A lava dome is a circular, mound-shaped protrusion formed by the slow extrusion of viscous lava from a volcano, common in convergent plate boundary settings and responsible for around six percent of Earth's eruptions. The characteristic dome shape results from the lava's high viscosity, which prevents it from flowing far, produced either by high silica content in the magma or by degassing of fluid magma. Because low-silica domes weather quickly and break apart when more fluid lava is added, most preserved lava domes have high silica content and consist of rhyolite or dacite.
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Associated With: Rhyolite, Lead section
Since viscous basaltic and andesitic domes weather fast and easily break apart by further input of fluid lava, most of the preserved domes have high silica content and consist of rhyolite or dacite.
Associated With: Dacite, Lead section
Since viscous basaltic and andesitic domes weather fast and easily break apart by further input of fluid lava, most of the preserved domes have high silica content and consist of rhyolite or dacite.
In Discipline: Volcanology, Lead paragraph
In volcanology, a lava dome is a circular, mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano
Caused By: Volcanism, Lead paragraph
In volcanology, a lava dome is a circular, mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano
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