Partitioning of platinum-group elements in the Fe-Ni-S system and their fractionation in nature
The partitioning of minor amounts of platinum-group elements (PGEs: Ru, Rh, Pd, Os, Ir, and Pt) has been investigated in the Fe-Ni-S system at 1000 to 1400°C and low pressure. Revising previous experimental results indicating lack of specificity of PGE, distinctly different partitioning behavior is...
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| Veröffentlicht in: | Geochimica et cosmochimica acta 1991, Vol.55 (1), p.245-253 |
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| creator | Fleet, M.E. Stone, W.E. |
| description | The partitioning of minor amounts of platinum-group elements (PGEs: Ru, Rh, Pd, Os, Ir, and Pt) has been investigated in the Fe-Ni-S system at 1000 to 1400°C and low pressure. Revising previous experimental results indicating lack of specificity of PGE, distinctly different partitioning behavior is demonstrated for heavy and light platinoids; Os, Ir, and Pt are preferentially concentrated in alloy phases, whereas Pd is depleted in alloys and relatively enriched in sulfide liquid. Partition coefficients for Fe alloy/sulfide liquid at 1000°C are 1 to 2 for Pd (comparable to values for Ni), 30 to 110 for Rh, and in excess of 1000 for Os, Ir, and Pt. Ruthenium and, to a lesser extent, rhodium are the only PGEs with significant solubility in troilite coexisting with sulfide liquid. The marked fractionation of Pt from Pd in the presence of coexisting alloy and sulfide liquid is contrasted with the minimal fractionation of PGEs in the primary differentiation of planetary material and of Pt from Pd in the generation of basic magmas in the upper mantle. The characteristic fractionation patterns for PGEs in upper mantle and crustal rocks are most likely related to the presence of a combination of host phases (alloys, spinel, diopside) for the refractory PGEs (Os, Ir, and Ru) during partial melting in the upper mantle. |
| doi_str_mv | 10.1016/0016-7037(91)90415-2 |
| format | Article |
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Revising previous experimental results indicating lack of specificity of PGE, distinctly different partitioning behavior is demonstrated for heavy and light platinoids; Os, Ir, and Pt are preferentially concentrated in alloy phases, whereas Pd is depleted in alloys and relatively enriched in sulfide liquid. Partition coefficients for Fe alloy/sulfide liquid at 1000°C are 1 to 2 for Pd (comparable to values for Ni), 30 to 110 for Rh, and in excess of 1000 for Os, Ir, and Pt. Ruthenium and, to a lesser extent, rhodium are the only PGEs with significant solubility in troilite coexisting with sulfide liquid. The marked fractionation of Pt from Pd in the presence of coexisting alloy and sulfide liquid is contrasted with the minimal fractionation of PGEs in the primary differentiation of planetary material and of Pt from Pd in the generation of basic magmas in the upper mantle. 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Revising previous experimental results indicating lack of specificity of PGE, distinctly different partitioning behavior is demonstrated for heavy and light platinoids; Os, Ir, and Pt are preferentially concentrated in alloy phases, whereas Pd is depleted in alloys and relatively enriched in sulfide liquid. Partition coefficients for Fe alloy/sulfide liquid at 1000°C are 1 to 2 for Pd (comparable to values for Ni), 30 to 110 for Rh, and in excess of 1000 for Os, Ir, and Pt. Ruthenium and, to a lesser extent, rhodium are the only PGEs with significant solubility in troilite coexisting with sulfide liquid. The marked fractionation of Pt from Pd in the presence of coexisting alloy and sulfide liquid is contrasted with the minimal fractionation of PGEs in the primary differentiation of planetary material and of Pt from Pd in the generation of basic magmas in the upper mantle. The characteristic fractionation patterns for PGEs in upper mantle and crustal rocks are most likely related to the presence of a combination of host phases (alloys, spinel, diopside) for the refractory PGEs (Os, Ir, and Ru) during partial melting in the upper mantle.</description><subject>580000 - Geosciences</subject><subject>CHALCOGENIDES</subject><subject>CHEMICAL COMPOSITION</subject><subject>CHEMISTRY</subject><subject>CHONDRITES</subject><subject>COMPARATIVE EVALUATIONS</subject><subject>EARTH MANTLE</subject><subject>ELEMENTS</subject><subject>FRACTIONATION</subject><subject>GEOCHEMISTRY</subject><subject>GEOSCIENCES</subject><subject>IRON COMPOUNDS</subject><subject>IRON SULFIDES</subject><subject>MAGMA</subject><subject>MAGMATISM</subject><subject>METALS</subject><subject>METEORITES</subject><subject>MINERALS</subject><subject>PLATINUM METALS</subject><subject>PYRRHOTITE</subject><subject>SEPARATION PROCESSES</subject><subject>SOLUBILITY</subject><subject>STONE METEORITES</subject><subject>SULFIDE