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Article: Platinum-group element geochemistry of the Hongge Fe-V-Ti deposit in the Pan-Xi area, Southwestern China

TitlePlatinum-group element geochemistry of the Hongge Fe-V-Ti deposit in the Pan-Xi area, Southwestern China
Authors
KeywordsFe-V-Ti Deposit
Hongge Layered Intrusion
Pan-Xi Area
Platinum-Group Elements
Southwestern China
Issue Date2002
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htm
Citation
Mineralium Deposita, 2002, v. 37 n. 2, p. 226-239 How to Cite?
AbstractMafic and ultramafic intrusions in the Pan-Xi area along the western margin of the Yangtze block, southwestern China, are spatially associated with the Late Permian Emeishan flood basalts of the Emeishan Large Igneous Province. The Hongge layered intrusion is one of the plutonic bodies of this province and hosts a giant Fe-V-Ti deposit. This intrusion has three zones: a lower, olivine clinopyroxenite zone, a middle, clinopyroxenite zone, and an upper, gabbro zone. Each of these zones consists of one or two compositional cycles, which have distinct Mg# values, TiO 2 concentrations and total REE contents. The middle clinopyroxenite zone and upper gabbro zone contain thick (14-84 m) magnetite-mineralized layers. Samples from the lower olivine clinopyroxenite zone and middle clinopyroxenite zone of the Hongge intrusion are enriched in platinum and palladium relative to iridium and ruthenium. Rocks of the lower olivine clinopyroxenite zone have Pd/Ir ratios (1.8-22.3) lower than those of the middle clinopyroxenite zone (6.2 to 83 in its lower part and 3.6 to 49 in its upper part). The Pd/Ir ratios increase progressively upwards in each cyclic unit. Chromite is the major phase controlling concentrations of iridium and ruthenium. The Cu/Pd ratios at the bottom of each cyclic unit are close to that of the mantle and increase upwards. This variation suggests that each cyclic unit represents a new batch of magma, and sulfide mineral segregation removes PGE (platinum-group elements). Ni and Cu. Each cyclic unit in the Hongge layered intrusion might have resulted from crystal fractionation and mixing between a primary and evolved magma. The high Cu/ Pd, Ti/Pd, Ni/Pd and Cu/Ir ratios of the intrusion suggest that the sulfide mineral segregation may have played an important role in PGE differentiation. If this interpretation is correct, then there is a potential to find economic PGE-rich horizon in the Hongge-type intrusions in the region.
Persistent Identifierhttp://hdl.handle.net/10722/151080
ISSN
2015 Impact Factor: 3.467
2015 SCImago Journal Rankings: 1.677
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhong, Hen_US
dc.contributor.authorZhou, XHen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorLiu, BGen_US
dc.date.accessioned2012-06-26T06:16:50Z-
dc.date.available2012-06-26T06:16:50Z-
dc.date.issued2002en_US
dc.identifier.citationMineralium Deposita, 2002, v. 37 n. 2, p. 226-239en_US
dc.identifier.issn0026-4598en_US
dc.identifier.urihttp://hdl.handle.net/10722/151080-
dc.description.abstractMafic and ultramafic intrusions in the Pan-Xi area along the western margin of the Yangtze block, southwestern China, are spatially associated with the Late Permian Emeishan flood basalts of the Emeishan Large Igneous Province. The Hongge layered intrusion is one of the plutonic bodies of this province and hosts a giant Fe-V-Ti deposit. This intrusion has three zones: a lower, olivine clinopyroxenite zone, a middle, clinopyroxenite zone, and an upper, gabbro zone. Each of these zones consists of one or two compositional cycles, which have distinct Mg# values, TiO 2 concentrations and total REE contents. The middle clinopyroxenite zone and upper gabbro zone contain thick (14-84 m) magnetite-mineralized layers. Samples from the lower olivine clinopyroxenite zone and middle clinopyroxenite zone of the Hongge intrusion are enriched in platinum and palladium relative to iridium and ruthenium. Rocks of the lower olivine clinopyroxenite zone have Pd/Ir ratios (1.8-22.3) lower than those of the middle clinopyroxenite zone (6.2 to 83 in its lower part and 3.6 to 49 in its upper part). The Pd/Ir ratios increase progressively upwards in each cyclic unit. Chromite is the major phase controlling concentrations of iridium and ruthenium. The Cu/Pd ratios at the bottom of each cyclic unit are close to that of the mantle and increase upwards. This variation suggests that each cyclic unit represents a new batch of magma, and sulfide mineral segregation removes PGE (platinum-group elements). Ni and Cu. Each cyclic unit in the Hongge layered intrusion might have resulted from crystal fractionation and mixing between a primary and evolved magma. The high Cu/ Pd, Ti/Pd, Ni/Pd and Cu/Ir ratios of the intrusion suggest that the sulfide mineral segregation may have played an important role in PGE differentiation. If this interpretation is correct, then there is a potential to find economic PGE-rich horizon in the Hongge-type intrusions in the region.en_US
dc.languageengen_US
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00126/index.htmen_US
dc.relation.ispartofMineralium Depositaen_US
dc.subjectFe-V-Ti Depositen_US
dc.subjectHongge Layered Intrusionen_US
dc.subjectPan-Xi Areaen_US
dc.subjectPlatinum-Group Elementsen_US
dc.subjectSouthwestern Chinaen_US
dc.titlePlatinum-group element geochemistry of the Hongge Fe-V-Ti deposit in the Pan-Xi area, Southwestern Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1007/s00126-001-0220-0en_US
dc.identifier.scopuseid_2-s2.0-0036207961en_US
dc.identifier.hkuros71243-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036207961&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume37en_US
dc.identifier.issue2en_US
dc.identifier.spage226en_US
dc.identifier.epage239en_US
dc.identifier.isiWOS:000177382800007-
dc.publisher.placeGermanyen_US
dc.identifier.scopusauthoridZhong, H=35785435900en_US
dc.identifier.scopusauthoridZhou, XH=7410089813en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridLiu, BG=26661991400en_US
dc.customcontrol.immutablesml 130308-

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