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Authors: Martin-Del Pozzo, A.L.* 
Inguaggiato, S.* 
Aceves, F.* 
Saenz, H.* 
Aguayo, A.* 
Title: Spring water and CO2 interaction at Popocatépetl volcano, Mexico
Issue Date: 2002
Series/Report no.: 3/41(2002)
Keywords: Manantiales
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
05. General::05.02. Data dissemination::05.02.01. Geochemical data 
Abstract: Six years of monitoring HCO3- and pH at selected springs at Popocatepetl during the present eruptive period are presented. Small peaks in HCO3- concentration and PCO2 in springs are associated with small magmatic pulses at Popocatépetl volcano. The magma provides CO2-rich fluids into the water system controlled by meteoric recharge. The PCO2 in equilibrium with the springs is two to four orders of magnitude higher than air-saturated water. The high partial pressure of CO2 also suggests a direct interaction with the magmatic fluids. The isotopic signature of carbon as well, supports a magmatic origin for dissolved CO2.
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