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Geochemistry of thermal fluids on the volcanic isle of Pantelleria, southern Italy

Applied Geochemistry

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Abstract

Chemical analyses of thermal springs and gas emissions on the volcanic island of Pantelleria, southern Italy, suggest the presence, at depth, of a NaCl thermal aquifer near 100??C; 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 (>150??C) may exist. Rising CO2 causes alterations of the upper aquifer host rocks (mostly pantellerites), favors formation of NaHCO3 type waters, and causes eventual rpecipitation 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 a. 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. ?? 1994.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geochemistry of thermal fluids on the volcanic isle of Pantelleria, southern Italy
Series title:
Applied Geochemistry
Volume
9
Issue:
2
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Applied Geochemistry
First page:
147
Last page:
160
Number of Pages:
14