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Gases from geothermal production wells in Costa Rica, Nicaragua, and El Salvador were collec - ted and analyzed for major and noble gas composition in order to determine the sources of volatiles in active Central American volcanic systems. Ratios of 3He/4He indicate that the upper mantle is the principal source of helium, with minor amounts derived from the crust in the Berlin field of El Salvador. The Miravalles field of Costa Rica is characterized by high CO 2 /3He ratios which are likely a product of increased devolatilization in the southwestern portion of the Cocos plate. The Momotombo field of Nicaragua shows high nitrogen and met- hane concentrations, both of which are likely the product of local contributions within the Nicaraguan Depression. The Central American arc is, in general, characterized by high N 2 /3He ratios and high 3He/4He ratios, a combination which is unusual for island arc systems. The results demonstrate that understanding the gas systematics in geothermal systems, both during initiation and during commercial production, is essential in the planning and maintenance of this important resource.

Los campos geotérmicos de Centroamérica: influencia del proceso de subducción sobre su composición volátil