Petrogenesis of Metamorphic Rocks by Helmut G. F. Winkler (auth.)

By Helmut G. F. Winkler (auth.)

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These reactions liberate C02 but, since water is present in the pores before metamorphism, it is not permissible to regard temperature and pressure of C02 as the only factors of metamorphism. The pressure of the fluid phase present during metamorphism is equal to the sum of the partial pressures of C02 and H20. Besides the fluid pressure, the ratio of the two partial pressures, or the mole fraction of either C02 or H 20, has to be taken into account. Therefore, all reaction equilibria involving carbonates are bivariant.

5-4 km or more, dolomite and magnesite may be preserved in the K-feldspar-cordierite-hornfels facies. 5. The dissociation of dolomite can take place at appreciably lower temperatures only if Xco 2 of the fluid phase is very small (see TURNER, 1965), i. , if some mechanism has been effective locally in diluting the liberated CO 2 with H20. This situation will generally not exist. On the basis of discussions presented in connection with the formation of diopside and wollastonite, it must be assumed that, also in the case of reactions (13) and (14), Xco 2 of the fluid phase was not small, certainly not very small.

TUTTLE and R. J. HARKER: Amer. J. Sei. 255. 226-234 <1957L V. REVERDATTO: Geoehemistry International, 1038-1053 <1964>. L. S. WALTER: Amer. J. Sei. 261, L. 0. V. W. S. FYFE, F. J. TURNER, and J. VERHOOGEN: Geol. Soe. Amer. Mem. 73 <1958>' METAMORPHIC REACTIONS IN CARBONATE ROCKS 45 monticellite-melilite facies and (b) the spurrite-merwinite facies. The latter facies is subdivided by REVERDATTO (1964) into (bI) the monticellite-spurrite-tilleyite subfacies developed at relatively low temperature and the (b2) merwinite-calcite subfacies developed at higher temperature.

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