Platinum-group element abundances in the upper mantle: new constraints from in situ and whole-rock analyses of Massif Central xenoliths (France)
Identifieur interne : 002764 ( Istex/Curation ); précédent : 002763; suivant : 002765Platinum-group element abundances in the upper mantle: new constraints from in situ and whole-rock analyses of Massif Central xenoliths (France)
Auteurs : Jean-Pierre Lorand [France] ; Olivier Alard [Australie]Source :
- Geochimica et Cosmochimica Acta [ 0016-7037 ] ; 2001.
Descripteurs français
- Wicri :
- topic : Essence.
English descriptors
- KwdEn :
- Ablation, Abyssal peridotites, Acta, Alard, Anomaly, Ballhaus, Base metal, Bennett, Carbonaceous chondrites, Celessou, Celessou lherzolites, Celessou samples, Chondrite, Chondritic, Chondritic meteorites, Chondritic ratios, Conquere, Core formation, Cosmochim, Earth planet, Equilibration, Error bars, External reproducibility, Fertile lherzolites, Geochim, Harzburgites, Iherzolite, Incompatible, Incompatible trace elements, Laser, Laser ablation, Lenoir, Lett, Lherzolites, Lithospheric, Lithospheric mantle, Lorand, Lree, Mackovicky, Macquarie university, Mantle xenoliths, Massif, Mbrx, Mbs1, Mbs1 mbs3, Mbs3, Mcdonough, Meisel, Merensky reef, Metasomatic, Metasomatic clinopyroxene, Metasomatism, Modal abundances, Montboissier, Montboissier samples, Montbriancon, Negative anomalies, Northern massif, Orogenic, Other hand, Partitioning, Partitioning behavior, Pentlandite, Peridotite, Peridotite xenoliths, Petrol, Plasma mass spectrometry, Poikiloblastic, Poikiloblastic peridotites, Poor reproducibility, Powder aliquots, Preferential partitioning, Primitive mantle, Protogranular, Protogranular xenoliths, Rehkamper, Relative abundances, Reproducibility, Sample mbs1, Siderophile, Siderophile elements, Silicate, Solid solution, Solubility, Solubility limits, Spinel, Spinel peridotite xenoliths, Subcontinental lithospheric mantle, Sylvester, Symbol size, Thin section, Trace element patterns, Upper mantle, Whole rock, Xenolith.
- Teeft :
- Ablation, Abyssal peridotites, Acta, Alard, Anomaly, Ballhaus, Base metal, Bennett, Carbonaceous chondrites, Celessou, Celessou lherzolites, Celessou samples, Chondrite, Chondritic, Chondritic meteorites, Chondritic ratios, Conquere, Core formation, Cosmochim, Earth planet, Equilibration, Error bars, External reproducibility, Fertile lherzolites, Geochim, Harzburgites, Iherzolite, Incompatible, Incompatible trace elements, Laser, Laser ablation, Lenoir, Lett, Lherzolites, Lithospheric, Lithospheric mantle, Lorand, Lree, Mackovicky, Macquarie university, Mantle xenoliths, Massif, Mbrx, Mbs1, Mbs1 mbs3, Mbs3, Mcdonough, Meisel, Merensky reef, Metasomatic, Metasomatic clinopyroxene, Metasomatism, Modal abundances, Montboissier, Montboissier samples, Montbriancon, Negative anomalies, Northern massif, Orogenic, Other hand, Partitioning, Partitioning behavior, Pentlandite, Peridotite, Peridotite xenoliths, Petrol, Plasma mass spectrometry, Poikiloblastic, Poikiloblastic peridotites, Poor reproducibility, Powder aliquots, Preferential partitioning, Primitive mantle, Protogranular, Protogranular xenoliths, Rehkamper, Relative abundances, Reproducibility, Sample mbs1, Siderophile, Siderophile elements, Silicate, Solid solution, Solubility, Solubility limits, Spinel, Spinel peridotite xenoliths, Subcontinental lithospheric mantle, Sylvester, Symbol size, Thin section, Trace element patterns, Upper mantle, Whole rock, Xenolith.
