Titlebook: Geo-Platinum 87; H. M. Prichard,P. J. Potts,S. J. Cribb Book 1988 Elsevier Science Publishers Ltd 1988 Mafic.chemistry.dyke.geochemistry.g

Strength

The Potential of Fire-assay and ICP-MS for the Determination of Platinum-Group Elements in Geologicaed, mineral species, and their very high financial value. These factors have resulted in the need for an analytical method offering . of a . allied with an . technique. For many years these criteria were satisfied by fusion of large sample aliquots followed by gravimetric measurement of the various

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扩张

丧失

Solubility and Transport of Platinum-Group Elements in Hydrothermal Solutions: Thermodynamic and Phygical fluids such as chloride, hydroxide, bisulphide, polysulphide, thiosulphate or ammonia complexes, depending on pH, fO., temperature and lignad concentration..In saline fluids (i. e. ΣCl. > 1·0 m) at 25°C, Pt and Pd are soluble as . and ., at a level of 10 ppb or greater, only in very acidic and

忧伤

New Mechanisms for the Mobilization of the Platinum-Group Elements in the Supergene Zonesolution is necessary for mobilization and differentiation in oxide zones. Previous suggestions concerning this complex chemistry involving chloride ion are applicable only in very unusual circumstances. It is clear that the natural ligand set available for complex formation is severely restricted.

Adornment

Spinel Non-stoichiometry as the Explanation for Ni-, Cu- and PGE-enriched Sulphides in Chromititesin the difference between the PGE concentrations in chromitite-hosted and Merensky-type PGE ores and the concentrations in magmatic sulphides that are less enriched in PGE. The very high concentrations of Ni and Cu also characteristic of chromititehosted sulphides are not explicable in this way. Thi

NUDGE

The Potential for Hydrothermal Platinum Deposits similar to that of gold, the ratio of p1atinum:gold recovered by mining operations is about 1:20. The shortfall is in platinum recovered from mineral deposits in which the ore components have been transported in aqueous solutions at temperatures below 400°C.

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偏见

Noble Metal Geochemistry of some Ni-Cu Deposits in the Sveconorwegian and Caledonian Orogens in Norw far the richest deposits are: Fæøy averaging 1790 ppb Pt and 4760 ppb Pd, and Lillefiellklumpen averaging 1800 ppb Pt and 3070 ppb Pd. Both are small massive sulphide bodies, the former associated with late stage dykes within the Karmøy ophiolite while the latter is associated with MORB-type tholei

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