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Authors: D'Alessandro, W.*
Brusca, L.*
Kyriakopoulos, K.*
Margaritopoulos, M.*
Michas, G.*
Papadakis, G.*
Title: Fluid geochemistry investigations on the volcanic system of methana
Title of journal: Bulletin of the Geological Society of Greece
Series/Report no.: /40 (2007)
Publisher: Geological Society of Greece
Issue Date: May-2007
Keywords: soil gases
CO2 fluxes
gas hazard
groundwater chemistry
Abstract: An extensive geochemical survey on the fluids released by the volcanic/geothermal system of Methana was undertaken. Characterization of the gases was made on the basis of the chemical and isotopic (He and C) analysis of 14 samples. CO2 soil gas concentration and fluxes were measured on the whole peninsula at more than 100 sampling sites. 31 samples of thermal and cold groundwaters were also sampled and analysed to characterize the geochemistry of aquifers. Anomalies referable to the geothermal system, besides at known thermal manifesta-tions, were also recognized at some anomalous degassing soil site and in some cold groundwater. These anomalies were always spatially correlated to the main active tectonic system of the area. The total CO2 output of the volcanic system has been preliminary estimated in about 0.2 kg s-1. Although this value is low compared to other volcanic systems, anomalous CO2 degassing at Methana may pose gas hazard problems. Such volcanic risk, although restricted to limited areas, cannot be neglected and further studies have to be undertaken for its better assessment
Appears in Collections:Papers Published / Papers in press
03.02.03. Groundwater processes
03.04.03. Chemistry of waters
03.04.05. Gases
03.04.06. Hydrothermal systems
03.04.07. Radioactivity and isotopes
04.04.12. Fluid Geochemistry
04.08.01. Gases
04.08.08. Volcanic risk

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