Journal ArticleDOI
Platinum metals magmatic sulfide ores.
A. J. Naldrett,J. M. Duke +1 more
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The absolute and relative concentrations of PGE in magmatic sulfides are explained in terms of the degree of partial melting of mantle peridotite required to produce the parent magma and the processes of batch equilibration and fractional segregation of sulfides.Abstract:
Platinum-group elements (PGE) are mined predominantly from deposits that have formed by the segregation of molten iron-nickel-copper sulfides from silicate magmas. The absolute concentrations of PGE in sulfides from different deposits vary over a range of five orders of magnitude, whereas those of other chalcophile elements vary by factors of only 2 to 100. However, the relative proportions of the different PGE in a given deposit are systematically related to the nature of the parent magma. The absolute and relative concentrations of PGE in magmatic sulfides are explained in terms of the degree of partial melting of mantle peridotite required to produce the parent magma and the processes of batch equilibration and fractional segregation of sulfides. The Republic of South Africa and the U.S.S.R. together possess more than 97 percent of the world PGE reserves, but significant undeveloped resources occur in North America. The Stillwater complex in Montana is perhaps the most important example.read more
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THE Re-Os ISOTOPE SYSTEM IN COSMOCHEMISTRY AND HIGH-TEMPERATURE GEOCHEMISTRY
TL;DR: The Re-Os isotope sytem, based on the long-lived β− transition of 187Re to 187Os, has matured to wide use in cosmochemistry and high-temperature geochemistry as discussed by the authors.
Journal ArticleDOI
The origin of the fractionation of platinum-group elements in terrestrial magmas
TL;DR: The platinum-group elements (PGE's) when chondrite normalized, have been found to be fractionated in order of descending melting point (Os, Ir, Ru, Rh, Pt, Pd and Au) as mentioned in this paper.
Journal ArticleDOI
Podiform Chromitites in the Luobusa Ophiolite (Southern Tibet): Implications for Melt-Rock Interaction and Chromite Segregation in the Upper Mantle
TL;DR: The largest known chromite deposit in China is the Luobusa ophiolite in the Indus-ladling Zjingbo suture of southern Tibet as discussed by the authors, which consists of a large number of podiform chromitites.
Journal ArticleDOI
Abundance and distribution of gold, palladium and iridium in some spinel and garnet lherzolites: implications for the nature and origin of precious metal-rich intergranular components in the upper mantle
Roger H. Mitchell,Reid R. Keays +1 more
TL;DR: The abundance and distribution of Au, Pd, Ir, Cu, Co and Cr has been determined in mantle-derived spinel lherzolite xenoliths in basanites from Mt Porndon (Victoria, Australia) and Kilbourne Hole (New Mexico, U.S.A.) and in garnet lhersolites from the Matsoku and Thaba Putsoa kimberlites (Lesotho) as discussed by the authors.
References
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Journal ArticleDOI
Solubility of Sulfur in Mafic Magmas
TL;DR: In this article, it was shown that a temperature increase of 100 degrees C magnifies the capacity of a mafic magma to dissolve sulfur by a factor of 5 to 7 times, assuming a constant ratio of O2 to S2.
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The influence of silicate:sulfide ratios on the geochemistry of magmatic sulfides
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Komatiitic and Iron-rich Tholeiitic Lavas of Munro Township, Northeast Ontario
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Crystallization sequences in the Muskox intrusion and other layered intrusions - II. Origin of chromitite layers and similar deposits of other magmatic ores
TL;DR: In this paper, a mechanism of origin for chromite-rich layers in stratiform ultramafic-gabbroic intrusions is proposed whereby the layers are precipitated on occasions when the basic parental magma of the intrusion is suddenly extensively contaminated with granitic liquid melted from salic roof rocks.
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Increased dopamine receptor sensitivity after estrogen treatment using the rat rotation model
TL;DR: Both behavioral and biochemical evidence suggests that striatal dopamine function is influenced by peripherally administered estrogens, relevant to the clinical cases of chorea associated with elevated concentrations of estrogen, which occur in pregnancy and during oral contraceptive use.
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