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Fumarolic Ice Tower
A fumarolic ice tower is a tower of ice produced by fumaroles of volcanic activity in an environment whose ambient temperature is below the freezing point of water. They are often underlain by large ice caves. Mount Erebus Mount Erebus () is the southernmost active volcano on Earth, located on Ross Island in the Ross Dependency in Antarctica. With a summit elevation of , it is the second most prominent mountain in Antarctica (after Mount Vinson) and the second ..., the world's southernmost active volcano, is one producer of these ice towers. The ambient temperature at its location is always well below water's freezing point, and the diffuse degassing of carbon dioxide through the steaming warm ground around its flanks causes ice to first melt, then vaporize, and then accumulate into chimney-like towers. Mount Berlin is another Antarctic volcanic mountain that produced such towers. References Glaciovolcanism Fumaroles {{Volcanism-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fumarole
A fumarole (or fumerole) is a vent in the surface of the Earth or another rocky planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids. Fumaroles are characteristic of the late stages of volcanic activity, but fumarole activity can also precede a volcanic eruption and has been used for eruption prediction. Most fumaroles die down within a few days or weeks of the end of an eruption, but a few are persistent, lasting for decades or longer. An area containing fumaroles is known as a fumarole field. The predominant vapor emitted by fumaroles is steam, formed by the circulation of groundwater through heated rock. This is typically accompanied by volcanic gases given off by magma cooling deep below the surface. These volcanic gases include sulfur compounds, such as various sulfur oxides and hydrogen sulfide, and sometimes hydrogen chloride, hydrogen fluoride, and other gases. A fumarole that emits significant sulfur compounds is some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ice Cave
An ice cave is any type of natural cave (most commonly lava tubes or limestone caves) that contains significant amounts of perennial (year-round) ice. At least a portion of the cave must have a temperature below 0 °C (32 °F) all year round, and water must have traveled into the cave’s cold zone. Terminology This type of cave was first formally described by Englishman Edwin Swift Balch in 1900, who suggested the French term ''glacieres'' should be used for them, even though the term ''ice cave'' was then, as now, commonly used to refer to caves simply containing year-round ice. Among speleologists, ''ice cave'' is the proper English term. A cavity formed ''within'' ice (as in a glacier) is properly called a glacier cave. Types Ice caves occur as static ice caves, such as Peña Castil Ice Cave, and dynamic or cyclical ice caves, such as Eisriesenwelt. Temperature mechanisms In most of the world, bedrock caves are thermally insulated from the surface and so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Erebus
Mount Erebus () is the southernmost active volcano on Earth, located on Ross Island in the Ross Dependency in Antarctica. With a summit elevation of , it is the second most prominent mountain in Antarctica (after Mount Vinson) and the second-highest volcano in Antarctica (after the dormant Mount Sidley). It is the highest point on Ross Island, which is also home to three inactive volcanoes: Mount Terror, Mount Bird, and Mount Terra Nova. It makes Ross Island the sixth-highest island on Earth. The mountain was named by Captain James Clark Ross in 1841 for his ship, HMS ''Erebus''. The volcano has been active for around 1.3 million years and has a long-lived lava lake in its inner summit crater that has been present since at least the early 1970s. On 28 November 1979, Air New Zealand Flight 901 crashed on Mount Erebus, killing all 257 people on board. Geology and volcanology Mount Erebus is the world's southernmost active volcano. It is the current eruptive cent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Berlin
Mount Berlin is a glacier-covered volcano in Marie Byrd Land, Antarctica, from the Amundsen Sea. It is a roughly mountain with parasitic vents that consists of two coalesced volcanoes: Berlin proper with the Berlin Crater and Merrem Peak with a crater, away from Berlin. The summit of the volcano is above sea level. It has a volume of and rises from the West Antarctic Ice Sheet. It is part of the Marie Byrd Land Volcanic Province. Trachyte is the dominant volcanic rock and occurs in the form of lava flows and pyroclastic rocks. The volcano began erupting during the Pliocene and was active into the late Pleistocene and the Holocene. Several tephra layers encountered in ice cores all over Antarctica – but in particular at Mount Moulton – have been linked to Mount Berlin, which is the most important source of such tephras in the region. The tephra layers were formed by explosive eruptions that generated high eruption columns. Presently, fumarolic activity occurs at Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glaciovolcanism
Glaciovolcanism is volcanism and related phenomena associated with glacial ice. The ice commonly constrains the erupted material and melts to create meltwater. Considerable melting of glacial ice can create massive lahars and glacial outburst floods known as jökulhlaups. General Three forms of glaciovolcanism are known. Subglacial eruptions occur when a volcano erupts under ice. Such activity can produce landforms such as tuyas and subglacial mounds. Ice-marginal volcanism takes place when material from a subaerial eruption makes lateral contact with ice; ice-marginal lava flows are a product of this phenomenon. Supraglacial eruptions deposit ejecta onto the surface of an ice sheet. World regions identified for possible glaciovolcanic activity include Alaska, and western parts of Canada, southern Chile, Argentina, Iceland, and a couple of regions along Antarctica's coast, such as the Antarctic Peninsula and the Ross Ice Shelf. Volcanologist Bill McGuire noted in 2014, Exampl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
