By Roger Powell

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WE 2(f)) The Gi-x loops for phases A and B will be continuous if the phases have the same structure (figures 2. 18(a)-(c)). The result of decreasing the curvature of the G-x loops for the two phases will be to stabilize a complete solution between the two phases, denoted by At (figure © Roger Powell 40 Equilibrium Thermodynamics in Petrology the reaction coefficient of one phase in the reaction before we can calculate the other reaction coefficients. Solving the set of equations is simplified if the chosen reaction coefficient is for a phase which occurs in several equations.

If we are considering a rare-earth element, say lanthanum, La, in a pyroxene, it is not possible to make a pure La pyroxene, so that G IA cannot be determined directly. Similarly, if we are considering NaCI species in an aqueous solution, we cannot make pure NaCI in the water structure. 3. Here, ILIA can be measured for small values of XIA (large negative values of In XIA), but we 1. ,:";: -, -= i-. 3 A plot of ILIA against In X 1A illustrating standard state 2. know nothing about it as X IA-l> 1 (the chain line).

Are usually plotted in terms of mole proportions or weight proportions. e. mole fractions) unless otherwise stated. First the analysis must be converted into a more useful form. The mole proportions of the oxides in the rock are obtained by dividing each of the weight % values by the appropriate molecular weight (MW), then summing to find the factor which, when divided into each value, gives the mole proportion. Thus: Oxide wt% wt%/MW Mole proportion MgO Si02 45·06 54·94 1·1176 0·9143 1·1176/2·0319 0·55 0·9143/2·0319 = 0·45 --- 2·0319 One way of calculating the proportion of olivine (01) and orthopyroxene (opx) in this rock is as follows.