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Esperanza Diamond
Crater of Diamonds State Park is a Arkansas state park in Pike County, Arkansas, in the United States. The park features a 37.5-acre (15.2 ha) plowed field, the world's only diamond-bearing site accessible to the public. Diamonds have continuously been discovered in the field since 1906, including the Strawn-Wagner Diamond. The site became a state park in 1972 after the Arkansas Department of Parks and Tourism purchased the site from the Arkansas Diamond Company and Ozark Diamond Mines Corporation, who had previously operated the site as a tourist attraction. History In August 1906, John Huddleston found two strange crystals on the surface of his farm near Murfreesboro, Arkansas. The following month, Huddleston and his wife, Sarah, sold an option on the to a group of Little Rock investors headed by banker-attorney Samuel F. (Sam) Reyburn, who undertook a careful, deliberate test of the property. After 1906, several attempts at commercial diamond mining failed. The only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Murfreesboro, Arkansas
Murfreesboro is a city in, and the county seat of, Pike County, Arkansas, United States. Its population was 1,641 at the 2010 census. The city is known for the Crater of Diamonds State Park located south of the city. History In 1906, diamonds were found on a local farm. It was determined that an 80-acre (32 ha) volcanic formation was the source of the diamonds. The property was eventually sold to the state of Arkansas, which opened the 37-acre Crater of Diamonds State Park to the public. As a tourist attraction a daily fee ($10 in 2021) is charged to search for diamonds. Also located in Murfreesboro is the 1,000-year-old Ka-Do-Ha Indian Village and museum dedicated to it, which offers a field that can be excavated for authentic arrowheads. Geography Murfreesboro is located at (34.066255, -93.689256). According to the United States Census Bureau, the city has a total area of , all land. Demographics 2020 census As of the 2020 United States census, there were 1,495 peop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boomtown
A boomtown is a community that undergoes sudden and rapid population and economic growth, or that is started from scratch. The growth is normally attributed to the nearby discovery of a precious resource such as gold, silver, or oil, although the term can also be applied to communities growing very rapidly for different reasons, such as a proximity to a major metropolitan area, huge construction project, or attractive climate. First boomtowns Early boomtowns, such as Leeds, Liverpool, and Manchester, experienced a dramatic surge in population and economic activity during the Industrial Revolution at the turn of the 19th century. In pre-industrial England these towns had been relative backwaters, compared to the more important market towns of Bristol, Norwich, and York, but they soon became major urban and industrial centres. Although these boomtowns did not directly owe their sudden growth to the discovery of a local natural resource, the factories were set up there to take a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craton
A craton (, , or ; from grc-gre, κράτος "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost layers, the crust and the uppermost mantle. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates; the exceptions occur where geologically recent rifting events have separated cratons and created passive margins along their edges. Cratons are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as several hundred kilometres into Earth's mantle. Terminology The term ''craton'' is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable. Cratons are composed of two layers: A continental ''shield'', in which the basement rock crops out at the surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Upper Mantle (Earth)
The upper mantle of Earth is a very thick layer of rock inside the planet, which begins just beneath the crust (at about under the oceans and about under the continents) and ends at the top of the lower mantle at . Temperatures range from approximately at the upper boundary with the crust to approximately at the boundary with the lower mantle. Upper mantle material that has come up onto the surface comprises about 55% olivine, 35% pyroxene, and 5 to 10% of calcium oxide and aluminum oxide minerals such as plagioclase, spinel, or garnet, depending upon depth. Seismic structure The density profile through Earth is determined by the velocity of seismic waves. Density increases progressively in each layer, largely due to compression of the rock at increased depths. Abrupt changes in density occur where the material composition changes. The upper mantle begins just beneath the crust and ends at the top of the lower mantle. The upper mantle causes the tectonic plates to move. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals and gas bubbles. Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing. Following its ascent through the crust, magma may feed a volcano and be extruded as lava, or it may solidify underground to form an intrusion, such as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamproite
Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock. It has low CaO, Al2O3, Na2O, high K2O/Al2O3, a relatively high MgO content and extreme enrichment in incompatible elements. Lamproites are geographically widespread yet are volumetrically insignificant. Unlike kimberlites, which are found exclusively in Archaean cratons, lamproites are found in terrains of varying age, ranging from Archaean in Western Australia, to Palaeozoic and Mesozoic in southern Spain. They also vary widely in age, from Proterozoic to Pleistocene, the youngest known example from Gaussberg in Antarctica being 56,000 ± 5,000 years old. Lamproite volcanology is varied, with both diatreme styles and cinder cone or cone edifices known. Petrology Lamproites form from partially melted mantle at depths exceeding 150 km. The molten material is forced to the surface in volcanic pipes, bringing with it xenoliths and diamonds from the harzburgitic peridotite or eclogite mantle regi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcano
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Pipe
Volcanic pipes or volcanic conduits are subterranean geological structures formed by the violent, supersonic eruption of deep-origin volcanoes. They are considered to be a type of ''diatreme''. Volcanic pipes are composed of a deep, narrow cone of solidified magma (described as "carrot-shaped"), and are usually largely composed of one of two characteristic rock types — kimberlite or lamproite. These rocks reflect the composition of the volcanoes' deep magma sources, where the Earth is rich in magnesium. Volcanic pipes are relatively rare. They are well known as the primary source of diamonds, and are mined for this purpose. Formation Volcanic pipes form as the result of violent eruptions of deep-origin volcanoes. These volcanoes originate at least three times as deep as most other volcanoes, and the resulting magma that is pushed toward the surface is high in magnesium and volatile compounds such as water and carbon dioxide. As the body of magma rises toward the surface, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crater Of Diamonds State Park Pano
Crater may refer to: Landforms *Impact crater, a depression caused by two celestial bodies impacting each other, such as a meteorite hitting a planet *Explosion crater, a hole formed in the ground produced by an explosion near or below the surface **Subsidence crater, a depression from an underground (usually nuclear) explosion *Pit crater, a crater that forms through sinking of the surface and not as a vent for lava *Volcanic crater, a roughly circular depression in the ground caused by volcanic activity **Caldera, a large cauldron-like depression formed following the evacuation of a magma chamber/reservoir **Maar, a type of volcanic crate caused by a phreatic eruption or explosion **Volcanic crater lake, including a list of lakes that formed in a volcanic or impact crater Music * ''Crater'' (Daniel Menche and Mamiffer album), 2016 *Crater (Fission album), 2004 Places *Crati or Crater, a river of southern Italy *Crater, California, U.S. *Crater (Aden), a district of the Aden Gov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flag Of Arkansas
The flag of Arkansas, also known as the Arkansas flag, consists of a red field charged with a large blue-bordered white lozenge (or diamond). Twenty-nine five-pointed stars appear on the flag: twenty-five small white stars within the blue border, and four larger blue stars in the white diamond. The inscription "ARKANSAS" appears in blue within the white lozenge, with one star above and three stars below. The star above and the two outer stars below point upwards; the inner star below points downwards. The flag was designed by Willie K. Hocker of Wabbaseka, a member of Pine Bluff Chapter of the Arkansas Society of the Daughters of the American Revolution. History In 1912, the Pine Bluff Chapter of the Daughters of the American Revolution decided to present the newly commissioned battleship USS ''Arkansas'' with an official state flag. Upon learning from Secretary of State Earle W. Hodges that there was no state flag, the society members urged him to hold a contest for t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
State Of Arkansas
Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage language, a Dhegiha Siouan language, and referred to their relatives, the Quapaw people. The state's diverse geography ranges from the mountainous regions of the Ozark and Ouachita Mountains, which make up the U.S. Interior Highlands, to the densely forested land in the south known as the Arkansas Timberlands, to the eastern lowlands along the Mississippi River and the Arkansas Delta. Arkansas is the 29th largest by area and the 34th most populous state, with a population of just over 3 million at the 2020 census. The capital and most populous city is Little Rock, in the central part of the state, a hub for transportation, business, culture, and government. The northwestern corner of the state, including the Fayetteville–Springdale– ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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