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Article: The PGE and base-metal alloys in the podiform chromitites of the Luobusa ophiolite, southern Tibet
Title | The PGE and base-metal alloys in the podiform chromitites of the Luobusa ophiolite, southern Tibet |
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Authors | |
Keywords | Base-metal alloys Chromitites Luobusa Ophiolite PGE minerals Tibet |
Issue Date | 2000 |
Publisher | Mineralogical 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? |
Abstract | PGE 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 Identifier | http://hdl.handle.net/10722/151033 |
ISSN | 2023 Impact Factor: 1.1 2023 SCImago Journal Rankings: 0.470 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Bai, W | en_HK |
dc.contributor.author | Robinson, PT | en_HK |
dc.contributor.author | Fang, Q | en_HK |
dc.contributor.author | Yang, J | en_HK |
dc.contributor.author | Yan, B | en_HK |
dc.contributor.author | Zhang, Z | en_HK |
dc.contributor.author | Hu, XF | en_HK |
dc.contributor.author | Zhou, MF | en_HK |
dc.contributor.author | Malpas, J | en_HK |
dc.date.accessioned | 2012-06-26T06:16:16Z | - |
dc.date.available | 2012-06-26T06:16:16Z | - |
dc.date.issued | 2000 | en_HK |
dc.identifier.citation | Canadian Mineralogist, 2000, v. 38 n. 3, p. 585-598 | en_HK |
dc.identifier.issn | 0008-4476 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/151033 | - |
dc.description.abstract | PGE 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.language | eng | en_US |
dc.publisher | Mineralogical Association of Canada. The Journal's web site is located at http://www.mineralogicalassociation.ca/template/EJournal/ | en_HK |
dc.relation.ispartof | Canadian Mineralogist | en_HK |
dc.subject | Base-metal alloys | en_HK |
dc.subject | Chromitites | en_HK |
dc.subject | Luobusa | en_HK |
dc.subject | Ophiolite | en_HK |
dc.subject | PGE minerals | en_HK |
dc.subject | Tibet | en_HK |
dc.title | The PGE and base-metal alloys in the podiform chromitites of the Luobusa ophiolite, southern Tibet | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Zhou, MF: mfzhou@hkucc.hku.hk | en_HK |
dc.identifier.email | Malpas, J: jgmalpas@hku.hk | en_HK |
dc.identifier.authority | Zhou, MF=rp00844 | en_HK |
dc.identifier.authority | Malpas, J=rp00059 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.scopus | eid_2-s2.0-0033828697 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0033828697&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 38 | en_HK |
dc.identifier.issue | 3 | en_HK |
dc.identifier.spage | 585 | en_HK |
dc.identifier.epage | 598 | en_HK |
dc.identifier.isi | WOS:000088845500003 | - |
dc.publisher.place | Canada | en_HK |
dc.identifier.scopusauthorid | Bai, W=9271474700 | en_HK |
dc.identifier.scopusauthorid | Robinson, PT=7403720506 | en_HK |
dc.identifier.scopusauthorid | Fang, Q=7202644200 | en_HK |
dc.identifier.scopusauthorid | Yang, J=8871818900 | en_HK |
dc.identifier.scopusauthorid | Yan, B=7201858637 | en_HK |
dc.identifier.scopusauthorid | Zhang, Z=8966332300 | en_HK |
dc.identifier.scopusauthorid | Hu, XF=7404710867 | en_HK |
dc.identifier.scopusauthorid | Zhou, MF=7403506005 | en_HK |
dc.identifier.scopusauthorid | Malpas, J=7006136845 | en_HK |
dc.identifier.issnl | 0008-4476 | - |