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Grandite garnet and/or chnopyroxene of diopside-hedenbergite series are the most important minerals which characterize the skarn-type ore deposits. They frequently contain a considerable amount of iron. Besides them, the ore deposits of this type are usually composed of calcite, magnetite and quartz with sulfides and oxides as ore minerals. For this reason, the phase rela tions among calcite, andradite, hedenbergite, magnetite and quartz should indicate the favorable conditions of formation of ore bearing skarn. In this paper, the writer tries to estimate quantitatively the phase relations in the system CaO-FeOB SiO2 under the fluids composed of water and carbon dioxide, on the basis of previous studies of the system CaO-SiO2-CO2 and CaO-FeOR SiO2-O2. Compositions of phases considered in this paper are shown on a CaO-FeOx-SiO2 plot regardless CO, (Fig. 1), and listed in Table 1 with their abbreviations and molar volumes calculated from the data complied by Strunz (1970) and Yamanaka et al. (1977).

Phase relations in the system CaO-FeOx-SiO2 in H2O-CO2 mixtures.