|
Central Colorado Volcanic Field
The central Colorado volcanic field (CCVF) is a volcanic field in Park County, Colorado, Park County, Colorado. It is located in the southern Rocky Mountains and covered a roughly triangular area centered on the Thirtynine Mile volcanic area and extending from the Sawatch Range southeast to the northern Sangre de Christo Range and the Wet Mountains and northeast to the southern Front Range south of Denver. The area covered by the volcanic products of the eruptions included some produced by at least ten volcanic centers or calderas. The field overlaps the San Juan volcanic field to the west. The volcanic products date from the late Eocene to the early Oligocene (). Economic significance Rocks of the CCVF host base metal, base- and precious metal deposits, including the volcanic diatreme at Cripple Creek, Colorado, Cripple Creek, the site of a notable gold rush beginning in 1890. By 1900, more than 500 mines had been established in the Cripple Creek district, and the population e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Park County, Colorado
Park County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 17,390. The county seat is Fairplay. The county was named after the large geographic region known as South Park, which was named by early fur traders and trappers in the area. Park County is included in the Denver-Aurora- Lakewood, CO Metropolitan Statistical Area. A majority of the county lies within the boundaries of the South Park National Heritage Area. The geographic center of the State of Colorado is located in Park County. Park County has been and is the location of several important mines, including the defunct Orphan Boy, which was discovered near Alma in 1861 and produced gold, silver, lead, and zinc. The historic Sweet Home Mine, also near Alma, is a former silver mine now known for its rhodochrosite mineral specimens. Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.8%) is water. The headwaters of the S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diatreme
A diatreme, sometimes known as a maar-diatreme volcano, is a volcanic pipe formed by a gaseous explosion. When 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 sa ... rises up through a crack in Earth's crust and makes contact with a shallow body of groundwater, rapid expansion of heated water vapor and volcanic gases can cause a series of explosions. A relatively shallow crater (known as a ''maar'') is left, and a rock-filled fracture (the actual diatreme) in the crust. Diatremes breach the surface and produce a steep, inverted cone shape. The term ''diatreme'' has been applied more generally to any concave body of broken rock formed by explosive or hydrostatics, hydrostatic forces, whether or not it is related to volcanism. The word comes . Global distribution Maar-diatreme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Park County, Colorado
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, stratification, rock exposure and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodies and sub-surface features. Mountains, hills, plateaux, and plains are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Fields Of Colorado
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] |
Central Colorado
Central Colorado is a region of the U.S. state of Colorado. Central Colorado is home to most of the population of the state and its geography is dominated by the Rocky Mountains, their foothills, mesas, and canyons, the rivers that run through them, and the open plains off the foothills. Central Colorado can be separated into two regions known as the north central region and the south central region. Central Colorado is home to the state's two largest cities, Denver and Colorado Springs. Central Colorado, has developed many campgrounds. Counties North Central counties * Adams County * Arapahoe County * Clear Creek County * Denver County * Gilpin County * Jefferson County * Summit County South Central counties * Douglas County * El Paso * Park County * Teller County Larger Cities North Central cities * Aurora * Black Hawk * Central City * Denver * Georgetown * Lakewood * Fort Collins South Central cities * Castle Rock * Colorado Springs Colorado Spring ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Volcanoes In The United States
A list of volcanoes in the United States and its territories. Alaska American Samoa Arizona California Colorado Hawaii /[./[Https://www.sci.news/geology/puhahonu-shield-volcano-08435.html Puhahonu - - - Unknown Idaho Illinois Louisiana Michigan Mississippi Missouri Nevada New Hampshire New Jersey New Mexico Sierra Grande -. -. -. 2.41 to 2.88 million years ago Northern Mariana Islands Oregon Texas Utah Virginia Washington Wyoming See also *Geothermal energy in the United States *List of Cascade volcanoes * List of large volume volcanic eruptions in the Basin and Range Province * List of volcanoes in Canada *List of volcanoes in Mexico *List of volcanoes in Russia *List of volcanic craters in Alaska *List of volcanic craters in Ari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geographic Coordinates
