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Article: Platinum-group minerals from the Jinbaoshan Pd-Pt deposit, SW China: Evidence for magmatic origin and hydrothermal alteration

TitlePlatinum-group minerals from the Jinbaoshan Pd-Pt deposit, SW China: Evidence for magmatic origin and hydrothermal alteration
Authors
KeywordsChina
Emeishan Large Igneous Province
Hydrothermal alteration
Jinbaoshan
Platinum-group minerals
Pt-Pdores
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. 7, p. 791-803 How to Cite?
AbstractThe Jinbaoshan Pt-Pd deposit in Yunnan, SW China, is hosted in a wehrlite body, which is a member of the Permian (∼260 Ma) Emeishan Large Igneous Province (ELIP). The deposit is reported to contain one million tonnes of Pt-Pd ore grading 0.21% Ni and 0.16% Cu with 3.0 g/t (Pd + Pt). Platinum-group minerals (PGM) mostly are ∼10 μm in diameter, and are commonly Te-, Sn- and As-bearing, including moncheite (PtTe2), atokite (Pd3Sn), kotulskite (PdTe), sperrylite (PtAs2), irarsite (IrAsS), cooperite (PtS), sudburyite (PdSb), and Pt-Fe alloy. Primary rock-forming minerals are olivine and clinopyroxene, with clinopyroxene forming anhedral poikilitic crystals surrounding olivine. Primary chromite occurs either as euhedral grains enclosed within olivine or as an interstitial phase to the olivine. However, the intrusion has undergone extensive hydrothermal alteration. Most olivine grains have been altered to serpentine, and interstitial clinopyroxene is often altered to actinolite/tremolite and locally biotite. Interstitial chromite grains are either partially or totally replaced by secondary magnetite. Base-metal sulfides (BMS), such as pentlandite and chalcopyrite, are usually interstitial to the altered olivine. PGM are located with the BMS and are therefore also interstitial to the serpentinized olivine grains, occurring within altered interstitial clinopyroxene and chromite, or along the edges of these minerals, which predominantly altered to actinolite/tremolite, serpentine and magnetite. Hydrothermal fluids were responsible for the release of the platinum-group elements (PGE) from the BMS to precipitate the PGM at low temperature during pervasive alteration. A sequence of alteration of the PGM has been recognized. Initially moncheite and atokite have been corroded and recrystallized during the formation of actinolite/tremolite, and then, cooperite and moncheite were altered to Pt-Fe alloy where they are in contact with serpentine. Sudburyite occurs in veins indicating late Pd mobility. However, textural evidence shows that the PGM are still in close proximity to the BMS. They occur in PGE-rich layers located at specific igneous horizons in the intrusion, suggesting that PGE were originally magmatic concentrations that, within a PGE-rich horizon, crystallized with BMS late in the olivine/clinopyroxene crystallization sequence and have not been significantly transported during serpentinization and alteration. © Springer-Verlag 2008.
Persistent Identifierhttp://hdl.handle.net/10722/72601
ISSN
2015 Impact Factor: 3.467
2015 SCImago Journal Rankings: 1.677
ISI Accession Number ID
Funding AgencyGrant Number
China National "973" program2007C841/401
Research Grant Council of Hong Kong, SAR, ChinaHKU7057/05P
Funding Information:

