Geotermometría de rocas ígneas. Su aplicación a los basaltos alcalinos de la región volcánica del NE de España

Abstract

The most common geothermometers for igneous basic rocks are reviewed in the first part of the present work. In the second part, several of these geothermometers are applied to the basaltic rocks from the NE Spain region. The temperatures calculated in the principal petrologic types of this region, suggest that the olivine appears at 1240° C in the leucite-basanites; at 1230° C in the nepheline-basanites; and at 1190° C in the olivine basalts. Clinopyroxene temperatures are around 1020° C in the three petrologic types. Finally, plagioclase crystallized at lower temperatures than 1000° C, although this estimation could not be confirmed by the geothermometers used. Concerning the oxygen fugacity, this parameter oscillated between 10^-7.54 and 10^-8.87 atmospheres,when the olivine crystallized.