phreatomagmatic

phreatomagmatic

[frē¦ad·ō·mag′mad·ik]
(geology)
Pertaining to a volcanic explosion that extrudes both magmatic gases and steam; it is caused by the contact of the magma with groundwater or ocean water.
References in periodicals archive ?
Two papers study the evolution of the Santa Ana crater lake during 1992-2007, focusing on the 2006-2007 period when the lake drowned the eruptive vent following the 2005 phreatomagmatic eruption, and test a GPS monitoring system on the site.
According to Wikipedia, geologists agree that Al Wahba Crater is classified as a Mr Crater which is caused by a phreatomagmatic eruption-an explosion caused by groundwater coming into contact with hot lava or magma.
The breccia is interpreted to be phreatomagmatic in origin similar to a mineralized breccia observed at the La Renata workings some 1.
For pyroclastic eruptions of magmatic or phreatomagmatic origin, the high heat capacity and thermal conductivity of water leads to rapid heat transfer and potentially to another phase of fragmentation (Gudmundsson, 2003).
Key words: Bubble-wall texture, CIPW norm, ignimbrites, lava-domes, phreatomagmatic eruptions, pyroclastic flows, modal compositions, normal composition, shards
These phreatomagmatic explosive eruptions result from the interaction of highly charged fluid-rich magmas with the water saturated country rocks into which they are intruding.
4) is a phreatomagmatic basaltic volcano that erupted through wet lake and floodplain sediments.
Key words: caldera, eruption unit, ignimbrite, domes, magmatic eruption, phreatomagmatic eruption, pyroclastic flow, pyroclastic surge.
El Socorro in Jalisco consists of silver bearing veins and breccias in the project area, which are localized along the west flank of a large phreatomagmatic breccia system.
The northeast-southwest trending gold mineralization is associated with phreatomagmatic dacitic breccias cut by variable amounts of multiphase quartz veins and veinlets.
27 Hydrothermal phreatomagmatic breccia, abundant dark grey, fine banded quartz veinlets.
One of these is Cerro Crespo where high grade silver+gold mineralization is associated with vuggy silica and phreatomagmatic breccias within a 600 metre by 250 metre area.