Abstract
Abstract: Fourteen peridotite xenoliths collected in the Massif Central neogene volcanic province (France) have been analyzed for platinum-group elements (PGE), Au, Cu, S, and Se. Their total PGE contents range between 3 and 30 ppb and their PGE relative abundances from 0.01 to 0.001 × CI-chondrites, respectively. Positive correlations between total PGE contents and Se suggest that all of the PGE are hosted mainly in base metal sulfides (monosulfide solid solution [Mss], pentlandite, and Cu-rich sulfides [chalcopyrite/isocubanite]). Laser ablation microprobe-inductively coupled plasma mass spectrometry analyses support this conclusion while suggesting that, as observed in experiments on the Cu-Fe-Ni-S system, the Mss preferentially accommodate refractory PGEs (Os, Ir, Ru, and Rh) and Cu-rich sulfides concentrate Pd and Au. Poikiloblastic peridotites pervasively percolated by large silicate melt fractions at high temperature (1200°C) display the lowest Se (<2.3 ppb) and the lowest PGE contents (0.001 × CI-chondrites). In these rocks, the total PGE budget inherited from the primitive mantle was reduced by 80%, probably because intergranular sulfides were completely removed by the silicate melt. In contrast, protogranular peridotites metasomatized by small fractions of volatile-rich melts are enriched in Pt, Pd, and Au and display suprachondritic Pd/Ir ratios (1.9). The palladium-group PGE (PPGE) enrichment is consistent with precipitation of Cu-Ni-rich sulfides from the metasomatic melts. In spite of strong light rare earth element (LREE) enrichments (Ce/YbN < 10), the three harzburgites analyzed still display chondrite-normalized PGE patterns typical of partial melting residues, i.e., depleted in Pd and Pt relative to Ir and Ru. Likewise, coarse-granular lherzolites, a common rock type in Massif Central xenoliths, display Pd/Ir, Ru/Ir, Rh/Ir, and Pt/Ir within the 15% uncertainty range of chondritic meteorites. These rocks do not contradict the late-veneer hypothesis that ascribes the PGE budget of the Earth to a late-accreting chondritic component; however, speculations about this component from the Pd/Ir and Pt/Ir ratios of basalt-borne xenoliths may be premature.
Url:
DOI: 10.1016/S0016-7037(01)00627-5
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<term>Abyssal peridotites</term>
<term>Acta</term>
<term>Alard</term>
<term>Anomaly</term>
<term>Ballhaus</term>
<term>Base metal</term>
<term>Bennett</term>
<term>Carbonaceous chondrites</term>
<term>Celessou</term>
<term>Celessou lherzolites</term>
<term>Celessou samples</term>
<term>Chondrite</term>
<term>Chondritic</term>
<term>Chondritic meteorites</term>
<term>Chondritic ratios</term>
<term>Conquere</term>
<term>Core formation</term>
<term>Cosmochim</term>
<term>Earth planet</term>
<term>Equilibration</term>
<term>Error bars</term>
<term>External reproducibility</term>
<term>Fertile lherzolites</term>
<term>Geochim</term>
<term>Harzburgites</term>
<term>Iherzolite</term>
<term>Incompatible</term>
<term>Incompatible trace elements</term>
<term>Laser</term>
<term>Laser ablation</term>
<term>Lenoir</term>
<term>Lett</term>
<term>Lherzolites</term>
<term>Lithospheric</term>
<term>Lithospheric mantle</term>
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<term>Macquarie university</term>
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<term>Mbs1 mbs3</term>
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<term>Mcdonough</term>
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<term>Merensky reef</term>
<term>Metasomatic</term>
<term>Metasomatic clinopyroxene</term>
<term>Metasomatism</term>
<term>Modal abundances</term>
<term>Montboissier</term>
<term>Montboissier samples</term>
<term>Montbriancon</term>
<term>Negative anomalies</term>
<term>Northern massif</term>
<term>Orogenic</term>
<term>Other hand</term>
<term>Partitioning</term>
<term>Partitioning behavior</term>
<term>Pentlandite</term>
<term>Peridotite</term>
<term>Peridotite xenoliths</term>
<term>Petrol</term>
<term>Plasma mass spectrometry</term>
<term>Poikiloblastic</term>
<term>Poikiloblastic peridotites</term>
<term>Poor reproducibility</term>
<term>Powder aliquots</term>
<term>Preferential partitioning</term>
<term>Primitive mantle</term>
<term>Protogranular</term>
<term>Protogranular xenoliths</term>
<term>Rehkamper</term>
<term>Relative abundances</term>
<term>Reproducibility</term>
<term>Sample mbs1</term>
<term>Siderophile</term>
<term>Siderophile elements</term>
<term>Silicate</term>
<term>Solid solution</term>
<term>Solubility</term>
<term>Solubility limits</term>
<term>Spinel</term>
<term>Spinel peridotite xenoliths</term>
<term>Subcontinental lithospheric mantle</term>
<term>Sylvester</term>
<term>Symbol size</term>
<term>Thin section</term>
<term>Trace element patterns</term>
<term>Upper mantle</term>
<term>Whole rock</term>
<term>Xenolith</term>
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<term>Abyssal peridotites</term>
