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A comment on “Calcic amphibole equilibria and a new amphibole — plagioclase geothermometer” by J.D. Blundy and T.J.B. Holland (Contrib Mineral Petrol (1990) 104: 208–224)

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Conclusions

The calibration by Blundy and Holland is not a calibration of the reaction albite + tremolite = edenite + 4quartz, because the AlIV content of amphiboles is a combined result of \(\vec tk - ,{\text{ }}\vec ed - {\text{ and }}\vec pl - \) substitutions.

The requirements for a calibration of any of these substitutions are: (1) an amphibole-activity model unequivocally accounting for each substitution and (2) a data-set, wherein all amphiboles are buffered by the same assemblages.

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Authors and Affiliations

  1. Institut für Mineralogie und Petrographie, ETH Zürich, Sonneggstrasse 5, CH-8092, Zürich, Switzerland

    Stefano Poli & Max W. Schmidt

  2. Sezione di Mineralogia, Dipartimento Scienze della Terra, Università di Milano, Via Botticelli 23, 1-20133, Milano, Italy

    Stefano Poli

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  1. Stefano Poli
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  2. Max W. Schmidt
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Poli, S., Schmidt, M.W. A comment on “Calcic amphibole equilibria and a new amphibole — plagioclase geothermometer” by J.D. Blundy and T.J.B. Holland (Contrib Mineral Petrol (1990) 104: 208–224). Contrib Mineral Petrol 111, 273–278 (1992). https://doi.org/10.1007/BF00348960

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  • DOI: https://doi.org/10.1007/BF00348960

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