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Carbon-dioxide discharges are concentrated along zones of seismicity such as the circum-Pacific belt and the alpine belt of southern Europe and Asia Minor. They commonly occur along young orogenic belts and are seldom found in either old orogenic belts or cratonal areas of continents except where the cratons are being fragmented. Submarine springs discharging C02 are known at only a few localities along oceanic crustal spreading centers, but these may indicate a highly common and widespread phenomenon. Geologic and isotopic data indicate that the C02 being discharged from these several tectonic settings is derived variously from (1) organic material, (2) metamorphism of marine carbonate rocks, and (3) the mantle. Production of C02 at depth may develop high pore pressure and thus facilitate slippage of faults. Rapid release of C02 may result in explosive activity.

Map showing world distribution of carbon-dioxide springs and major zones of seismicity