Partitioning of palladium, iridium, platinum, and gold between sulfide liquid and basalt melt at 1,200 degree C

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(90)90061-O· OSTI ID:6207070

Stone, W E; Crocket, J H ^[1]; Fleet, M E ^[2]

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1. McMaster Univ., Hamilton, Ontario (Canada)
2. Univ. of Western Ontario, London (Canada)

Iron-nickel monosulfide and basalt glass containing trace amounts of PGE equilibrated at 1,200{degree}C, and f{sub o{sub 2}} = 10{sup {minus}9.2} (close to the wustite-magnetite buffer) and f{sub s{sub 2}} = 10{sup {minus}0.9}, have been analyzed for noble metals by radiochemical and instrumental neutron activation analysis. The average contents of PGE in coexisting Fe-Ni sulfide and basalt glass, respectively, are Pd, 50 ppm and 0.5 ppb; Ir, 50 ppm and 0.5 ppb; Pt, 100 ppm and 10 ppb; and Au, 0.7 ppm and 0.8 ppb. The sulfide liquid-silicate melt partition coefficients (D values) for the noble metals are (9 {plus minus} 7) {times} 10{sup 4} for Pd, (1 {plus minus} 0.7) {times} 10{sup 5} for Ir, (9 {plus minus} 6) {times} 10{sup 3} Pt, and (1 {plus minus} 0.9) {times} 10{sup 3} for Au. The noble metals are strongly partitioned into sulfide liquid, but the affinity of Pd and Ir for sulfide liquid is about 50 times greater than that of Pt and about 500 times greater than that of Au. The D values indicate that equilibrium partitioning between immiscible sulfide liquid and basalt magma would result in fractionation of the noble metals, which differs significantly from that generally observed in nature.

• OSTI ID: 6207070
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Vol. 54:8; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
BASALT
PETROGENESIS
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTHS
SULFIDE MINERALS
CHEMICAL COMPOSITION
CONCENTRATION RATIO
FRACTIONATION
GEOCHEMISTRY
GOLD
IRIDIUM
MAGMATISM
NEUTRON ACTIVATION ANALYSIS
PALLADIUM
PLATINUM
RADIOCHEMICAL ANALYSIS
RADIOCHEMISTRY
ACTIVATION ANALYSIS
CHEMICAL ANALYSIS
CHEMISTRY
ELEMENTS
IGNEOUS ROCKS
METALS
MINERALS
PLATINUM METALS
ROCKS
SEPARATION PROCESSES
TRANSITION ELEMENTS
VOLCANIC ROCKS
580000* - Geosciences