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- W1620705166 abstract "The magma mixing model for the genesis of PGE reefs in large layered intrusions has recently been criticized due to (1) uncertainty of the proposed concave-upward sulfur solubility curve, (2) lack of compelling evidence for sulfide saturation before and after the deposition of the reefs, and (3) mass balance problem for the concentrations of PGE in the reefs. Thermodynamic calculations indicate that the concave-upward curve of S solubility, though different in detail from the original, is very much in evidence. The calculations also indicate that the content of S dissolved in the residual magma may fall below the S solubility curve when the rate of S increase in the magma due to the removal of silicate cumulates is less than the rate of increase in its S solubility due to the change in its temperature and composition during fractional crystallization. Mixing of such fractionated and yet sulfide unsaturated magma with appropriate amounts of a primitive magma is still capable of achieving sulfide saturation in the hybrid. Once the immiscible sulfides settle out of the magma, the content of S dissolved in the hybrid may fall below its solubility curve once again during further crystallization. Thus the mixing model does not require the footwall and hangingwall of the reefs to contain cumulus sulfides. Small quantities of sulfide droplets formed during fractional crystallization may remain suspended in magma until next replenishment, and in this case they can be re-dissolved in the hybrid when the proportion of a new input is large enough. Such process would have minimized, if not eliminated, the mass balance problem." @default.
- W1620705166 created "2016-06-24" @default.
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- W1620705166 date "2001-05-01" @default.
- W1620705166 modified "2023-09-24" @default.
- W1620705166 title "Magma mixing, sulfide saturation and PGE mineralization in dynamic magma chambers: A thermodynamic assessment" @default.
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