dome

dome
ALASKA VOLCANO OBSERVATORY GLOSSARY
A steep-sided mass of viscous (doughy) lava extruded from a volcanic vent (often circular in plane view) and spiny, rounded, or flat on top. Its surface is often rough and blocky as a result of fragmentation of the cooler, outer crust during growth of the dome.
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GLOSSARY OF VOLCANIC TERMS
A steep-sided mass of lava that is generally formed immediately above the volcanic vent from which it was extruded. Domes are generally circular in plan and have a relatively small surface area relative to other types of lava flows. Domes may be spiny, rounded, or flat on top, and often have rough, blocky surfaces formed by the fragmentation of the dome's crust during intrusion. Domes may grow by extrusion of lava onto the outer surface of a previously formed dome (exogenous dome) or may be formed by inflation of a pre-existing dome (endogenous dome). Domes are most commonly the result of extrusion of viscous lava (primarily of the composition of rhyolite and dacite, but andesite may occur as well).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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Look at other dictionaries:

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  • Dome C — Dôme C Le dôme C, aussi connu sous le nom de dôme Charlie, est un plateau de l Antarctique culminant à 3 233 mètres, de coordonnées 75°06′S 123°20′E / 75.1, 123.333. Il se trouve …   Wikipédia en Français

  • Dome — Dôme Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. En architecture, un dôme est un toit galbé de forme circulaire ou elliptique. Le Dôme est le nom d une salle de spectacles de Marseille (France). Le… …   Wikipédia en Français

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