An estimate of the quantity of the water emitted by the crater vent of Pancutin volcano gives 17,000 tons per day, compared to an average daily emission of lava of 100,000 tons from the lava vents. This quantity of water is believed to be larger than the amount of water one could reasonably expect from the magma rising in the eruptive conduit, and suggests a considerable dilution of magma emission by vapors derived from meteoric waters. The apparent differences between crater vent and lava vent emissions bear out this idea. The imposing eruptive column of a volcano would, in such a case, be no measure of the quantity of magmatic water evolved by a crystallizing magma. It is suggested that groundwaters activated by an intrusion into the zone of these waters may play an important role in the hydration and the alteration of wall rock.

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