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Article: The PGE and base-metal alloys in the podiform chromitites of the Luobusa ophiolite, southern Tibet

TitleThe PGE and base-metal alloys in the podiform chromitites of the Luobusa ophiolite, southern Tibet
Authors
KeywordsBase-metal alloys
Chromitites
Luobusa
Ophiolite
PGE minerals
Tibet
Issue Date2000
PublisherMineralogical Association of Canada. The Journal's web site is located at http://www.mineralogicalassociation.ca/template/EJournal/
Citation
Canadian Mineralogist, 2000, v. 38 n. 3, p. 585-598 How to Cite?
AbstractPGE and base-metal alloy minerals from podiform chromitites of the Luobusa ophiolite, southern Tibet include Os-Ir, Os-Ir-Ru, Pt-Fe, Ir-Ni-Fe, Fe-Ni-Cr, and Fe-Co with highly variable compositions. Small amounts of diamond, graphite, SiC, an unnamed chromium carbide, iron silicide (Fe-Si), and native Fe, Ni, Cr, Au, Cu and Si also are present. The alloys and native elements were recovered primarily from heavy-mineral separates of the chromitites, but some are included in, or attached to, magnesiochromite grains. They are mostly subhedral to anhedral and range in size from about 0.05 to 0.5 mm. Some grains have euhedral crystal forms and others have round shapes, suggestive of melt droplets. Fe-Ni-bearing, Ru-rich PGE alloys, Fe-Ni and Fe-Co alloys and native Fe and Ni in the Luobusa chromitites are interpreted as secondary minerals formed by alteration of PGE sulfides. The Pt-Fe, Os-Ir, and Ir-Ni-Fe alloys, Fe silicide and perhaps the native Si are considered to be xenocrysts from the mantle, transported to shallow depths by a rising plume and then captured by the melts from which the Luobusa chromitites crystallized.
Persistent Identifierhttp://hdl.handle.net/10722/151033
ISSN
2015 Impact Factor: 0.862
2015 SCImago Journal Rankings: 0.591
References

 

DC FieldValueLanguage
dc.contributor.authorBai, Wen_HK
dc.contributor.authorRobinson, PTen_HK
dc.contributor.authorFang, Qen_HK
dc.contributor.authorYang, Jen_HK
dc.contributor.authorYan, Ben_HK
dc.contributor.authorZhang, Zen_HK
dc.contributor.authorHu, XFen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorMalpas, Jen_HK
dc.date.accessioned2012-06-26T06:16:16Z-
dc.date.available2012-06-26T06:16:16Z-
dc.date.issued2000en_HK
dc.identifier.citationCanadian Mineralogist, 2000, v. 38 n. 3, p. 585-598en_HK
dc.identifier.issn0008-4476en_HK
dc.identifier.urihttp://hdl.handle.net/10722/151033-
dc.description.abstractPGE and base-metal alloy minerals from podiform chromitites of the Luobusa ophiolite, southern Tibet include Os-Ir, Os-Ir-Ru, Pt-Fe, Ir-Ni-Fe, Fe-Ni-Cr, and Fe-Co with highly variable compositions. Small amounts of diamond, graphite, SiC, an unnamed chromium carbide, iron silicide (Fe-Si), and native Fe, Ni, Cr, Au, Cu and Si also are present. The alloys and native elements were recovered primarily from heavy-mineral separates of the chromitites, but some are included in, or attached to, magnesiochromite grains. They are mostly subhedral to anhedral and range in size from about 0.05 to 0.5 mm. Some grains have euhedral crystal forms and others have round shapes, suggestive of melt droplets. Fe-Ni-bearing, Ru-rich PGE alloys, Fe-Ni and Fe-Co alloys and native Fe and Ni in the Luobusa chromitites are interpreted as secondary minerals formed by alteration of PGE sulfides. The Pt-Fe, Os-Ir, and Ir-Ni-Fe alloys, Fe silicide and perhaps the native Si are considered to be xenocrysts from the mantle, transported to shallow depths by a rising plume and then captured by the melts from which the Luobusa chromitites crystallized.en_HK
dc.languageengen_US
dc.publisherMineralogical Association of Canada. The Journal's web site is located at http://www.mineralogicalassociation.ca/template/EJournal/en_HK
dc.relation.ispartofCanadian Mineralogisten_HK
dc.subjectBase-metal alloysen_HK
dc.subjectChromititesen_HK
dc.subjectLuobusaen_HK
dc.subjectOphioliteen_HK
dc.subjectPGE mineralsen_HK
dc.subjectTibeten_HK
dc.titleThe PGE and base-metal alloys in the podiform chromitites of the Luobusa ophiolite, southern Tibeten_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.scopuseid_2-s2.0-0033828697en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033828697&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue3en_HK
dc.identifier.spage585en_HK
dc.identifier.epage598en_HK
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridBai, W=9271474700en_HK
dc.identifier.scopusauthoridRobinson, PT=7403720506en_HK
dc.identifier.scopusauthoridFang, Q=7202644200en_HK
dc.identifier.scopusauthoridYang, J=8871818900en_HK
dc.identifier.scopusauthoridYan, B=7201858637en_HK
dc.identifier.scopusauthoridZhang, Z=8966332300en_HK
dc.identifier.scopusauthoridHu, XF=7404710867en_HK
dc.identifier.scopusauthoridZhou, MF=7403506005en_HK
dc.identifier.scopusauthoridMalpas, J=7006136845en_HK

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