: 3.768
2015 SCImago Journal Rankings: 2.992
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorPang, KNen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorLindsley, Den_HK
dc.contributor.authorZhao, Den_HK
dc.contributor.authorMalpas, Jen_HK
dc.date.accessioned2010-09-06T06:42:01Z-
dc.date.available2010-09-06T06:42:01Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Petrology, 2008, v. 49 n. 2, p. 295-313en_HK
dc.identifier.issn0022-3530en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72459-
dc.description.abstractEconomic concentrations of Fe-Ti oxides occur as massive, conformable lenses or layers in the lower part of the Panzhihua intrusion, Emeishan Large Igneous Province, SW China. Mineral chemistry, textures and QUILF equilibria indicate that oxides in rocks of the intrusion were subjected to extensive subsolidus re-equilibration and exsolution. The primary oxide, reconstructed from compositions of titanomagnetite in the ores and associated intergrowths, is an aluminous titanomagnetite (Usp 40) with 40 wt % FeO, 34 wt % Fe 2O 3, 16·5 wt % TiO 2, 5·3 wt % Al 2 O 3, 3·5 wt % MgO and 0·5 wt % MnO. This composition is similar to the bulk composition of the oxide ore, as inferred from whole-rock data. This similarity strongly suggests that the ores formed from accumulation of titanomagnetite crystals, not from immiscible oxide melt as proposed in earlier studies. The occurrence of oxide ores in the lower parts of the Panzhihua intrusion is best explained by settling and sorting of dense titanomagnetite in the ferrogabbroic parental magma. This magma must have crystallized Fe-Ti oxides relatively early and abundantly, and is likely to have been enriched in Fe and Ti but poor in SiO 2. These features are consistent with fractionation of mantle-derived melts under relatively high pressures (∼10 kbar), followed by emplacement of the residual magma at ∼5 kbar. This study provides definitive field and geochemical evidence that Fe-Ti oxide ores can form by accumulation in ferrogabbro. We suggest that many other massive Fe-Ti oxide deposits may have formed in a similar fashion and that high concentrations of phosphorus or carbon, or periodic fluctuation of f O 2 in the magma, are of secondary importance in ore formation. © The Author 2007. Published by Oxford University Press. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherOxford University Press. The Journal's web site is located at http://petrology.oxfordjournals.org/en_HK
dc.relation.ispartofJournal of Petrologyen_HK
dc.rightsJournal of Petrology. Copyright © Oxford University Press.en_HK
dc.subjectELIPen_HK
dc.subjectFe-Ti oxide oreen_HK
dc.subjectLayered intrusionen_HK
dc.subjectPanzhihuaen_HK
dc.subjectQUILFen_HK
dc.titleOrigin of Fe-Ti oxide ores in mafic intrusions: Evidence from the Panzhihua intrusion, SW Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-3530&volume=49&issue=2&spage=295&epage=313&date=2008&atitle=Origin+of+Fe-Ti+oxide+ores+in+mafic+intrusions:+Evidence+from+the+Panzhihua+intrusion,+SW+Chinaen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.identifier.authorityMalpas, J=rp00059en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1093/petrology/egm082en_HK
dc.identifier.scopuseid_2-s2.0-39049168225en_HK
dc.identifier.hkuros167302en_HK
dc.identifier.hkuros144296-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-39049168225&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume49en_HK
dc.identifier.issue2en_HK
dc.identifier.spage295en_HK
dc.identifier.epage313en_HK
dc.identifier.isiWOS:000252903400005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridPang, KN=23493522200en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridLindsley, D=7005639623en_HK
dc.identifier.scopusauthoridZhao, D=23394399900en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK

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