<term>Acta</term>
<term>Alard</term>
<term>Anomaly</term>
<term>Ballhaus</term>
<term>Base metal</term>
<term>Bennett</term>
<term>Carbonaceous chondrites</term>
<term>Celessou</term>
<term>Celessou lherzolites</term>
<term>Celessou samples</term>
<term>Chondrite</term>
<term>Chondritic</term>
<term>Chondritic meteorites</term>
<term>Chondritic ratios</term>
<term>Conquere</term>
<term>Core formation</term>
<term>Cosmochim</term>
<term>Earth planet</term>
<term>Equilibration</term>
<term>Error bars</term>
<term>External reproducibility</term>
<term>Fertile lherzolites</term>
<term>Geochim</term>
<term>Harzburgites</term>
<term>Iherzolite</term>
<term>Incompatible</term>
<term>Incompatible trace elements</term>
<term>Laser</term>
<term>Laser ablation</term>
<term>Lenoir</term>
<term>Lett</term>
<term>Lherzolites</term>
<term>Lithospheric</term>
<term>Lithospheric mantle</term>
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<term>Lree</term>
<term>Mackovicky</term>
<term>Macquarie university</term>
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<term>Mbrx</term>
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<term>Mbs1 mbs3</term>
<term>Mbs3</term>
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<term>Meisel</term>
<term>Merensky reef</term>
<term>Metasomatic</term>
<term>Metasomatic clinopyroxene</term>
<term>Metasomatism</term>
<term>Modal abundances</term>
<term>Montboissier</term>
<term>Montboissier samples</term>
<term>Montbriancon</term>
<term>Negative anomalies</term>
<term>Northern massif</term>
<term>Orogenic</term>
<term>Other hand</term>
<term>Partitioning</term>
<term>Partitioning behavior</term>
<term>Pentlandite</term>
<term>Peridotite</term>
<term>Peridotite xenoliths</term>
<term>Petrol</term>
<term>Plasma mass spectrometry</term>
<term>Poikiloblastic</term>
<term>Poikiloblastic peridotites</term>
<term>Poor reproducibility</term>
<term>Powder aliquots</term>
<term>Preferential partitioning</term>
<term>Primitive mantle</term>
<term>Protogranular</term>
<term>Protogranular xenoliths</term>
<term>Rehkamper</term>
<term>Relative abundances</term>
<term>Reproducibility</term>
<term>Sample mbs1</term>
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<term>Siderophile elements</term>
<term>Silicate</term>
<term>Solid solution</term>
<term>Solubility</term>
<term>Solubility limits</term>
<term>Spinel</term>
<term>Spinel peridotite xenoliths</term>
<term>Subcontinental lithospheric mantle</term>
<term>Sylvester</term>
<term>Symbol size</term>
<term>Thin section</term>
<term>Trace element patterns</term>
<term>Upper mantle</term>
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<front><div type="abstract" xml:lang="en">Abstract: Fourteen peridotite xenoliths collected in the Massif Central neogene volcanic province (France) have been analyzed for platinum-group elements (PGE), Au, Cu, S, and Se. Their total PGE contents range between 3 and 30 ppb and their PGE relative abundances from 0.01 to 0.001 × CI-chondrites, respectively. Positive correlations between total PGE contents and Se suggest that all of the PGE are hosted mainly in base metal sulfides (monosulfide solid solution [Mss], pentlandite, and Cu-rich sulfides [chalcopyrite/isocubanite]). Laser ablation microprobe-inductively coupled plasma mass spectrometry analyses support this conclusion while suggesting that, as observed in experiments on the Cu-Fe-Ni-S system, the Mss preferentially accommodate refractory PGEs (Os, Ir, Ru, and Rh) and Cu-rich sulfides concentrate Pd and Au. Poikiloblastic peridotites pervasively percolated by large silicate melt fractions at high temperature (1200°C) display the lowest Se (<2.3 ppb) and the lowest PGE contents (0.001 × CI-chondrites). In these rocks, the total PGE budget inherited from the primitive mantle was reduced by 80%, probably because intergranular sulfides were completely removed by the silicate melt. In contrast, protogranular peridotites metasomatized by small fractions of volatile-rich melts are enriched in Pt, Pd, and Au and display suprachondritic Pd/Ir ratios (1.9). The palladium-group PGE (PPGE) enrichment is consistent with precipitation of Cu-Ni-rich sulfides from the metasomatic melts. In spite of strong light rare earth element (LREE) enrichments (Ce/YbN < 10), the three harzburgites analyzed still display chondrite-normalized PGE patterns typical of partial melting residues, i.e., depleted in Pd and Pt relative to Ir and Ru. Likewise, coarse-granular lherzolites, a common rock type in Massif Central xenoliths, display Pd/Ir, Ru/Ir, Rh/Ir, and Pt/Ir within the 15% uncertainty range of chondritic meteorites. These rocks do not contradict the late-veneer hypothesis that ascribes the PGE budget of the Earth to a late-accreting chondritic component; however, speculations about this component from the Pd/Ir and Pt/Ir ratios of basalt-borne xenoliths may be premature.</div>
</front>
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