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Tenchen Glacier
Tenchen Glacier is located on the eastern flank of Mount Edziza in northwestern British Columbia, Canada. It lies within an immense cirque whose headwall has breached the eastern side of Mount Edziza's summit volcanic crater, crater. At the head of Tenchen Glacier are icefalls that drape down shear, cliffs from the breached eastern crater rim; permanent ice fills the summit crater. Meltwater from Tenchen Glacier feeds Tenchen Creek which eventually merges with Kakiddi Creek. The name of the glacier was suggested by the Geological Survey of Canada on November 19, 1979, and eventually became official on November 24, 1980. ''Tenchen'' is derived from the Tahltan words ''ten'' and ''chen'', which mean ''ice'' and ''dirty'' respectively. The name of this glacier is a reference to its debris-covered surface. Geology The Tenchen cirque is the product of erosion that gradually enlarged an initial scar formed by an explosive eruption that blew away part of the eastern summit crater rim. H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Glacier
A glacier (; ) is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires distinguishing features, such as crevasses and seracs, as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques, moraines, or fjords. Although a glacier may flow into a body of water, it forms only on land and is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water. On Earth, 99% of glacial ice is contained within vast ice sheets (also known as "continental glaciers") in the polar regions, but glaciers may be found in mountain ranges on every continent other than the Australian mainland, including Oceania's high-latitude oceanic island countries such as New Zealand. Between latitudes 35°N and 35°S, glaciers occur only in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explosive Eruption
In volcanology, an explosive eruption is a volcanic eruption of the most violent type. A notable example is the 1980 eruption of Mount St. Helens. Such eruptions result when sufficient gas has dissolved under pressure within a viscous magma such that expelled lava violently froths into volcanic ash when pressure is suddenly lowered at the vent. Sometimes a lava plug will block the conduit to the summit, and when this occurs, eruptions are more violent. Explosive eruptions can expel as much as per second of rocks, dust, gas and pyroclastic material, averaged over the duration of eruption, that travels at several hundred meters per second as high as into the atmosphere. This cloud may subsequently collapse, creating a fast-moving pyroclastic flow of hot volcanic matter. Stages of an explosive eruption An explosive eruption begins with some form of blockage in the crater of a volcano that prevents the release of gases trapped in highly viscous andesitic or rhyolitic magm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tencho Glacier
Tencho Glacier is a mountain glacier in northwestern British Columbia, Canada. It is located inside Mount Edziza Provincial Park on the Tahltan Highland, an upland area of the Stikine Plateau. Tencho Glacier is the source of several small streams that flow from the Mount Edziza volcanic complex. Etymology The name of the glacier was suggested by the Geological Survey of Canada on November 15, 1979, and eventually became official on November 24, 1980. ''Tencho'' is derived from the Tahltan words ''ten'' and ''cho'', which mean ''ice'' and ''big'' or ''great'' respectively. This glacier is so-named because it is the largest glacier of the Mount Edziza volcanic complex. Geography Tencho Glacier originates from Ice Peak and Tennena Cone on the southern flank of Mount Edziza. Its southern terminus is surrounded by Kaia Bluff in the southeast, Coffee Crater in the south and Cocoa Crater in the southwest. Unnamed tributaries of Taweh Creek originate from the southwestern side of Tencho G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Idiji Glacier
Idiji Glacier is one of several glaciers draining the eastern side of the Mount Edziza ice cap in northwestern British Columbia, Canada. It is located south of the summit of Mount Edziza in a cirque just southeast of Ice Peak. Idiji Glacier is separated from the much larger Tencho Glacier by a ridge that extends south of Ice Peak above the Idiji cirque headwall. Idiji Glacier is the namesake of Idiji Ridge which is just to the southeast. The name of the glacier was suggested by the Geological Survey of Canada on November 15, 1979, and eventually became official on November 24, 1980. ''Idiji'' means "it thunders" in the Tahltan language, which refers to the loud noises stemming from this very active glacier. At the head of Idiji Glacier are rocks assigned to the upper assemblage of the Ice Peak Formation. They consist of trachyte, benmoreite, mugearite, tristanite, trachybasalt and alkali basalt that are in the form of lava flows, lava domes and pyroclastic breccia. B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Glaciers In Canada
This is a list of glaciers in Canada. List of glaciers Saint Elias Mountains *Donjek Glacier *Hubbard Glacier * Logan Glacier Coast Mountains Boundary Ranges * Juneau Icefield ** Llewellyn Glacier *Hang Ten Icefield *Stikine Icecap **Great Glacier * Andrei Icefield **Andrei Glacier **Choquette Glacier ** Hoodoo Glacier ** Johnson Glacier **Porcupine Glacier ** Twin Glacier * Salmon Glacier * Cambria Icefield Pacific Ranges *Monarch Icefield * Ha-Iltzuk Icefield **Klinaklini Glacier ** Silverthrone Glacier * Waddington Massif- Pantheon Range- Whitemantle Range ** Waddington Glacier ** Tiedemann Glacier ** Scimitar Glacier **Parallel Glacier **Franklin Glacier **Bell Glacier (Canada) ** Cannonade Glacier **Remote Glacier **Shadow Glacier ** Fan Glacier **Geddes Glacier ** Chaos Glacier ** Radiant Glacier **Cataract Glacier **Isolation Glacier ** Shiverick Glacier **Malemute Glacier ** Sunrise Glacier ** Tellot Glacier **Smoking Cannon Glacier **Jambeau Glacier **Chanterelle Gl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratovolcano
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as . Stratovolcanoes are sometimes called composite volcanoes because of their composite stratified structure, built up from sequential outpourings of erupted materials. They are among the most common types of volcanoes, in contrast to the less common shield ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edziza Formation
