Abstract
A soil gas profiling made along the southern basis of Soufrière summit lava dome, in Guadeloupe, reveals the existence of diffuse emanations of magma-derived CO 2 in coincidence with a major volcanic (Ty) fault, where CO 2 concentrations at 70 cm depth in the ground reach 35–96 % and are associated with a thermal convective cell. Outside, a few ‘cold’ gaseous anomalies of volcanic origin (lack of methane) provide reliable conditions for continuous radon monitoring of soil degassing.
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