|
Horst And Graben
In geology, horst and graben (or range and valley) refers to topography consisting of alternating raised and lowered fault blocks known as horsts and grabens. The features are created by normal faulting and rifting caused by crustal extension. Horst and graben are formed when normal faults of opposite dip occur in pairs with parallel strike, and are always formed together. Each feature can range in size from a few centimeters up to tens of kilometers, and the vertical displacement can be up to several thousand meters. The movement on either side of each block is typically equal, resulting in little tilting. Features Horst A horst is a section of crust that has been lifted relative to the blocks on either side, which is a result of its bounding faults dipping away from each other. Horsts can form features such as plateaus, mountain ranges or ridges on either side of the valleys. Graben A graben is a section of crust that has lowered relative to the blocks on eithe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tilted Block Faulting
Tilted block faulting, also called rotational block faulting, is a mode of structural evolution in extensional tectonic events, a result of tectonic plates stretching apart. When the upper lithospheric crust experiences extensional pressures, the brittle crust fractures, creating detachment faults. These normal faults express themselves on a regional scale; upper crust fractures into tilted fault blocks, and ductile lower crust ascends. This results in uplift, cooling, and exhumation of ductilely deformed deeper crust. The large unit of tilted blocks and associated crust can form an integral part of metamorphic core complexes, which are found on both continental and oceanic crust. Origin of term The term "tilted block faulting" is a literal description of rotational extension on planar faults, which results in a uniform rotation of faults and crust. Often a "domino-style" stacking of the fault blocks occurs, creating the basis of the terminology. Formation Faulting, tilting, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Half-graben
A half-graben is a geological structure bounded by a fault along one side of its boundaries, unlike a full graben where a depressed block of land is bordered by parallel faults. Rift and fault structure A rift is a region where the lithosphere extends as two parts of the Earth's crust pull apart. Often a rift will form in an area of the crust that is already weakened by earlier geological activity. Extensional faults form parallel to the axis of the rift. An extensional fault may be seen as a crack in the crust that extends down at an angle to the vertical. As the two sides pull apart, the hanging wall ("hanging over" the sloping fault) will move downward relative to the footwall. A rift basin is created as the crust thins and sinks. In the rift basin, warm mantle material wells up, melting the crust and frequently triggering the eruption of volcanoes. Extensional basins may appear to be caused by a graben, or depressed block of land, sinking between parallel normal fault ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rift (geology)
In geology, a rift is a linear zone where the lithosphere is being pulled apart and is an example of extensional tectonics. Typical rift features are a central linear downfaulted depression, called a graben, or more commonly a half-graben with normal faulting and rift-flank uplifts mainly on one side. Where rifts remain above sea level they form a rift valley, which may be filled by water forming a rift lake. The axis of the rift area may contain volcanic rocks, and active volcanism is a part of many, but not all, active rift systems. Major rifts occur along the central axis of most mid-ocean ridges, where new oceanic crust and lithosphere is created along a divergent boundary between two tectonic plates. ''Failed rifts'' are the result of continental rifting that failed to continue to the point of break-up. Typically the transition from rifting to spreading develops at a triple junction where three converging rifts meet over a hotspot. Two of these evolve to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tapti River
The Tapti River (or Tapi) is a river in central India located to the south of the Narmada river that flows westwards before draining into the Arabian Sea. The river has a length of around and flows through the states of Maharashtra, Gujarat and Madhya Pradesh. It flows through the city of Surat, in Gujarat, and is crossed by the Magdalla, ONGC Bridge. On 7 August 1968, before the construction of the Ukai Dam to bring its waters under control and provide hydroelectric power, the Tapti River overflowed its banks during heavy rains in the monsoon season. More than 1,000 people drowned in the flood, and the city of Surat was submerged beneath 10 feet of water for several days. After the floodwaters receded, at least 1,000 more people died in Gujarat during a cholera epidemic from the contamination of the drinking water. The Tapti basin covers parts of Madhya Pradesh, Gujarat and Maharashtra. Course The Tapti River rises in Multai, in Madhya Pradesh, and with a total length ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Narmada River
The Narmada River, previously also known as ''Narbada'' or anglicised as ''Nerbudda'', is the 5th longest river in India and overall the longest west-flowing river in the country. It is also the largest flowing river in the state of Madhya Pradesh. This river flows through the states of Madhya Pradesh and Gujarat in India. It is also known as the "Lifeline of Madhya Pradesh and Gujarat" due to its huge contribution to the two states in many ways. The Narmada River rises from the Amarkantak, Amarkantak Plateau in Anuppur district in Madhya Pradesh. It forms the traditional boundary between North India, North and South India and flows westwards for before draining through the Gulf of Khambhat into the Arabian Sea, west of Bharuch city of Gujarat. It is one of only two major rivers in peninsular India that runs from east to west (longest west flowing river), along with the Tapti River. It is one of the rivers in India that flows in a rift valley, bordered by the Satpura and Vindhy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Satpura Range
