Magmatic Sulfide Deposits: Geology, Geochemistry and by Anthony J. Naldrett

By Anthony J. Naldrett

This booklet is written by a number one authority just about magmatic sulfide deposits. an summary of deposit kinds, followed through a precis of the assets of nickel, copper and platinum-group parts within the world's imperative recognized deposits, is via a precis of the correct actual chemistry. The center of the publication includes a dialogue concerning the geology and geochemistry of every of the deposit forms in turn, accompanied through the implications of this knowledge to the starting place of the deposits within the mild of our figuring out of the chemical strategies concerned. a last bankruptcy makes a speciality of using the genetic recommendations in exploration.

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FS 2. Variations in_/02 can affect NFeo by changing the Fe3+/Fe 2+ ratio of the magma, but so long as the value of_/02 remains below about 10-8 atm (cf. Fudali 1965), the effect on the Fe3+/Fe2+ ratio of basaltic magmas is small. Doyle and Naldrett (1986) emphasize that variations in _/0 2 also affect the oxygen content of sulfide-oxide 1iquids, and hence activity-composition re1ationships within them. g. K0 Ni-Fe, Kn Co-Fe, KnCu-Fe) which expresses the observed partitioning of chalcophile elements between sulfide and silicate melts.

5000 ppm) as the consequence of the amount of silicate magma that a given mass of sulfide (R value) has achieved effective equilibrium with. High ratios of silicate magma to sulfide will lead to high PGE tenors (see for example Campbell and Naldrett 1979; Campbell et al. 1983; Naldrett et al. 1987). Explanations of this type require the partition coefficients of the noble metals to be two orders of magnitude greater than those of Cu and Ni, that is about 104 -10 5 . This hypothesis has been part of the stimulus for several attempts to determine partition coefficients experimentally.

The concentration ofthe incompatible element Zr is used as an index of magma crystallization 30 2 Theoretical considerations Initially crystallization is marked by a sharp fall in sulfur solubility, because of the steep decrease in temperature and the sensitivity of sulfur solubility to temperature. Once plagioclase appears on the liquidus, the decrease in temperature for amount of magma crystallized is significantly lower than during the crystallization of olivine and/or pyroxene, the Feü content of the residual magma increases slightly, so that the slope of the sulfur saturation curve is much shallower.

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