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Resurgent Dome
In geology, a resurgent dome is a dome formed by swelling or rising of a caldera floor due to movement in the magma chamber beneath it. Unlike a lava dome, a resurgent dome is not formed by the extrusion of highly viscous lava onto the surface, but rather by the uplift and deformation of the surface itself by magma movement underground. Resurgent domes are typically found near the center of very large open calderas such as Yellowstone Caldera or Valles Caldera, and in turn such calderas are often referred to as "resurgent-type" calderas to distinguish them from the more common (but much smaller) calderas found on shield volcanoes and stratovolcanoes. The structure that makes a resurgent dome possible is a fracture zone made up of ring faults surrounded by concentric normal faults around the outside of the rings. During initial formation of the caldera these ring faults provide vents for ash-flow eruptions and are the point at which subsidence of the cauldron block occurs. Subs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toba Zoom
Toba may refer to: Languages * Toba Sur language, spoken in South America * Batak Toba, spoken in Indonesia People * Toba people, indigenous peoples of the Gran Chaco in South America * Toba Batak people, a sub-ethnic group of Batak people from North Sumatra, Indonesia * Tuoba (拓拔), an early name for a clan of the Xianbei people in ancient China * Toba Sōjō (1053–1140), Japanese astronomer and artist-monk * Emperor Toba, emperor of Japan * Toba Spitzer, lesbian rabbi in Arizona, USA * Petre Tobă (born 1964), Romanian politician * Toshimasa Toba (born 1975), Japanese footballer * Georgian Tobă (born 1989), Romanian footballer * Andreas Toba (born 1990), German gymnast Places * Toba, an area in Northern Sumatra that is now included in the Toba Samosir Regency ** Lake Toba, a lake in northern Sumatra, Indonesia, and site of the volcanic Toba eruption 75,000 years ago ** Toba catastrophe theory, according to which modern human evolution was affected by the Toba erup ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blake River Megacaldera Complex
The Blake River Megacaldera Complex is a giant subaqueous caldera cluster or a nested caldera system that spans across the Ontario–Quebec border in Canada. The caldera complex is around 2.7 billion years old, consisting of a series of overlapping calderas of various ages and sizes. It lies within the southern zone of the Abitibi greenstone belt of the Superior Craton and has an area of . The Blake River Megacaldera Complex has been a centre of major interest since 2006 with numerous excursions at the international, national and local level.ASH FALL: Newsletter of the Volcanology and Igneous Petrology Division Geological Association of Canada Retrieved on 2007-09-21 It is a world-class [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Los Frailes Ignimbrite Plateau
Los Frailes is an ignimbrite plateau in Bolivia, between the city of Potosi and the Lake Poopo. It belongs to a group of ignimbrites that exist in the Central Andes and which includes the Altiplano–Puna volcanic complex. The plateau covers a surface of – with about of ignimbrite. The plateau features several putative vents, including Cerro Condor Nasa, Cerro Livicucho, Cerro Pascual Canaviri, Cerro Villacollo and Nuevo Mundo. The plateau was emplaced starting from 25 million years ago to the Holocene, when the Nuevo Mundo vent was active. Geography and geomorphology Los Frailes lies in the Eastern Cordillera of Bolivia, between the southeastern shores of Lake Poopo and the city of Potosi. It is a little-studied volcanic system. Los Frailes belongs to the Central Andean ignimbrites, which cover parts of southern Peru, southwestern Bolivia, northwestern Argentina and northeastern Chile and which contains the Altiplano–Puna volcanic complex. Ignimbrites do not cover a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argentina
Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourth-largest country in the Americas, and the List of countries and dependencies by area, eighth-largest country in the world. Argentina shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a Federation, federal state subdivided into twenty-three Provinces of Argentina, provinces, and one autonomous city, which is the federal capital and List of cities in Argentina by population, largest city of the nation, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a Federalism, federal system. Argentina claims sovereignty ov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jujuy Province
Jujuy is a province of Argentina, located in the extreme northwest of the country, at the borders with Chile and Bolivia. The only neighboring Argentine province is Salta to the east and south. Geography There are three main areas in Jujuy: *The Altiplano, a plateau high with peaks of , covers most of the province. *The Río Grande of Jujuy cuts through the Quebrada de Humahuaca canyon, of heights between . *To the southeast, the sierras descends to the Gran Chaco region. The vast difference in height and climate produces desert areas such as the Salinas Grandes salt mines and subtropical Yungas jungle. The terrain of the province is mainly arid and semi-desertic across the different areas, except for the ''El Ramal'' valley of the San Francisco River. Temperature difference between day and night is wider in higher lands, and precipitation is scarce outside the temperate area of the San Francisco River. The Grande River and the San Francisco River flow to the Berme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coranzulí (caldera)
Coranzulí is a Miocene caldera in northern Argentina's Jujuy Province. Part of the Argentine Andes' volcanic segment, it is considered a member of the Central Volcanic Zone (CVZ). At the heart of the CVZ lies the Altiplano-Puna volcanic complex, a group of volcanoes of which Coranzulí is a part: the complex has produced large ignimbrite sheets with a combined volume approaching . Coranzulí and the majority of the Andean volcanoes formed from the subduction of the oceanic Nazca Plate under the continental South American continental lithosphere. The caldera was probably supplied by a pool of rhyodacitic and rhyolitic magma that formed at the intersection of several faults. It sits on a basement formed by Paleozoic to Miocene volcanic, granitic and sedimentary rocks. The caldera was the source of four large ignimbrites, which were erupted during a single event 6.6 million years ago. The ignimbrites have spread around the caldera and have a total volume of . After their empla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peru
Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pacific Ocean. Peru is a Megadiverse countries, megadiverse country, with habitats ranging from the arid plains of the Pacific coastal region in the west, to the peaks of the Andes mountains extending from the north to the southeast of the country, to the tropical Amazon basin rainforest in the east with the Amazon River. Peru has Demographics of Peru, a population of over 32 million, and its capital and largest city is Lima. At , Peru is the List of countries and dependencies by area, 19th largest country in the world, and the List of South American countries by area, third largest in South America. Pre-Columbian Peru, Peruvian territory was home to Andean civilizations, several cultures during the ancient and medieval periods, and has one o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Department Of Ayacucho
Ayacucho (), known as Huamanga from its creation in 1822 until 1825, is a department and region of Peru, located in the south-central Andes of the country. Its capital is the city of Ayacucho. The region was one of the hardest hit in the 1980s during the guerrilla war waged by Shining Path known as the internal conflict in Peru. A referendum was held on 30 October 2005, in order to decide whether the department would merge with the departments of Ica and Huancavelica to form the new Ica-Ayacucho-Huancavelica Region, as part of the decentralization process in Peru. The proposal failed and no merger was carried out. Political division The department is divided into 11 provinces (, singular: ''provincia''), which are composed of 111 districts (''distritos'', singular: ''distrito''). Provinces The provinces, with their capitals in parentheses, are: # Cangallo (Cangallo) # Huamanga (Ayacucho) # Huanca Sancos (Huanca Sancos) # Huanta (Huanta) # La Mar ( San Miguel) # Lucana ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chiqllarasu
Chiqllarasu ( Quechua, ''chiqlla'' green, Ancash Quechua ''rasu'' snow, ice, mountain with snow, Hispanicized spelling ''Chicllarazo'') Portugueza or PortuguesaThe American Alpine Journal, vol. 20, No. 2, 1976, p. 495: "... I climbed Chicllarazo (16,925 feet, 5167 meters) from here on June 17 via Patahuasi and its west ridge. This is the gray glacier-hung peak seen east from the pass which on modern maps has unnecessarily been called "Nevado Portuguesa ." is a mountain in the Andes of Peru, about high. It is situated in the Ayacucho Region, Cangallo Province, Paras District. Chiqllarasu lies north-east of the mountain Saywa Q'asa, between the villages Patawasi ''(Patahuasi)'' in the northwest and Kichkawasi ''(Quichcahuasi)'' in the southeast. Chiqllarasu lies on the top of the crest of the Western Cordillera. It features a wide caldera, known as the Cerro Sagollan caldera. Within the thick deposits gold and silver have been found. These are epithermal deposits with low su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Zealand
New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of island countries, sixth-largest island country by area and lies east of Australia across the Tasman Sea and south of the islands of New Caledonia, Fiji, and Tonga. The Geography of New Zealand, country's varied topography and sharp mountain peaks, including the Southern Alps (), owe much to tectonic uplift and volcanic eruptions. Capital of New Zealand, New Zealand's capital city is Wellington, and its most populous city is Auckland. The islands of New Zealand were the last large habitable land to be settled by humans. Between about 1280 and 1350, Polynesians began to settle in the islands and subsequently developed a distinctive Māori culture. In 1642, the Dutch explorer Abel Tasman became the first European to sight and record New Zealand. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kermadec Islands
The Kermadec Islands ( ; ) are a subtropical island arc in the South Pacific Ocean northeast of New Zealand's North Island, and a similar distance southwest of Tonga. The islands are part of New Zealand. They are in total area and uninhabited, except for the permanently staffed Raoul Island Station, the northernmost outpost of New Zealand. The islands are listed with the New Zealand outlying islands. The islands are an immediate part of New Zealand, but not part of any region or district, but instead an ''Area Outside Territorial Authority''. Toponymy The islands were named after the Breton captain Jean-Michel Huon de Kermadec, who visited the islands as part of the d'Entrecasteaux expedition in the 1790s. The topographic particle "Kermadec" is of Breton origin and is a lieu-dit in Pencran in Finistère where '' ker'' means village, residence and ''madec'' a proper name derived from '' mad'' (which means 'good') with the suffix '' -ec'', used to form adjectives indicati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Curtis Island (New Zealand)
Curtis Island is an island in the southwest Pacific. It is a volcanic island which, together with neighbouring Cheeseman Island, belongs to the Kermadec Islands, an outlying island group of New Zealand. It is a volcanic island with a fumarolically active crater, while vegetated slopes are nested by seabirds. There are uncertain reports of eruptions and the island has been uplifted by about during the past 200 years. History Lieutenant John Watts, RN was the first European to visit the Macauley and Curtis Islands – which he named after patrons George Mackenzie Macaulay and William Curtis – on the '' Lady Penrhyn'' on 1 July 1788. In 1888 castaway depots were established on both Curtis and Cheeseman islands, for the use of shipwrecked crews. Count von Luckner, commander of the German raider '' Seeadler'' during the First World War, stopped off at Curtis Island in 1917 to replenish his stores from the castaway depot while attempting to make good his escape from New Zea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