The Satpura Range, formerly also known as the Seeonee Hills, is a range of hills in central India. The range rises in eastern Gujarat running east through the border of Maharashtra and Madhya Pradesh and ends in Chhattisgarh. The range parallels the Vindhya Range to the north, and these two east–west ranges divide Indian Subcontinent into the Indo-Gangetic plain of northern India and the Deccan Plateau of the south. The Narmada River originates from north-eastern end of Satpura in Amarkantak, and runs in the depression between the Satpura and Vindhya ranges, draining the northern slope of the Satpura range, running west towards the Arabian Sea. The Tapti River originates in the eastern-central part of Satpura, crossing the range in the center and running west at the range's southern slopes before meeting the Arabian Sea at Surat, draining the central and southern slopes of the range. Multai, the place of Tapti river origin is located about 465 kilometer far, south-westerl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallonia
Wallonia ( ; ; or ), officially the Walloon Region ( ; ), is one of the three communities, regions and language areas of Belgium, regions of Belgium—along with Flemish Region, Flanders and Brussels. Covering the southern portion of the country, Wallonia is primarily Geographical distribution of French speakers, French-speaking. It accounts for 55% of Belgium's territory, but only a third of its population. The Walloon Region and the French Community of Belgium, which is the political entity responsible for matters related mainly to culture and education, are independent concepts, because the French Community of Belgium encompasses both Wallonia and the bilingual Brussels-Capital Region but not the German-speaking Community of Belgium, which administers nine municipalities in Eastern Wallonia. During the Industrial Revolution, Wallonia was second only to the United Kingdom in industrialization, capitalizing on its extensive deposits of coal and iron. This brought the regio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ardennes
The Ardennes ( ; ; ; ; ), also known as the Ardennes Forest or Forest of Ardennes, is a region of extensive forests, rough terrain, rolling hills and ridges primarily in Belgium and Luxembourg, extending into Germany and France. Geologically, the range is a western extension of the Eifel; both were raised during the Givetian age of the Devonian (382.7 to 387.7 million years ago), as were several other named ranges of the same greater range. The Ardennes proper stretches well into Germany and France (lending its name to the Ardennes department and the former Champagne-Ardenne region) and geologically into the Eifel (the eastern extension of the Ardennes Forest into Bitburg-Prüm, Germany); most of it is in the southeast of Wallonia, the southern and more rural part of Belgium (away from the coastal plain but encompassing more than half of the country's total area). The eastern part of the Ardennes forms the northernmost third of the Grand Duchy of Luxembourg, also called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Condroz
The Condroz () is a natural region in Wallonia, the French-speaking part of Belgium, located between the Ardennes and the Meuse. Its unofficial capital is Ciney. The region preserves the name of the Condrusi, a Germanic tribe which inhabited the area during and before the Roman era. Compared to other parts of Belgium, the Condroz is a sparsely populated, agricultural area. It consists of low hills of an average altitude of about . It is mainly situated in the provinces of Liège and Namur and also in smaller parts of the Belgian provinces of Hainaut and Luxembourg. It is bordered in the north by the Meuse river, in the east by the Ardennes, in the south by the Famenne region. Historically, the Condroz did not stretch west of the Meuse, but today there is a western section, south of Namur and the Sambre river stretching to the Thiérache and southern Hainaut. History Very little is known of the Roman era Condrusi, after whom the region was originally named. Julius Cae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basin And Range Province
The Basin and Range Province is a vast United States physiographic region, physiographic region covering much of the inland Western United States and Northern Mexico, northwestern Mexico. It is defined by unique basin and range topography, characterized by abrupt changes in elevation, alternating between narrow faulted mountain chains and flat arid valleys or basins. The physical geography, physiography of the province is the result of Extensional tectonics, tectonic extension that began around 17 million years ago in the early Miocene epoch. The numerous ranges within the province in the United States are collectively referred to as the "Great Basin Ranges", although many are not actually in the Great Basin. Major ranges include the Snake Range, the Panamint Range, the White Mountains (California), White Mountains, and the Sandia Mountains. The highest point fully within the province is White Mountain Peak in California, while the lowest point is the Badwater Basin in Death Valle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology
Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology. It is integrated with Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface and the processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages. By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle the geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth. Geology provides evidence for plate tectonics, the ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
