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Zykov Glacier
Zykov Glacier () is a valley glacier in northern Victoria Land, Antarctica, east of Saddle Peak and Mount Kostka in the Anare Mountains. It is about 25 miles (40 km) long, and flows northwest, reaching the Pennell Coast between Cape Williams and Cooper Bluffs. Photographed by the Soviet Antarctic Expedition from the survey ship ''Ob'' in 1958, it was named by them for student navigator Ye. Zykov, who died in Antarctica, February 3, 1957. The underlying rock includes micaceous phyllite and micaceous schist; it was estimated by radioisotope dating ( potassium–argon) in 1964 to be 410 or 420 million years old. A separate study of metamorphic rocks recovered from near the glacier (1959–62) found evidence of thermal crystallisation.Scientific and Technical Aerospace Reports' 6 (5): 651 See also * List of glaciers in the Antarctic There are many glaciers in the Antarctic. This set of lists does not include ice sheets, ice caps or ice fields, such as the Antarctic ice ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C70195s1 Ant
C7, C07 or C-7 may refer to: Vehicles (including military) * C-7 Caribou, a military transport aircraft * AEG C.VII, a World War I German armed reconnaissance aircraft * AGO C.VII, a World War I German reconnaissance aircraft * Albatros C.VII, a World War I German military reconnaissance aircraft * C-7, a United States Navy C class blimp and the first airship inflated with helium * Chevrolet Corvette (C7), the seventh generation of a sports car made by General Motors * Fokker C.VII, a 1928 Dutch reconnaissance seaplane * HMS C7, HMS ''C7'', a British Royal Navy C-class submarine * Sauber C7, a 1983 Group C prototype race car * USS Cincinnati (C-7), USS ''Cincinnati'' (C-7), a United States Navy protected cruiser Science * Caldwell 7 (NGC 2403), a spiral galaxy in Camelopardalis Technology * Nokia C7-00, a touch screen mobile from Nokia * VIA C7, an IA-32 central processing unit by VIA Technologies * C7, an incandescent light bulb of the size typically used in nightlights and Chris ... [...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] |
Zykov Island
Zykov Island () is a small island between Fulmar Island and Buromskiy Island in the Haswell Islands, near Queen Mary Land on Antarctica. It was discovered and first mapped by the Australasian Antarctic Expedition under Douglas Mawson of 1911–14 but mistakenly identified as part of Fulmar Island. Remapped by the Soviet expedition of 1956, it was named for Ye. Zykov, a student navigator who died in Antarctica on 3 February 1957. Research has been done around the island. Because of its remoteness, the undisturbed benthic zone of Zykov Island was studied from 1970 to 1972, with underwater dives and sample collections. A decade later, the University of Canterbury studied '' Paramoera walkeri'' on Zykov Island and elsewhere in the Antarctic. See also * List of antarctic and sub-antarctic islands * Zykov Glacier Zykov Glacier () is a valley glacier in northern Victoria Land, Antarctica, east of Saddle Peak and Mount Kostka in the Anare Mountains. It is about 25 miles (40 km) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Glaciers In The Antarctic
There are many glaciers in the Antarctic. This set of lists does not include ice sheets, ice caps or ice fields, such as the Antarctic ice sheet, but includes glacial features that are defined by their flow, rather than general bodies of ice. The lists include outlet glaciers, valley glaciers, cirque glaciers, tidewater glaciers and ice streams. Ice streams are a type of glacier and many of them have "glacier" in their name, e.g. Pine Island Glacier. Ice shelves are listed separately in the List of Antarctic ice shelves. For the purposes of these lists, the Antarctic is defined as any latitude further south than 60° (the continental limit according to the Antarctic Treaty System). List by letters * List of glaciers in the Antarctic: A–H * List of glaciers in the Antarctic: I–Z See also * List of Antarctic and subantarctic islands * List of Antarctic ice rises * List of Antarctic ice shelves * List of Antarctic ice streams * List of glaciers * List of subantar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamic Quartz Recrystallization
Quartz is the most abundant single mineral in the earth's crust (although behind the feldspar group when taken collectively), and as such is present in a very large proportion of rocks both as primary crystals and as detrital grains in sedimentary and metamorphic rocks. Dynamic recrystallization is a process of crystal regrowth under conditions of stress and elevated temperature, commonly applied in the fields of metallurgy and materials science. Dynamic quartz recrystallization happens in a relatively predictable way with relation to temperature, and given its abundance quartz recrystallization can be used to easily determine relative temperature profiles, for example in orogenic belts or near intrusions. Mechanisms of recrystallization Previous research has outlined several dislocation creep regimes present in experimental conditions. Two main mechanisms for altering grain boundaries have been defined. The first is the process by which quartz softens as temperature increases ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphic Rock
