Análisis comparativo de los valores K (T) para el equilibrio cuarzo/solución de 0 a 100 ºC según los calibrados geotermométricos y las funciones utilizadas en programas de modelización geoquímica

Abstract

Modern geochemical research on geothermal systems is approached through the interactive use of classical geothermometrical techniques and more complex computer codes. This supposes an increase in uncertainities related to the handling of different thermodynamic data-bases. This paper studies the coherence between different silica-quartz geothermometrical calibrates (in the 0-100 ºC temperature interval) and the K (T) expressions for dissolution reaction of quartz used in several geochemical codes. With few exceptions, the log K values calculated by these functions at different temperatures agree well with differences of ± 0,05. Anomalies in several K (T) functions are originated both on the use of some experimental solubility data with methodological problems in their determination and the extrapolation of these functions outside their temperature limits.