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Mount Slesse
Slesse Mountain, usually referred to as Mount Slesse, is a mountain just north of the United States, US-Canada border, in the North Cascades, Cascade Mountains of British Columbia, near the town of Chilliwack. It is notable for its large, steep local relief. For example, its west face drops over to Slesse Creek in less than . It is also famous for its huge Northeast Buttress; see the climbing notes below. The name means "fang" in the Halqemeylem, Halkomelem language. Notable nearby mountains include Mount Rexford and Canadian Border Peak in British Columbia, and American Border Peak, Mount Shuksan, and Mount Baker, all in the United States, US state of Washington (state), Washington. Geology Most of Mount Slesse is made up of granitic rocks related to the Chilliwack batholith, which intruded the region 26 to 29 million years ago after the major orogeny, orogenic episodes in the region. This is part of the Pemberton Volcanic Belt, an eroded volcanic belt that formed as a result o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skagit Range
The Skagit Range ( ) is a Mountain range#Sub-ranges, subrange of the Cascade Range in southwestern British Columbia, Canada and northwestern Washington (state), Washington, United States, which are known in Canada as the Canadian Cascades or, officially, the Cascade Mountains. The Skagit Range lies to the west of the Skagit River and east and north of the Chilliwack River and flanks the Upper Fraser Valley region of British Columbia's Lower Mainland. Of the three subranges of the Canadian Cascades—the Skagit, Hozameen Range, Hozameen, and Okanagan Range, Okanagan ranges—the Skagit is the most mountainous. It continues north to the Fraser River, sometimes using different local names. The Hope Mountains, and the "Anderson River Group" are separated from the main Skagit Range by distinct natural boundaries, but are otherwise similar in character. Geography According to Fred Beckey there are differences of opinion about the names and locations of the subranges of the north ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Rexford
Mount Rexford is a prominent mountain summit located in the Cascade Mountains of southwestern British Columbia, Canada. It is situated north of the Canada–United States border, west of Chilliwack Lake, and east of Slesse Mountain, which is its nearest higher neighbor. Precipitation runoff from the peak drains into Nesakwatch and Centre Creeks, both tributaries of the Chilliwack River. Originally known as ''Ensawkwatch'', the mountain was named for an early settler in the area, Rexford, who had a cabin near Slesse Creek and had trap lines in the vicinity. The mountain has two subsidiary peaks known as the Nesakwatch Spires. The mountain's name was officially adopted on June 2, 1950, by the Geographical Names Board of Canada. Mount Rexford was first climbed in July 1951 by Herman Genschorek and Walt Sparling via the West Ridge. Geology Mount Rexford is composed of granitic rock related to the Chilliwack batholith, which intruded the region 26 to 29 million years ago after th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phyllite
Phyllite ( ) is a type of foliated metamorphic rock created from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation.Stephen Marshak ''Essentials of Geology'', 3rd ed. It is primarily composed of quartz, sericite mica, and chlorite. Phyllite has fine-grained mica flakes, whereas slate has extremely fine mica flakes, and schist has large mica flakes, all mica flakes of which have achieved a preferred orientation. Among foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist. The minute crystals of graphite, sericite, or chlorite, or the translucent fine-grained white mica, impart a silky, sometimes golden sheen to the surfaces of cleavage, called "phyllitic luster". The word comes from the Greek ''phyllon'', meaning "leaf". The protolith (or parent rock) for phyllite is shale or pelite, or slate, which in turn came from a shale protolith. Its constituent platy minerals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darrington, Washington
Darrington is a town in Snohomish County, Washington, United States. It is located in a North Cascades mountain valley formed by the Sauk and North Fork Stillaguamish rivers. Darrington is connected to nearby areas by State Route 530, which runs along the two rivers towards the city of Arlington, located to the west, and Rockport. It had a population of 1,347 at the 2010 census. Non-indigenous settlement in the area began in 1891 at the site of a Skagit campsite between the two rivers, near the traditional home of the Sauk-Suiattle tribe. Prospectors had arrived in the area during the 1880s while looking for gold and other minerals, but were quickly displaced by the logging industry that would come to dominate Darrington for much of the 20th century. The Northern Pacific Railway built a branch line to the town in 1901 and ushered in several years of growth. During the Great Depression, Darrington hosted a Civilian Conservation Corps camp that improved roads, trails, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Farallon Plate
The Farallon Plate was an ancient oceanic plate. It formed one of the three main plates of Panthalassa, alongside the Phoenix Plate and Izanagi Plate, which were connected by a triple junction. The Farallon Plate began subducting under the west coast of the North American Plate—then located in modern Utah—as Pangaea broke apart and after the formation of the Pacific Plate at the centre of the triple junction during the Early Jurassic. It is named for the Farallon Islands, which are located just west of San Francisco, California. Over time, the central part of the Farallon Plate was completely subducted under the southwestern part of the North American Plate. The remains of the Farallon Plate are the Juan de Fuca, Explorer and Gorda Plates, subducting under the northern part of the North American Plate; the Cocos Plate subducting under Central America; and the Nazca Plate subducting under the South American Plate. The Farallon Plate is also responsible for transporting old i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subduction
Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle. A region where this process occurs is known as a subduction zone, and its surface expression is known as an arc-trench complex. The process of subduction has created most of the Earth's continental crust. Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately two to eight centimeters per year along most plate boundaries. Subduction is possible because the cold oceanic lithosphere is slightly denser than the underlying asthenosphere, the hot, ductile layer in the upper mantle underlying the cold, rigid lithosphere. Once initiated, stable subduction is driven mostly by the negative buoyancy of the de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Belt
A volcanic belt is a large volcanically active region. Other terms are used for smaller areas of activity, such as volcanic fields. Volcanic belts are found above zones of unusually high temperature () where magma is created by partial melting of solid material in the Earth's crust and upper mantle. These areas usually form along tectonic plate boundaries at depths of . For example, volcanoes in Mexico and western North America are mostly in volcanic belts, such as the Trans-Mexican Volcanic Belt that extends from west to east across central-southern Mexico and the Northern Cordilleran Volcanic Province in western Canada. The deeply deformed and eroded remnants of ancient volcanic belts are found in volcanically inactive regions such as the Canadian Shield. It contains over 150 volcanic belts (now deformed and eroded down to nearly flat plains) that range from 600 to 1,200 million years old. These are zones of variably metamorphosed mafic to ultramafic volcanic sequences wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orogeny
Orogeny is a mountain building process. An orogeny is an event that takes place at a convergent plate margin when plate motion compresses the margin. An ''orogenic belt'' or ''orogen'' develops as the compressed plate crumples and is uplifted to form one or more mountain ranges. This involves a series of geological processes collectively called orogenesis. These include both structural deformation of existing continental crust and the creation of new continental crust through volcanism. Magma rising in the orogen carries less dense material upwards while leaving more dense material behind, resulting in compositional differentiation of Earth's lithosphere ( crust and uppermost mantle). A synorogenic process or event is one that occurs during an orogeny. The word "orogeny" () comes from Ancient Greek (, , + , , ). Although it was used before him, the term was employed by the American geologist G. K. Gilbert in 1890 to describe the process of mountain-building as distinguished f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chilliwack Batholith
The Chilliwack Batholith is a large batholith that forms much of the North Cascades in southwestern British Columbia, Canada and the U.S. state of Washington. The geological structure is named after the Chilliwack River Valley, where it outcrops in many places. It does not outcrop anywhere near the City of Chilliwack. The Chilliwack Batholith is part of the Pemberton Volcanic Belt and is the largest mass of exposed intrusive rock in the Cascade Volcanic Arc The Cascade Volcanoes (also known as the Cascade Volcanic Arc or the Cascade Arc) are a number of volcanoes in a volcanic arc in western North America, extending from southwestern British Columbia through Washington and Oregon to Northern Calif .... The age of the Chilliwack batholith ranges from 26 to 29 million years old. References Pemberton Volcanic Belt Igneous petrology of Washington (state) Batholiths of North America Igneous petrology of British Columbia Paleogene magmatism {{US-geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Washington (state)
Washington (), officially the State of Washington, is a state in the Pacific Northwest region of the Western United States. Named for George Washington—the first U.S. president—the state was formed from the western part of the Washington Territory, which was ceded by the British Empire in 1846, by the Oregon Treaty in the settlement of the Oregon boundary dispute. The state is bordered on the west by the Pacific Ocean, Oregon to the south, Idaho to the east, and the Canadian province of British Columbia to the north. It was admitted to the Union as the 42nd state in 1889. Olympia is the state capital; the state's largest city is Seattle. Washington is often referred to as Washington state to distinguish it from the nation's capital, Washington, D.C. Washington is the 18th-largest state, with an area of , and the 13th-most populous state, with more than 7.7 million people. The majority of Washington's residents live in the Seattle metropolitan area, the center of trans ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Baker
Mount Baker (Lummi: '; nok, Kw’eq Smaenit or '), also known as Koma Kulshan or simply Kulshan, is a active glacier-covered andesitic stratovolcano in the Cascade Volcanic Arc and the North Cascades of Washington in the United States. Mount Baker has the second-most thermally active crater in the Cascade Range after Mount St. Helens. About due east of the city of Bellingham, Whatcom County, Mount Baker is the youngest volcano in the Mount Baker volcanic field. While volcanism has persisted here for some 1.5 million years, the current volcanic cone is likely no more than 140,000 years old, and possibly no older than 80–90,000 years. Older volcanic edifices have mostly eroded away due to glaciation. After Mount Rainier, Mount Baker has the heaviest glacier cover of the Cascade Range volcanoes; the volume of snow and ice on Mount Baker, is greater than that of all the other Cascades volcanoes (except Rainier) combined. It is also one of the snowiest places in the world; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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