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
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
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.