Características geoquímicas e isotópicas del carbono en el sistema geotérmico de Los Azufres, Mich.

Abstract

We discuss the carbon stable iso tope geochemistry of Los Azufres geothermal system. ·Carbon dioxide gas from the gas phase of 13 productive wells was trapped in a 4N NaOH solution, precipitated as SrC03 and then liberated with 100% H3P04 under vacuum. The libcrated COz was analyzed with a mass spectrometer lo determine 1)13C. The 1)13C values lie in the range -11 to -7%0. It is concluded that the COz from the reservoir of Los Azufres geothermal system is of magmatic origino The enrichment of 1)13C with clevation confirms the existence of boiling and partial condensation in the productive zone of the reservoir.