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Authors: Inguaggiato, S.* 
Martin-Del Pozzo, A.L.* 
Aguayo, A.* 
Capasso, G.* 
Favara, R.* 
Title: Isotopic, chemical and dissolved gas constraints on spring water from Popocatepetl volcano (Mexico): evidence of gas–water interaction between magmatic component and shallow fluids
Issue Date: 2005
Series/Report no.: 141(2005)
DOI: 10.1016/j.jvolgeores.2004.09.006
Keywords: Popocatepetl volcano
helium isotope composition
carbon isotope composition
dissolved gases
gas–water interaction
Subject Classification03. Hydrosphere::03.02. Hydrology::03.02.03. Groundwater processes 
03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases 
03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems 
04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
Abstract: Geochemical research was carried out on cold and hot springs at Popocatepetl (Popo) volcano (Mexico) in 1999 to identify a possible relationship with magmatic activity. The chemical and isotopic composition of the fluids is compatible with strong gas–water interaction between deep and shallow fluids. In fact, the isotopic composition of He and dissolved carbon species is consistent with a magmatic origin. The presence of a geothermal system having a temperature of 80–1008 C was estimated on the basis of liquid geothermometers. A large amount of dissolved CO2 in the springs was also detected and associated with high CO2 degassing.
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