MINERALS</subject><subject>SULFIDES</subject><subject>SULFUR COMPOUNDS</subject><subject>TRANSITION ELEMENT COMPOUNDS</subject><subject>TRANSITION ELEMENTS</subject><subject>TROILITE</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1991</creationdate><recordtype>article</recordtype><recordid>eNp9kM1KAzEUhYMoWKtv4CK40kX0JjOZTDaCiFWhqKCuw5i500Y6mZKkQt_eiRWXbu4f53xwDyGnHC458OoKxsIUFOpc8wsNJZdM7JEJr5VgWhbFPpn8SQ7JUYyfAKCkhAkxL01ILrnBO7-gQ0fXqyY5v-nZIgybNcUV9uhTpM7TtEQ6Q_bk2CuN25iwp41v89kF2oXGZkyTS1aP0ybgMTnomlXEk98-Je-zu7fbBzZ_vn-8vZmzppBlYoUoRWlbgWJcreaVbjthQddWcCzKWta1qBSg4hqUglpx8WF5KTtUVaVtV0zJ2Y47xORMtC6hXdrBe7TJVCBHLIyicieyYYgxYGfWwfVN2BoOJidpckwmx2Q0Nz9JGjHarnc2HB_4chgyH73F1oWMbwf3P-Ab8wh5MQ</recordid><startdate>1991</startdate><enddate>1991</enddate><creator>Fleet, M.E.</creator><creator>Stone, W.E.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>1991</creationdate><title>Partitioning of platinum-group elements in the Fe-Ni-S system and their fractionation in nature</title><author>Fleet, M.E. ; Stone, W.E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a354t-32424cd2e2354c9169df2c098c21e3485882670e71907708712bc145fe7669cf3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1991</creationdate><topic>580000 - Geosciences</topic><topic>CHALCOGENIDES</topic><topic>CHEMICAL COMPOSITION</topic><topic>CHEMISTRY</topic><topic>CHONDRITES</topic><topic>COMPARATIVE EVALUATIONS</topic><topic>EARTH MANTLE</topic><topic>ELEMENTS</topic><topic>FRACTIONATION</topic><topic>GEOCHEMISTRY</topic><topic>GEOSCIENCES</topic><topic>IRON COMPOUNDS</topic><topic>IRON SULFIDES</topic><topic>MAGMA</topic><topic>MAGMATISM</topic><topic>METALS</topic><topic>METEORITES</topic><topic>MINERALS</topic><topic>PLATINUM METALS</topic><topic>PYRRHOTITE</topic><topic>SEPARATION PROCESSES</topic><topic>SOLUBILITY</topic><topic>STONE METEORITES</topic><topic>SULFIDE MINERALS</topic><topic>SULFIDES</topic><topic>SULFUR COMPOUNDS</topic><topic>TRANSITION ELEMENT COMPOUNDS</topic><topic>TRANSITION ELEMENTS</topic><topic>TROILITE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fleet, M.E.</creatorcontrib><creatorcontrib>Stone, W.E.</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Geochimica et cosmochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fleet, M.E.</au><au>Stone, W.E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Partitioning of platinum-group elements in the Fe-Ni-S system and their fractionation in nature</atitle><jtitle>Geochimica et cosmochimica acta</jtitle><date>1991</date><risdate>1991</risdate><volume>55</volume><issue>1</issue><spage>245</spage><epage>253</epage><pages>245-253</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>The partitioning of minor amounts of platinum-group elements (PGEs: Ru, Rh, Pd, Os, Ir, and Pt) has been investigated in the Fe-Ni-S system at 1000 to 1400°C and low pressure. Revising previous experimental results indicating lack of specificity of PGE, distinctly different partitioning behavior is demonstrated for heavy and light platinoids; Os, Ir, and Pt are preferentially concentrated in alloy phases, whereas Pd is depleted in alloys and relatively enriched in sulfide liquid. Partition coefficients for Fe alloy/sulfide liquid at 1000°C are 1 to 2 for Pd (comparable to values for Ni), 30 to 110 for Rh, and in excess of 1000 for Os, Ir, and Pt. Ruthenium and, to a lesser extent, rhodium are the only PGEs with significant solubility in troilite coexisting with sulfide liquid. The marked fractionation of Pt from Pd in the presence of coexisting alloy and sulfide liquid is contrasted with the minimal fractionation of PGEs in the primary differentiation of planetary material and of Pt from Pd in the generation of basic magmas in the upper mantle. The characteristic fractionation patterns for PGEs in upper mantle and crustal rocks are most likely related to the presence of a combination of host phases (alloys, spinel, diopside) for the refractory PGEs (Os, Ir, and Ru) during partial melting in the upper mantle.</abstract><cop>United States</cop><pub>Elsevier Ltd</pub><doi>10.1016/0016-7037(91)90415-2</doi><tpages>9</tpages></addata></record> |
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| ispartof | Geochimica et cosmochimica acta, 1991, Vol.55 (1), p.245-253 |
| issn | 0016-7037 1872-9533 |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | 580000 - Geosciences CHALCOGENIDES CHEMICAL COMPOSITION CHEMISTRY CHONDRITES COMPARATIVE EVALUATIONS EARTH MANTLE ELEMENTS FRACTIONATION GEOCHEMISTRY GEOSCIENCES IRON COMPOUNDS IRON SULFIDES MAGMA MAGMATISM METALS METEORITES MINERALS PLATINUM METALS PYRRHOTITE SEPARATION PROCESSES SOLUBILITY STONE METEORITES SULFIDE MINERALS SULFIDES SULFUR COMPOUNDS TRANSITION ELEMENT COMPOUNDS TRANSITION ELEMENTS TROILITE |
| title | Partitioning of platinum-group elements in the Fe-Ni-S system and their fractionation in nature |
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