The geographic coordinate system (GCS) is a spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others. Although latitude and longitude form a coordinate tuple like a cartesian coordinate system, the geographic coordinate system is not cartesian because the measurements are angles and are not on a planar surface. A full GCS specification, such as those listed in the EPSG and ISO 19111 standards, also includes a choice of geodetic datum (including an Earth ellipsoid), as different datums will yield different latitude and longitude values for the same location. History The invention of a geographic coordinate system is generally credited to Eratosthenes of Cyrene, who composed his now-lost ''Geography'' at the Library of Alexandria in the 3rd century ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Construction Aggregate
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt; the aggregate serves as reinforcement to add strength to the overall composite material. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are also used as base material under foundations, roads, and railroads. In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties (e.g. to help prevent differential settling under the road or building), or as a low-cost exten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dimension Stone
Dimension stone is natural stone or rock that has been selected and finished (e.g., trimmed, cut, drilled, ground, or other) to specific sizes or shapes. Color, texture and pattern, and surface finish of the stone are also normal requirements. Another important selection criterion is durability: the time measure of the ability of dimension stone to endure and to maintain its essential and distinctive characteristics of strength, resistance to decay, and appearance. Quarries that produce dimension stone or crushed stone (used as construction aggregate) are interconvertible. Since most quarries can produce either one, a crushed stone quarry can be converted to dimension stone production. However, first the stone shattered by heavy and indiscriminate blasting must be removed. Dimension stone is separated by more precise and delicate techniques, such as diamond wire saws, diamond belt saws, burners (jet-piercers), or light and selective blasting with Primacord, a weak explosive. St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhyolite
Rhyolite ( ) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and plagioclase. It is the extrusive equivalent to granite. Rhyolitic magma is extremely viscous, due to its high silica content. This favors explosive eruptions over effusive eruptions, so this type of magma is more often erupted as pyroclastic rock than as lava flows. Rhyolitic ash-flow tuffs are among the most voluminous of continental igneous rock formations. Rhyolitic tuff has been extensively used for construction. Obsidian, which is rhyolitic volcanic glass, has been used for tools from prehistoric times to the present day because it can be shaped to an extremely sharp edge. Rhyolitic pumice finds use as an abrasive, in concrete, and as a soil amendment. Description Rhyolite i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Castle Rock, Colorado
Castle Rock is a home rule town that is the county seat and the most populous municipality of Douglas County, Colorado, United States. The town population was 73,158 at the 2020 United States Census, a 51.68% increase since the 2010 United States Census. Castle Rock is the most populous Colorado town (rather than city) and the 16th most populous Colorado municipality. Castle Rock is a part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area and the Front Range Urban Corridor. The town is named for the prominent, castle-shaped butte near the center of town. History The region in and around Castle Rock was originally home to the Arapaho and Cheyenne peoples. They occupied the land between the Arkansas and South Platte Rivers. White settlers were drawn to the area by rumors of gold and by land opened through the Homestead Act of 1862. However, the discovery of rhyolite stone, not gold, ultimately led to the settlement of Castle Rock. Castle Rock was founded in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extrusive Rock
Extrusive rock refers to the mode of igneous volcanic rock formation in which hot magma from inside the Earth flows out (extrudes) onto the surface as lava or explodes violently into the Earth's atmosphere, atmosphere to fall back as Pyroclastic rock, pyroclastics or tuff. In contrast, intrusive rock refers to rocks formed by magma which cools below the surface.Jain, Sreepat (2014). ''Fundamentals of Physical Geology''. New Delhi, India: Springer. . The main effect of extrusion is that the magma can cool much more quickly in the open air or under seawater, and there is little time for the growth of crystals. Sometimes, a residual portion of the matrix (geology), matrix fails to crystallize at all, instead becoming a natural glass or obsidian. If the magma contains abundant Volatiles, volatile components which are released as free gas, then it may cool with large or small vesicles (bubble-shaped cavities) such as in pumice, scoria, or vesicular texture, vesicular basalt. Other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Landforms Of Park County, Colorado")
.svg "Click for more on -> Castle Rock, Colorado")
