Noble metals segregation and fractionation in magmatic ores from Ronda and Beni Bousera Lherzolite Massifs (Spain, Morocco)
Identifieur interne : 001225 ( Main/Exploration ); précédent : 001224; suivant : 001226Noble metals segregation and fractionation in magmatic ores from Ronda and Beni Bousera Lherzolite Massifs (Spain, Morocco)
Auteurs : M. Leblanc [France] ; F. Gervilla [Espagne] ; J. Jedwab [Belgique]Source :
- Mineralogy and Petrology [ 0930-0708 ] ; 1990-05-01.
Descripteurs français
- Pascal (Inist)
- Wicri :
English descriptors
- KwdEn :
Abstract
Summary: Three types of mineralization are found in high-temperature lherzolite massifs of Southern Spain and Northern Morocco: (Cr) chromite, (Cr-Ni) chromite-nickel arsenide, (S-G) sulphide-graphite. The ore veins are distributed in this order from the plagioclase-lherzolite core to the garnet-lherzolite border of the massifs. These hightemperature ore assemblages (1200-600°C) have cumulate textures including orthopyroxene and/or cordierite as main silicate minerals. High average PGE concentrations are present in the Cr-Ni ores (2000 ppb) in relation to the Ni-arsenide abundance. The Cr ores have only 900 ppb PGE, and the S-G ores are PGE-poor (350 ppb). Gold roughly follows the PGE distribution: 13,000 ppb in Cr-Ni ores, 570 ppb in Cr ores, and only 88 ppb in S-G ores. The chondrite normalized PGE patterns of the Cr-Ni ores are chondritic, whereas those of the Cr and S-G ores have respectively negative and positive slopes. The Pd/Ir ratio strongly increases from the Cr ores (0.39) to the Cr-Ni and the S-G ores (2.7 and 3.4)). There are some (Os, Ru)S2 inclusions in the chromite of the Cr ores. In the Cr-Ni ores, some minute Au, Au-Cu, and Au-Bi-Te grains are observed. No PGM have been found, except in a weathered Cr-Ni ore sample where abundant PGM (PtAs2, IrAsS) are present., suggesting that PGE may be hidden as solid solution in the Ni-arsenide. The ore-forming magma probably has a mantle source-rock. The earliest chromites (Cr ores) contain Os-Ir-Ru mineral inclusions, whereas most of the gold and the remaining PGE with higher Pd/Ir ratio were partitioned into an immiscible As-S-liquid, which fractionated later into an earliest PGE-Au-rich NiAs-phase (Cr-Ni ores) and then a PGE-Au-poor MSS-phase (S-G ores).
Url:
DOI: 10.1007/BF01162693
Affiliations:
- Belgique, Espagne, France
- Andalousie, Languedoc-Roussillon, Occitanie (région administrative), Région de Bruxelles-Capitale
- Bruxelles, Grenade (Espagne), Montpellier
- Université Montpellier 2, Université de Grenade, Université libre de Bruxelles
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Le document en format XML
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The ore veins are distributed in this order from the plagioclase-lherzolite core to the garnet-lherzolite border of the massifs. These hightemperature ore assemblages (1200-600°C) have cumulate textures including orthopyroxene and/or cordierite as main silicate minerals. High average PGE concentrations are present in the Cr-Ni ores (2000 ppb) in relation to the Ni-arsenide abundance. The Cr ores have only 900 ppb PGE, and the S-G ores are PGE-poor (350 ppb). Gold roughly follows the PGE distribution: 13,000 ppb in Cr-Ni ores, 570 ppb in Cr ores, and only 88 ppb in S-G ores. The chondrite normalized PGE patterns of the Cr-Ni ores are chondritic, whereas those of the Cr and S-G ores have respectively negative and positive slopes. The Pd/Ir ratio strongly increases from the Cr ores (0.39) to the Cr-Ni and the S-G ores (2.7 and 3.4)). There are some (Os, Ru)S2 inclusions in the chromite of the Cr ores. In the Cr-Ni ores, some minute Au, Au-Cu, and Au-Bi-Te grains are observed. No PGM have been found, except in a weathered Cr-Ni ore sample where abundant PGM (PtAs2, IrAsS) are present., suggesting that PGE may be hidden as solid solution in the Ni-arsenide. The ore-forming magma probably has a mantle source-rock. The earliest chromites (Cr ores) contain Os-Ir-Ru mineral inclusions, whereas most of the gold and the remaining PGE with higher Pd/Ir ratio were partitioned into an immiscible As-S-liquid, which fractionated later into an earliest PGE-Au-rich NiAs-phase (Cr-Ni ores) and then a PGE-Au-poor MSS-phase (S-G ores).</div></front></TEI><affiliations><list><country><li>Belgique</li><li>Espagne</li><li>France</li></country><region><li>Andalousie</li><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li><li>Région de Bruxelles-Capitale</li></region><settlement><li>Bruxelles</li><li>Grenade (Espagne)</li><li>Montpellier</li></settlement><orgName><li>Université Montpellier 2</li><li>Université de Grenade</li><li>Université libre de Bruxelles</li></orgName></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Leblanc, M" sort="Leblanc, M" uniqKey="Leblanc M" first="M." last="Leblanc">M. Leblanc</name></region></country><country name="Espagne"><region name="Andalousie"><name sortKey="Gervilla, F" sort="Gervilla, F" uniqKey="Gervilla F" first="F." last="Gervilla">F. Gervilla</name></region></country><country name="Belgique"><region name="Région de Bruxelles-Capitale"><name sortKey="Jedwab, J" sort="Jedwab, J" uniqKey="Jedwab J" first="J." last="Jedwab">J. Jedwab</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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