Thermodynamic Parameters And Experimental Data For The Na-K-Ca Geothermometer

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Journal Article: Thermodynamic Parameters And Experimental Data For The Na-K-Ca Geothermometer

Abstract
The standard literature values for the thermodynamic parameters of a quartz-two-feldspar reaction are not consistent with the constants of Fournier and Truesdell. The constants in the geothermometer expression have been re-evaluated by the method of leastsquares using both the data compiled by Fournier and Truesdell and new experimental data. The resultant thermodynamic parameters also eliminate feldspar-quartz as the controlling phase assemblage and, in conjunction with experimental observations, suggest that many different alteration phase reactions involving thermodynamically similar clays and zeolites may buffer the solution to the observed compositions. A single formulation of the Na-K-Ca geothermometer may, therefore, be appropriate over a given temperature range for dilute aqueous systems in a number of different altered rocks containing framework silicates. The new constants using the least-squares fit of the Fournier and Truesdell data yield the following revised Na-K-Ca geothermometer equations:

Authors 
Timothy Benjamin, Robert Charles and Rosemary Vidale








Published Journal 
Journal of Volcanology and Geothermal Research, 1983





DOI 
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Citation

Timothy Benjamin,Robert Charles,Rosemary Vidale. 1983. Thermodynamic Parameters And Experimental Data For The Na-K-Ca Geothermometer. Journal of Volcanology and Geothermal Research. (!) .


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