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Article: Genetic relationships between base-metal sulfides and platinum-group minerals in the Yangliuping Ni-Cu-(PGE) sulfide deposit, southwestern China

TitleGenetic relationships between base-metal sulfides and platinum-group minerals in the Yangliuping Ni-Cu-(PGE) sulfide deposit, southwestern China
Authors
KeywordsBase-Metal Sulfides
China
Fractional Crystallization
Platinum-Group Minerals
Sulfide Melt
Yangliuping
Issue Date2004
PublisherMineralogical Association of Canada. The Journal's web site is located at http://www.mineralogicalassociation.ca/template/EJournal/
Citation
Canadian Mineralogist, 2004, v. 42 n. 2, p. 469-483 How to Cite?
AbstractThe Yangliuping Ni-Cu-(PGF) sulfide deposit in southwestern China is hosted by a series of mafic-ultramafic sills that intrude Devonian strata. Massive sulfides and disseminated sulfides occur at the base of the sills. Minor massive sulfide veins occur in footwall fractures. The major base-metal sulfides (BMS) are pyrrhostite, pentlandite, and chalcopyrite. The most common PGE-bearing sulfarsenide is a Pd-bearing cobaltite-gersdorffite solid solution. Other PGM identified include sperrylite, testibiopalladite, and Pd-bearing melonite. All grains of the cobaltite-gersdouffite solid solution and PGM are enclosed in pyrrhotite and pentlandite. Both the PGM and their host BMS have been partially altered in place by hydrothermal fluids. Electron-microprobe analyses show that pyrrhotite and pentlandite contain up to 0.1-0.5 wt% Pt. Euhedral grains of cobaltite-gersdorffite solid solution (<30 μm in diameter) are zoned, with a Rh-Pt-Ni-rich core containing up to 6.4 wt% Rh and 0.5% Pt, and a Co-rich margin. Textural relations suggest that the Pt-bearing coballite-gersdorffite solid solution crystallized before exsolution of pentlandite from monosulfide solid-solution i.e., probably above >600°C based on the phase relations of the system FeAsS-NiAsS-CoAsS. Sperrylite and testibiopalladite crystals are up to 50-80 μm in diameter and are compositionally homogeneous. Some testibiopalladite crystals occur in the contact of two pyrrhotite grains. Monosulfide solid-solution was the first phase to crystallize from a sulfide melt, and it then exsolved to pyrrhotite and pentlandite. Pt and Pd became enriched in the residual sulfide liquid, and crystallized as PGM and Pd-bearing cobaltite-gersdorffite solid solution at a lower temperature. Minor Pt and Pd in Mss were finally expelled from the structure below 800°C.
Persistent Identifierhttp://hdl.handle.net/10722/151176
ISSN
2015 Impact Factor: 0.862
2015 SCImago Journal Rankings: 0.591
References

 

DC FieldValueLanguage
dc.contributor.authorSong, XYen_US
dc.contributor.authorZhou, MFen_US
dc.contributor.authorCao, ZMen_US
dc.date.accessioned2012-06-26T06:18:15Z-
dc.date.available2012-06-26T06:18:15Z-
dc.date.issued2004en_US
dc.identifier.citationCanadian Mineralogist, 2004, v. 42 n. 2, p. 469-483en_US
dc.identifier.issn0008-4476en_US
dc.identifier.urihttp://hdl.handle.net/10722/151176-
dc.description.abstractThe Yangliuping Ni-Cu-(PGF) sulfide deposit in southwestern China is hosted by a series of mafic-ultramafic sills that intrude Devonian strata. Massive sulfides and disseminated sulfides occur at the base of the sills. Minor massive sulfide veins occur in footwall fractures. The major base-metal sulfides (BMS) are pyrrhostite, pentlandite, and chalcopyrite. The most common PGE-bearing sulfarsenide is a Pd-bearing cobaltite-gersdorffite solid solution. Other PGM identified include sperrylite, testibiopalladite, and Pd-bearing melonite. All grains of the cobaltite-gersdouffite solid solution and PGM are enclosed in pyrrhotite and pentlandite. Both the PGM and their host BMS have been partially altered in place by hydrothermal fluids. Electron-microprobe analyses show that pyrrhotite and pentlandite contain up to 0.1-0.5 wt% Pt. Euhedral grains of cobaltite-gersdorffite solid solution (<30 μm in diameter) are zoned, with a Rh-Pt-Ni-rich core containing up to 6.4 wt% Rh and 0.5% Pt, and a Co-rich margin. Textural relations suggest that the Pt-bearing coballite-gersdorffite solid solution crystallized before exsolution of pentlandite from monosulfide solid-solution i.e., probably above >600°C based on the phase relations of the system FeAsS-NiAsS-CoAsS. Sperrylite and testibiopalladite crystals are up to 50-80 μm in diameter and are compositionally homogeneous. Some testibiopalladite crystals occur in the contact of two pyrrhotite grains. Monosulfide solid-solution was the first phase to crystallize from a sulfide melt, and it then exsolved to pyrrhotite and pentlandite. Pt and Pd became enriched in the residual sulfide liquid, and crystallized as PGM and Pd-bearing cobaltite-gersdorffite solid solution at a lower temperature. Minor Pt and Pd in Mss were finally expelled from the structure below 800°C.en_US
dc.languageengen_US
dc.publisherMineralogical Association of Canada. The Journal's web site is located at http://www.mineralogicalassociation.ca/template/EJournal/en_US
dc.relation.ispartofCanadian Mineralogisten_US
dc.subjectBase-Metal Sulfidesen_US
dc.subjectChinaen_US
dc.subjectFractional Crystallizationen_US
dc.subjectPlatinum-Group Mineralsen_US
dc.subjectSulfide Melten_US
dc.subjectYangliupingen_US
dc.titleGenetic relationships between base-metal sulfides and platinum-group minerals in the Yangliuping Ni-Cu-(PGE) sulfide deposit, southwestern Chinaen_US
dc.typeArticleen_US
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-3142664715en_US
dc.identifier.hkuros109809-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-3142664715&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume42en_US
dc.identifier.issue2en_US
dc.identifier.spage469en_US
dc.identifier.epage483en_US
dc.publisher.placeCanadaen_US
dc.identifier.scopusauthoridSong, XY=7402269092en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.identifier.scopusauthoridCao, ZM=7402432464en_US

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