Silica geotemperature mapping and thermal regime in the Mexican Volcanic Belt

Abstract

Geochemical analyses for 176 thermal springs were used to determine their silica temperatures. The main geothermal fields, viz., La Primavera, Los Azufres and Los Humeros were not included to avoid distortion oí the regional trend by these large anomalies. 0n the basis of the obtained temperature data an isotherm map was elaborated. This map shows an homogeneous thermal regime along the Transmexican Volcanic Belt. Ita limita are well defined and it was found that the high temperature zone continues to the West but it is closed to the East. Within the Belt temperatures are high (average temperature• 121 ºC) and a few local maxima are observed that may be related to active geothermal systems.