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Article: Geochemistry, petrogenesis and metallogenesis of the panzhihua gabbroic layered intrusion and associated Fe-Ti-V Oxide deposits, sichuan province, SW China

TitleGeochemistry, petrogenesis and metallogenesis of the panzhihua gabbroic layered intrusion and associated Fe-Ti-V Oxide deposits, sichuan province, SW China
Authors
KeywordsFE-Ti-rich gabbro
Layered intrusion
Magnetite
Panzhihua
SW China
Issue Date2005
PublisherOxford University Press. The Journal's web site is located at http://petrology.oxfordjournals.org/
Citation
Journal Of Petrology, 2005, v. 46 n. 11, p. 2253-2280 How to Cite?
AbstractThe Panzhihua gabbroic layered intrusion is associated with the 260 Ma Emeishan Large Igneous Province in SW China. This sill-like body hosts a giant Fe-Ti-V oxide deposit with 1333 million ton ore reserves, which makes China a major producer of these metals. The intrusion has a Marginal zone of fine-grained hornblende-bearing gabbro and olivine gabbro, followed upward by Lower, Middle, and Upper zones. The Lower and Middle zones consist of layered melanogabbro and gabbro composed of cumulate clinopyroxene, plagioclase, and olivine. These zones also contain magnetite layers. The Upper zone consists chiefly of leucogabbro composed of plagioclase and clinopyroxene with minor olivine. Most rocks in the body show variable-scale rhythmic modal layering in which dark minerals, primarily clinopyroxene, dominate in the lower parts of each layer, and lighter minerals, primarily plagioclase, dominate in the upper parts. The oxide ores occur as layers and lenses within the gabbros and are concentrated in the lower parts of the intrusion. Ore textures and associated mineral assemblages indicate that the ore bodies formed by very late-stage crystallization of V-rich titanomagnetite from an immiscible oxide liquid in a fluid-rich environment. The rocks of the Panzhihua intrusion become more evolved in chemistry upward and follow a tholeiitic differentiation trend with enrichment in Fe, Ti, and V. They are enriched in light rare earth elements relative to heavy rare earth elements, and exhibit positive Nb, Ta, and Ti anomalies and negative Zr and Hf anomalies. The silicate rocks and oxide ores of the Panzhihua intrusion formed from highly evolved Fe-Ti-V-rich ferrobasaltic or ferropicritic magmas. The textures of the ores and the abundance of minor hydrous phases indicate that addition of fluids from upper crustal wall-rocks induced the separation of the immiscible oxide melts from which the Fe-Ti-V oxide ore bodies in the lower part of the intrusion crystallized. © The Author 2005. Published by Oxford University Press. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151168
ISSN
2015 Impact Factor: 3.768
2015 SCImago Journal Rankings: 2.992
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorRobinson, PTen_HK
dc.contributor.authorLesher, CMen_HK
dc.contributor.authorKeays, RRen_HK
dc.contributor.authorZhang, CJen_HK
dc.contributor.authorMalpas, Jen_HK
dc.date.accessioned2012-06-26T06:18:01Z-
dc.date.available2012-06-26T06:18:01Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal Of Petrology, 2005, v. 46 n. 11, p. 2253-2280en_HK
dc.identifier.issn0022-3530en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151168-
dc.description.abstractThe Panzhihua gabbroic layered intrusion is associated with the 260 Ma Emeishan Large Igneous Province in SW China. This sill-like body hosts a giant Fe-Ti-V oxide deposit with 1333 million ton ore reserves, which makes China a major producer of these metals. The intrusion has a Marginal zone of fine-grained hornblende-bearing gabbro and olivine gabbro, followed upward by Lower, Middle, and Upper zones. The Lower and Middle zones consist of layered melanogabbro and gabbro composed of cumulate clinopyroxene, plagioclase, and olivine. These zones also contain magnetite layers. The Upper zone consists chiefly of leucogabbro composed of plagioclase and clinopyroxene with minor olivine. Most rocks in the body show variable-scale rhythmic modal layering in which dark minerals, primarily clinopyroxene, dominate in the lower parts of each layer, and lighter minerals, primarily plagioclase, dominate in the upper parts. The oxide ores occur as layers and lenses within the gabbros and are concentrated in the lower parts of the intrusion. Ore textures and associated mineral assemblages indicate that the ore bodies formed by very late-stage crystallization of V-rich titanomagnetite from an immiscible oxide liquid in a fluid-rich environment. The rocks of the Panzhihua intrusion become more evolved in chemistry upward and follow a tholeiitic differentiation trend with enrichment in Fe, Ti, and V. They are enriched in light rare earth elements relative to heavy rare earth elements, and exhibit positive Nb, Ta, and Ti anomalies and negative Zr and Hf anomalies. The silicate rocks and oxide ores of the Panzhihua intrusion formed from highly evolved Fe-Ti-V-rich ferrobasaltic or ferropicritic magmas. The textures of the ores and the abundance of minor hydrous phases indicate that addition of fluids from upper crustal wall-rocks induced the separation of the immiscible oxide melts from which the Fe-Ti-V oxide ore bodies in the lower part of the intrusion crystallized. © The Author 2005. Published by Oxford University Press. All rights reserved.en_HK
dc.languageengen_US
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.-
dc.subjectFE-Ti-rich gabbroen_HK
dc.subjectLayered intrusionen_HK
dc.subjectMagnetiteen_HK
dc.subjectPanzhihuaen_HK
dc.subjectSW Chinaen_HK
dc.titleGeochemistry, petrogenesis and metallogenesis of the panzhihua gabbroic layered intrusion and associated Fe-Ti-V Oxide deposits, sichuan province, SW Chinaen_HK
dc.typeArticleen_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_fulltexten_US
dc.identifier.doi10.1093/petrology/egi054en_HK
dc.identifier.scopuseid_2-s2.0-27744517453en_HK
dc.identifier.hkuros123387-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-27744517453&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume46en_HK
dc.identifier.issue11en_HK
dc.identifier.spage2253en_HK
dc.identifier.epage2280en_HK
dc.identifier.isiWOS:000232750500004-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK
dc.identifier.scopusauthoridLesher, CM=7003946127en_HK
dc.identifier.scopusauthoridKeays, RR=7005122208en_HK
dc.identifier.scopusauthoridZhang, CJ=7405496025en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK
dc.identifier.citeulike355904-

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