This study was supported by China National "973" program (2007C841/401) and a research grant from the Research Grant Council of Hong Kong, SAR, China (HKU7057/05P). Zongyong Zhang and Jingdong Qi from Yunbao Mining Company at Jinbaoshan are thanked for providing great assistance during the field work at Jinbaoshan. Thorough reviews of this manuscript by John F. W. Bowles greatly improved the quality of this paper. Editorial handling by Bernd Lehmann is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, CYen_HK
dc.contributor.authorPrichard, HMen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorFisher, PCen_HK
dc.date.accessioned2010-09-06T06:43:22Z-
dc.date.available2010-09-06T06:43:22Z-
dc.date.issued2008en_HK
dc.identifier.citationMineralium Deposita, 2008, v. 43 n. 7, p. 791-803en_HK
dc.identifier.issn0026-4598en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72601-
dc.description.abstractThe Jinbaoshan Pt-Pd deposit in Yunnan, SW China, is hosted in a wehrlite body, which is a member of the Permian (∼260 Ma) Emeishan Large Igneous Province (ELIP). The deposit is reported to contain one million tonnes of Pt-Pd ore grading 0.21% Ni and 0.16% Cu with 3.0 g/t (Pd + Pt). Platinum-group minerals (PGM) mostly are ∼10 μm in diameter, and are commonly Te-, Sn- and As-bearing, including moncheite (PtTe2), atokite (Pd3Sn), kotulskite (PdTe), sperrylite (PtAs2), irarsite (IrAsS), cooperite (PtS), sudburyite (PdSb), and Pt-Fe alloy. Primary rock-forming minerals are olivine and clinopyroxene, with clinopyroxene forming anhedral poikilitic crystals surrounding olivine. Primary chromite occurs either as euhedral grains enclosed within olivine or as an interstitial phase to the olivine. However, the intrusion has undergone extensive hydrothermal alteration. Most olivine grains have been altered to serpentine, and interstitial clinopyroxene is often altered to actinolite/tremolite and locally biotite. Interstitial chromite grains are either partially or totally replaced by secondary magnetite. Base-metal sulfides (BMS), such as pentlandite and chalcopyrite, are usually interstitial to the altered olivine. PGM are located with the BMS and are therefore also interstitial to the serpentinized olivine grains, occurring within altered interstitial clinopyroxene and chromite, or along the edges of these minerals, which predominantly altered to actinolite/tremolite, serpentine and magnetite. Hydrothermal fluids were responsible for the release of the platinum-group elements (PGE) from the BMS to precipitate the PGM at low temperature during pervasive alteration. A sequence of alteration of the PGM has been recognized. Initially moncheite and atokite have been corroded and recrystallized during the formation of actinolite/tremolite, and then, cooperite and moncheite were altered to Pt-Fe alloy where they are in contact with serpentine. Sudburyite occurs in veins indicating late Pd mobility. However, textural evidence shows that the PGM are still in close proximity to the BMS. They occur in PGE-rich layers located at specific igneous horizons in the intrusion, suggesting that PGE were originally magmatic concentrations that, within a PGE-rich horizon, crystallized with BMS late in the olivine/clinopyroxene crystallization sequence and have not been significantly transported during serpentinization and alteration. © 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 Large Igneous Provinceen_HK
dc.subjectHydrothermal alterationen_HK
dc.subjectJinbaoshanen_HK
dc.subjectPlatinum-group mineralsen_HK
dc.subjectPt-Pdoresen_HK
dc.titlePlatinum-group minerals from the Jinbaoshan Pd-Pt deposit, SW China: Evidence for magmatic origin and hydrothermal alterationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0026-4598&volume=43&spage=791&epage=803&date=2008&atitle=Platinum-group+minerals+from+the+Jinbaoshan+Pd-Pt+deposit,+SW+China:+evidence+for+magmatic+origin+and+hydrothermal+alterationen_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/s00126-008-0196-0en_HK
dc.identifier.scopuseid_2-s2.0-51249090311en_HK
dc.identifier.hkuros153186en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-51249090311&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue7en_HK
dc.identifier.spage791en_HK
dc.identifier.epage803en_HK
dc.identifier.isiWOS:000258718500005-
dc.publisher.placeGermanyen_HK
dc.identifier.scopusauthoridWang, CY=35849436700en_HK
dc.identifier.scopusauthoridPrichard, HM=35565229600en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridFisher, PC=7402666721en_HK
dc.identifier.citeulike3246032-

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