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Assemblages among tephroite, pyroxmangite, rhodochrosite, quartz: Experimental data and occurrences in the Rhetic Alps

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Abstract

Reactions involving the phases quartz-rhodochrosite-tephroite-pyroxmangite-fluid have been studied experimentally in the system MnO-SiO2-CO2-H2O at a pressure of 2 000 bars and resulted in the following expressions

$$\begin{gathered} {\text{Rhodochrosite + Quartz = Pyroxmangite + CO}}_2 \hfill \\ {\text{ log}}_{{\text{10}}} K^{{\text{2000 bars}}} = - \frac{{11.765}}{T} + 18.618. \hfill \\ {\text{Rhodochrosite + Pyroxmangite = Tephroite + CO}}_2 \hfill \\ {\text{ log}}_{{\text{10}}} K^{{\text{2000 bars}}} = - \frac{{7.083}}{T} + 11.870. \hfill \\ \end{gathered}$$
(1)

which can be used to derive data for the remaining two reactions among the phases under consideration. Field data from the Alps are in agreement with the metamorphic sequence resulting from the experiments.

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Authors and Affiliations

  1. Mineralogisch-Petrographisches Institut der Universität Bern, Die Schweiz

    Tjerk Peters

  2. Mineralogisch-Petrographisches Institut der Universität Basel, Die Schweiz

    Hans Schwander

  3. Institut für Kristallographie und Petrographie der Eidg. Techn. Hochschule Zürich, Die Schweiz

    Volkmar Trommsdorff

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  1. Tjerk Peters
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  2. Hans Schwander
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  3. Volkmar Trommsdorff
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Peters, T., Schwander, H. & Trommsdorff, V. Assemblages among tephroite, pyroxmangite, rhodochrosite, quartz: Experimental data and occurrences in the Rhetic Alps. Contr. Mineral. and Petrol. 42, 325–332 (1973). https://doi.org/10.1007/BF00372610

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  • DOI: https://doi.org/10.1007/BF00372610

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