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than and, often, elevated pressure of or more, causing profound physical or chemical changes. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. The protolith may be an igneous, sedimentary, or existing metamorphic rock. Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by their protolith, their chemical and mineral makeup, and their texture. They may be formed simply by being deeply buried beneath the Earth's surface, where they are subject to high temperatures and the great pressure of the rock layers above. They can also form from tectonic processes such as continental collisions, which cause horizontal pressure, friction, and distorti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
K–Ar Dating
Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology. It is based on measurement of the product of the radioactive decay of an isotope of potassium (K) into argon (Ar). Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites. In these materials, the decay product is able to escape the liquid (molten) rock, but starts to accumulate when the rock solidifies ( recrystallizes). The amount of argon sublimation that occurs is a function of the purity of the sample, the composition of the mother material, and a number of other factors. These factors introduce error limits on the upper and lower bounds of dating, so that the final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure or open air. Time since recrystallization is calculated by measuring the ratio of the amount of accumulated to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radioisotope Dating
Radiometric dating, radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of Earth itself, and can also be used to date a wide range of natural and man-made materials. Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geologic time scale. Among the best-known techniques are radiocarbon dating, potassium–argon dating and uranium–lead dating. By ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schist
Schist ( ) is a medium-grained metamorphic rock showing pronounced schistosity. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. This texture (geology), texture reflects a high content of platy minerals, such as micas, talc, chlorite group, chlorite, or graphite. These are often interleaved with more granular minerals, such as feldspar or quartz. Schist typically forms during regional metamorphism accompanying the process of mountain building (orogeny) and usually reflects a medium Metamorphism#Metamorphic grades, grade of metamorphism. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs. Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a ''mica schist''). Where the type of the original rock (the protolith) is discernible, the schist is us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Antarctic Expedition
The Soviet Antarctic Expedition (SAE or SovAE) (russian: Советская антарктическая экспедиция, САЭ, ''Sovetskaya antarkticheskaya ekspeditsiya'') was part of the Arctic and Antarctic Research Institute of the Soviet Committee on Antarctic Research of the Academy of Sciences of the USSR. The Soviet Union's Ministry of Sea Transport was responsible for the administration, logistics and supply of the expeditions. The first Soviet contact with Antarctica was in January 1947 when the Slava whaling flotilla began whaling in Antarctic waters. Stations The first Soviet Antarctic station, '' Mirny'', was established near the coast on February 13, 1956. This was added to in December 1957 by another station, ''Vostok'' built inland near the south geomagnetic pole. Year-round stations * Mirny (established February 13, 1956) * Vostok (established December 16, 1957) * Novolazarevskaya (established January 18, 1961) * Molodyozhnaya (established January 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valley
A valley is an elongated low area often running between Hill, hills or Mountain, mountains, which will typically contain a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacier, glacial ice. These glaciers may remain present in valleys in high mountains or polar areas. At lower latitudes and altitudes, these glaciation, glacially formed valleys may have been created or enlarged during ice ages but now are ice-free and occupied by streams or rivers. In desert areas, valleys may be entirely dry or carry a watercourse only rarely. In karst, areas of limestone bedrock, dry valleys may also result from drainage now taking place cave, underground rather than at the surface. Rift valleys arise principally from tectonics, earth movements, rather than erosion. Many different types of valleys are described by geographers, using terms th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cooper Bluffs
Zykov Glacier () is a valley glacier in northern Victoria Land, Antarctica, east of Saddle Peak and Mount Kostka in the Anare Mountains. It is about 25 miles (40 km) long, and flows northwest, reaching the Pennell Coast between Cape Williams and Cooper Bluffs. Photographed by the Soviet Antarctic Expedition from the survey ship ''Ob'' in 1958, it was named by them for student navigator Ye. Zykov, who died in Antarctica, February 3, 1957. The underlying rock includes micaceous phyllite and micaceous schist; it was estimated by radioisotope dating ( potassium–argon) in 1964 to be 410 or 420 million years old. A separate study of metamorphic rocks recovered from near the glacier (1959–62) found evidence of thermal crystallisation.Scientific and Technical Aerospace Reports' 6 (5): 651 See also * List of glaciers in the Antarctic * Zykov Island Zykov Island () is a small island between Fulmar Island and Buromskiy Island in the Haswell Islands, near Queen Mary Land o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
