[1] Extensional accretionary orogens form by creation and destruction of large arc/back arc basin systems, generated by extension and sediment infilling during prolonged slab retreat, but episodically thickened by basin inversion during short‐lived (∼10 Ma), orogenic contraction events. Copyright © 2000-2016 sensagent : Encyclopédie en ligne, Thesaurus, dictionnaire de définitions et plus. We conclude from this that (1) the sense of rota- tion in a given hanging wall does not indicate its trans- port direction and (2) the boundaries between tilted … In some cases the detachments are folded such that the metamorphic rocks are exposed within antiformal closures and these are known as metamorphic core complexes. Chaque lettre qui apparaît descend ; il faut placer les lettres de telle manière que des mots se forment (gauche, droit, haut et bas) et que de la place soit libérée. Tous droits réservés. Wikipedia Definition Extensional tectonics is concerned with the structures formed by, and the tectonic processes associated with, the stretching of a planetary body's crust or lithosphere., Extensional tectonics is concerned with the structures formed by, and the tectonic processes associated with, the stretching of a planetary body's crust or litho. Ajouter de nouveaux contenus Add à votre site depuis Sensagent par XML. Small faults are those that are limited to a single rock body and generally confined to the seismogenic layer. Quick definitions from WordNet (extensional) adjective: used of the class of entities to which a given word correctly applies Also see extensionally Words similar to extensional Usage examples for extensional Popular nouns described by extensional Words that often appear near extensional Rhymes of extensional Invented words related to extensional: Phrases that include extensional: extensional … (2002). Participer au concours et enregistrer votre nom dans la liste de meilleurs joueurs ! L'encyclopédie française bénéficie de la licence Wikipedia (GNU). Ronald L. … Extensional tectonics is concerned with the structures formed, and the tectonic processes associated with, the stretching of the crust or lithosphere. springer. Robert B. Smith. The section reproduced convincingly demon- strates that parts of a given hanging wall may remain unrotated while other parts may rotate in opposite direc- tions. & Brownfield, M.E. a left-stepping bend on a sinistral fault, a zone of extension is generated. Extensional tectonics. [3] Large displacements may juxtapose syntectonic sediments against metamorphic rocks of the mid to lower crust and such structures are called detachment faults. Jump to: navigation, search. Cenozoic geology of the Yerington district, Nevada, and implications for the nature of Basin and Range faulting. Changer la langue cible pour obtenir des traductions. constructive) plate boundaries, but are also commonly found within plates, in the form of localized rift zones and extensional basins, and are also frequently associated with the upper plates of subduction zones, as backarc extensional provinces. They range in width from somewhat less than 100 km up to several hundred km, consisting of one or more normal faults and related fault blocks. En savoir plus. ○   Boggle.  | Informations About Cookies, including instructions on how to turn off cookies if you wish to do so. ○   Boggle. In philosophy of language, a context in which a sub-sentential expression e appears is called extensional if and only if e can be replaced by an expression with the same extension and necessarily preserve truth-value. Extensional tectonics played a major role during the latest stages of exhumation, as shown by collapse folds and brittle shear zones. scale extensional structures that can be classified as follows: Continental lithosphere Narrow rift systems East African rift system, Rhine Graben, North Sea Wide extensional systems Basin and Range Passive margins Bay of Biscay Oceanic lithosphere Young oceanic basins Gulf of Suez, Read Sea Mid ocean ridges Mid-Atlantic ridge Back-arc basins Philippines . [6] After the collision has finished the zone of thickened crust generally undergoes gravitational collapse, often with the formation of very large extensional faults. (adjective) The aim is to assess the structural geometries and hence the mechanisms of continental extensional tectonics. Lab 6: Extensional tectonics Fall 2005 1 The jargon of extensional tectonics For the following terms, draw a simple illustrative diagram consisting of either a map and cross­section or a block diagram: 1. Listric fault 2. Bull. Nature, 294, 410-414. L'encyclopédie française bénéficie de la licence Wikipedia (GNU). Breakaway fault 6. An extensional fault is a fault that vertically thins and horizontally extends portions of the Earth's crust and/or lithosphere. Philosophical Transactions of the Royal Society, London, A, 357, 741-765. 88, 247-66. brittle définition, signification, ce qu'est brittle: 1. delicate and easily broken: 2. unkind and unpleasant: 3. delicate and easily broken: . What does extensional mean? Stressed rocks show varying degrees of strain—the change in the volume and/or shape of the rock because of that stress. Parcourir mots et des phrases milions dans toutes les langues. Extensional tectonics is associated with the stretching and thinning of the crust or lithosphere. This high heat flow often results in moderate temperature (190-230°C) geothermal resources. Park, R.G. Lettris est un jeu de lettres gravitationnelles proche de Tetris. Toutes les traductions de Extensional_tectonics, dictionnaire et traducteur pour sites web. Extensional tectonics led to the formation of strongly subsiding basins (e.g., Saint Florent and Aleria basins), which are filled with sediments up to 2 km thick, deposited since the Burdigalian (Ferrandini et al., 1996) and continuous with the offshore Corsica basin. ○   jokers, mots-croisés Tectonics 17, 604-620. Examples of active pull-apart basins include the Dead Sea, formed at a left-stepping offset of the sinstral sense Dead Sea Transform system, and the Sea of Marmara, formed at a right-stepping offset on the dextral sense North Anatolian Fault system.[9]. Kearey, P., Klepeis, K.A. Les lettres doivent être adjacentes et les mots les plus longs sont les meilleurs. Extensional tectonics is concerned with the structures formed by, and the tectonic processes associated with, the stretching of a planetary body's crust or lithosphere. Graben 7. The definition of dynamic topography used here includes the topographic signature of the lithosphere (e.g. LINEAMENTS AND EXTENSIONAL TECTONICS : EXAMPLES FROM SHABA (ZAIRE) AND NE ZAMBIA by J. DEHANDSCHUTTER and J. LAVREAU (*) ABSTRACT - Fracture and lineament analysis on Landsat imagery of the Shaba­ Northern Zambia region reveals a remarkable persistancy of trends over both cratonic areas and mobile belts. We propose a tectonic model that attributes the flare‐up to decompression melting of lithospheric mantle hydrated by slab‐derived fluids, followed by Oligocene upwelling and melting of enriched mantle that was less extensively modified by hydrous fluids. Il est aussi possible de jouer avec la grille de 25 cases. En savoir plus, Geological environments associated with extensional tectonics, The gravitational spreading of zones of thickened crust, un contenu abusif (raciste, pornographique, diffamatoire). [1], In areas of relatively low crustal stretching, the dominant structures are high to moderate angle normal faults, with associated half grabens and tilted fault blocks. - of, relating to, or marked by extension ; specifically:.... Including instructions on how to turn off cookies if you wish to do so inboard part the. How to turn off cookies if you wish to do so contenant `` extensional played! Des explications et des traductions contextuelles, c'est-à-dire sans obliger votre visiteur à quitter votre page!., Hodges K.V gap i.e on the amount of stretching involved champs sémantiques du dictionnaire intégral TID... Along strike such as to create a gap i.e hanging wall of a term is the result of extensional. The equivalent of the crust or lithosphere subjected to a force at depth analogique en plusieurs langues pour apprendre... During and after extensional fault, dictionnaire de définitions et plus convective.. 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