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Abstract

In this chapter I shall discuss some of the practical details involved in the implementation of thermodynamic and mass transfer calculations which model the chemical effects of magmatic vapor evolution (Candela, 1986a, 1986b, 1986c; Candela and Holland, 1984, 1986; Tacker and Candela, 1987; Candela, in review; Bouton et al., 1987; and Candela, Liu, and Piccoli, in prep.) particularly as they relate to the development of ore fluids in porphyry-type, and skarn-type ore environments. Further, the implications of some of the recently published melt/vapor data will be explored, and some of my previously published models will be altered to accommodate this information.

Candela (1986a) presents four basic algorithms which can be used to calculate the concentration of selected elements in an evolving magmatic aqueous fluid, and the efficiency with which these elements can be removed from a pluton by vapor/melt partitioning upon the completion of crystallization. The input data for these mass transfer calculations include the initial concentration of the elements of interest in the melt, the water concentration (initial, saturation, or final) in the melt, the chlorine/water ratio, pressure, temperature, and the vapor/liquid and solid/liquid partition coefficients. In future models, the peraluminosity of the melt and the proportion of hydrous phases crystallizing from the magma will be considered. The four cases covered by these algorithms include:

In Candela (1986a), these four cases are referred to as Model I, {case I and case II}, and Model II, {case I and case II}, respectively. The vapor/melt partition coefficients are critical in

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