PUMA
Istituto di Geoscienze e Georisorse     
Duchi V., Campana M., Minissale A., Thompson M. Geochemistry of thermal fluids on the volcanic isle of Pantelleria, southern Italy. In: Applied Geochemistry, vol. 9 (2) pp. 147 - 160. Elsevier, 1994.
 
 
Abstract
(English)
Chemical analyses of thermal springs and gas emissions on the volcanic island of Pantelleria, southern Italy, suggest the presence, at depth, of a Na-Cl thermal aquifer near 100C; 80-90% of the water in this aquifer is fed by rainfall and the remainder of the mixture is seawater. Chemical analyses of the gas emissions reveal that below this shallow aquifer, a deeper hydrothermal degassing system (150C) may exist. Rising CO2 causes alteration of the upper aquifer host rocks (most pantellerites), favors formation of Na-HCO3 type waters, and causes eventual precipitation of CaCO3 and coprecipitation of MgCO3 and silica. Comparison of the present chemical data with older data from the literature suggests that the shallow Pantelleria thermal aquifer has increased in salinity and decreased in temperature during the last 25 years. Both effects were apparently caused by increased flow of recent seawater into the system because of increased ground water abstraction in the northern part of the island
URL: http://https://www.journals.elsevier.com/applied-geochemistry/
Subject thermal springs
isotopic composition
gas: analytical data
waters: analytical data
geochemical thermometers
Pantelleria


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