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The determination of deep temperatures by means of the CO-CO2-H2-H2O geothermometer: an example using fumaroles in the Campi Flegrei, Italy. A comment

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Abstract

Three points raised in the paper by Tedesco and Sabroux (1987) are dealt with. (1) The inconsistency between the water partial pressure calculated by Tedesco and Sabroux (1987) and saturation pressure is due to the improper use of the water-gas-shift reaction as a geothermometer. In fact Tedesco and Sabroux (1987) do not take into account the distribution of gas species between the coexisting vapour and liquid phases. (2) The depth of the “steam reservoir” is evaluated by Tedesco and Sabroux (1987) in too simplistic a way. This matter should be treated with greater care owing to the high social impact of any consideration on the Phlegraean Fields system. (3) The reliability of carbon monoxide determination at the concentration level encountered at Solfatara depends on the collection method rather than on the gas-chromatographic technique.

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Authors and Affiliations

  1. CNR, Istituto di Geocronologia e Geochimica Isotopica, via C. Maffi 36, Pisa, Italy

    Roberto Cioni

  2. Lungarno Mediceo, Geotermica Italiana, 16, Pisa, Italy

    Luigi Marini

Authors
  1. Roberto Cioni
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  2. Luigi Marini
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Cioni, R., Marini, L. The determination of deep temperatures by means of the CO-CO2-H2-H2O geothermometer: an example using fumaroles in the Campi Flegrei, Italy. A comment. Bull Volcanol 53, 67–69 (1990). https://doi.org/10.1007/BF00680321

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  • DOI: https://doi.org/10.1007/BF00680321

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