The Edziza Formation is a stratigraphic unit of Pleistocene age in northwestern British Columbia, Canada. First described in 1984, the Edziza Formation was mapped as one of several geological formations of the Mount Edziza volcanic complex. It overlies at least four other geological formations of this volcanic complex that differ in age and composition. The main volcanic rock comprising the Edziza Formation is trachyte which was deposited by volcanic eruptions at the end of the Volcanism of the Mount Edziza volcanic complex#Third magmatic cycle, third magmatic cycle of the Mount Edziza volcanic complex 0.9 million years ago. Trachyte of the Edziza Formation is in the form of lava flows and pyroclastic rocks that comprise the central stratovolcano of Mount Edziza, as well as lava domes on its summit and flanks. At least four lava lakes ponded inside the summit volcanic crater, crater which cooled into four rock units that are exposed in the breached eastern crater rim. These lava l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava Lake
Lava lakes are large volumes of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad depression. The term is used to describe both lava lakes that are wholly or partly molten and those that are solidified (sometimes referred to as ''frozen lava lakes''). Formation Lava lakes can form in three ways: *from one or more vents in a crater that erupts enough lava to partially fill the crater; or *when lava pours into a crater or broad depression and partially fills the crater; or *atop a new vent that erupts lava continuously for a period of several weeks or more and slowly builds a crater progressively higher than the surrounding ground. Behaviors Lava lakes occur in a variety of volcanic systems, ranging from the basaltic Erta Ale lake in Ethiopia and the basaltic andesite volcano of Villarrica, Chile, to the unique phonolitic lava lake at Mt. Erebus, Antarctica. Lava lakes have been observed to exhibit a range of behaviours. A "constantly circu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrothermally Altered
Metasomatism (from the Greek μετά ''metá'' "change" and σῶμα ''sôma'' "body") is the chemical alteration of a rock by hydrothermal and other fluids. It is the replacement of one rock by another of different mineralogical and chemical composition. The minerals which compose the rocks are dissolved and new mineral formations are deposited in their place. Dissolution and deposition occur simultaneously and the rock remains solid. Synonyms to the word metasomatism are metasomatose and metasomatic process. The word metasomatose can also be used as a name for specific varieties of metasomatism (for example '' Mg-metasomatose'' and '' Na-metasomatose''). Metasomatism can occur via the action of hydrothermal fluids from an igneous or metamorphic source. In the igneous environment, metasomatism creates skarns, greisen, and may affect hornfels in the contact metamorphic aureole adjacent to an intrusive rock mass. In the metamorphic environment, metasomatism is creat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tahltan
The Tahltan or Nahani are a First Nations people of the Athabaskan-speaking ethnolinguistic group who live in northern British Columbia around Telegraph Creek, Dease Lake, and Iskut. The Tahltan constitute the fourth division of the ''Nahane'' (People of the West). Culture The Tahltan cultural practices and lifeways varied widely as they were often widely separated and would have to endure varying conditions depending on their locality. In Tahltan culture it was believed that some of their ancestors had knowledge that others did not from times before a great flood. Some of these ancestors used that knowledge for the good of the people, while others used it for evil and to the disadvantage of others. Raven is considered to be the protagonist hero against these evil ancestors. Social organization Tahltan social organization is founded on matriarchy and intermarriage between two main clan designations. The two main clans of Tahltan people are Tses' Kiya (pronounced Tses-kee-y ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Edziza
Mount Edziza is a stratovolcano in the Stikine Country of northwestern British Columbia, Canada. The volcano and the surrounding area are protected within Mount Edziza Provincial Park and Recreation Area, Mount Edziza Provincial Park. It consists of multiple peaks and ridges, with several glaciers flowing in all directions. The summit is topped by an ice-filled caldera, which is almost wide. The three main peaks around the summit caldera are the southwest summit, the southeast summit and the north summit. Ice Peak overlaps the southern flank of Mount Edziza. Mount Edziza is one of Canada's highest volcanoes at . Snow and ice covered Mount Silverthrone in southwestern British Columbia has a height of . History As early as 10,000 years ago, the Tahltan people, who now live in Dease Lake, Telegraph Creek and the Iskut, British Columbia, Iskut, used obsidian from Mount Edziza to make tools and weapons for trading material. This is the main source of obsidian found in northwestern B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kakiddi Creek
Kakiddi Creek is a tributary of the Klastline River in northwest part of the province of British Columbia, Canada. It flows north about through two lakes in a broad hummocky lowland to join the Klastline River, which in turn is a tributary of the Stikine River. Kakiddi Creek forms the northeastern boundary of Mount Edziza Provincial Park which lies within the traditional territory of the Tahltan people. Kakiddi Creek's watershed covers and its estimated mean annual discharge is . The mouth of Kakiddi Creek is located about west of Iskut, east of Telegraph Creek and about south-southwest of Dease Lake. Kakiddi Creek's watershed's land cover is classified as 46.6% conifer forest, 17.4% barren, 15.4% shrubland, 11.2% herbaceous, 5.4% snow/glacier, and small amounts of other cover. Geography Kakiddi Creek originates with several small streams flowing into Kakiddi Lake on the northeastern side of the Mount Edziza volcanic complex, a linear group of volcanoes on the Tahltan Highlan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
