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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 CO/sub 2/ 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 CO/sub 2/ 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 CO/sub 2/ at depth may develop high pore pressure and thus facilitate slippage of faults. Rapid release of CO/sub 2/ may result in explosive activity.

Global distribution of carbon dioxide discharges, and major zones of seismicity