Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2515c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 9, pp.2515-2525
Physics
3
Scientific paper
Thermochemical data on Fe-Mg olivine, orthopyroxene, spinel and Ca-Fe-Mg garnet have been tested and reevaluated in reproducing experimental equilibrium data. All data (except of spinel) adjusted in this process lie within the error limits of original calorimetric experiments. For spinel, an enthalpy of -2307.2 kJ/mol and an entropy of 81.5 J/mol-K has been recommended. Recommended interaction parameters for the spinel-hercynite and forsterite-fayalite solutions are as follows: Spinel: W spinel-hercynite = 9124.0 J/mol. W hercynite-spinel = 0.0 J/mol Olivine: W = 4500.0 J/mol for 1 cation. Excess entropies (on 1 cation basis) necessary to reproduce phase equilibria for the pyrope-almandine and almandine-grossular solutions are as follows: Mg-Fegarnet: W s pyrope-almandine = 11.760 - 0.00167 J/mol-K. W s almandine-pyrope = -10.146 +0.0037 T J/mol-K. Fe-Ca garnet: W s = -16.07 + 0.0126 T J/mol-K.
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