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Rhyolite Dome
In volcanology, a lava dome is a circular, mound-shaped protrusion resulting from the slow Extrusive rock, extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of Types of volcanic eruptions, eruptions on Earth form lava domes. The geochemistry of lava domes can vary from basalt (e.g. Semeru, 1946) to rhyolite (e.g. Chaitén (volcano), Chaiten, 2010) although the majority are of intermediate composition (such as Santa María (volcano), Santiaguito, dacite-andesite, present day). The characteristic dome shape is attributed to high viscosity that prevents the lava from lava flow, flowing very far. This high viscosity can be obtained in two ways: by high levels of silicon dioxide, silica in the magma, or by degasification, degassing of fluid magma. Since viscous basaltic and andesitic domes weathering, weather fast and easily break apart by further input of fluid lava, most of the preserved domes h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Volcán Chaitén-Sam Beebe-Ecotrust
Volcan or Volcán may refer to: Places *Volcán, Panama, town in Panama *Volcán (Jujuy), town in Argentina Other uses *Volcan (mining company), Peruvian mining company *Volcán River, Chile *Volcán Lake, Bolivia *Volcán (album), a 1978 album by José José People with the surname *Erin Volcán (born 1984), Venezuelan swimmer *Mickey Volcan (born 1962), Canadian ice hockey player *Mike Volcan (1932–2013), Canadian football player *Ramón Volcán (born 1956), Venezuelan swimmer See also *Vulcan (other) *Vulkan (other) *Volcano (other) *Volcanic (other) {{disambiguation, geo, surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
