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 .
24-590: (Redirected from Extensions ) [REDACTED] Look up extension , extend , or extended in Wiktionary, the free dictionary. For Misplaced Pages's extended confirmed protection, see Misplaced Pages:Protection policy ยง extended . Extension , extend or extended may refer to: Mathematics [ edit ] Logic or set theory [ edit ] Axiom of extensionality Extensible cardinal Extension (model theory) Extension (predicate logic) ,
48-638: A half-graben geometry. Other common geometries include metamorphic core complexes and tilted blocks . Examples of active continental rifts are the Baikal Rift Zone and the East African Rift . Divergent plate boundaries are zones of active extension as the crust newly formed at the mid-ocean ridge system becomes involved in the opening process. Zones of thickened crust, such as those formed during continent-continent collision tend to spread laterally; this spreading occurs even when
72-660: A line segment (finite) into an infinite line (e.g., extended base ) Exterior algebra , Grassmann's theory of extension, in geometry Field extension , in Galois theory Group extension , in abstract algebra and homological algebra Homotopy extension property , in topology Kolmogorov extension theorem , in probability theory Linear extension , in order theory Sheaf extension , in algebraic geometry Tietze extension theorem , in topology Whitney extension theorem , in differential geometry Music [ edit ] Extension (music) , notes that fit outside
96-607: A line segment (finite) into an infinite line (e.g., extended base ) Exterior algebra , Grassmann's theory of extension, in geometry Field extension , in Galois theory Group extension , in abstract algebra and homological algebra Homotopy extension property , in topology Kolmogorov extension theorem , in probability theory Linear extension , in order theory Sheaf extension , in algebraic geometry Tietze extension theorem , in topology Whitney extension theorem , in differential geometry Music [ edit ] Extension (music) , notes that fit outside
120-469: A village near Regional District of Nanaimo, British Columbia, Canada Extension, Louisiana , unincorporated community, United States Science [ edit ] Extension (geology) , relating to the pulling apart of the Earth's crust and lithosphere Extension (anatomy) , a movement at a joint that increases the angle between the two ends of the joint; the opposite of flexion Extension locus,
144-417: A village near Regional District of Nanaimo, British Columbia, Canada Extension, Louisiana , unincorporated community, United States Science [ edit ] Extension (geology) , relating to the pulling apart of the Earth's crust and lithosphere Extension (anatomy) , a movement at a joint that increases the angle between the two ends of the joint; the opposite of flexion Extension locus,
168-488: Is also the equivalent of the strain parameter stretch . 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 . In areas of high crustal stretching, individual extensional faults may become rotated to too low a dip to remain active and a new set of faults may be generated. Large displacements may juxtapose syntectonic sediments against metamorphic rocks of
192-617: Is different from Wikidata All article disambiguation pages All disambiguation pages extension [REDACTED] Look up extension , extend , or extended in Wiktionary, the free dictionary. For Misplaced Pages's extended confirmed protection, see Misplaced Pages:Protection policy ยง extended . Extension , extend or extended may refer to: Mathematics [ edit ] Logic or set theory [ edit ] Axiom of extensionality Extensible cardinal Extension (model theory) Extension (predicate logic) ,
216-411: Is different from Wikidata All article disambiguation pages All disambiguation pages Extension (geology) The types of structure and the geometries formed depend on the amount of stretching involved. Stretching is generally measured using the parameter β , known as the beta factor , where t 0 is the initial crustal thickness and t 1 is the final crustal thickness. It
240-476: Is offset along strike such as to create a gap e.g. a left-stepping bend on a sinistral fault, a zone of extension or transtension is generated. Such bends are known as releasing bends or extensional stepovers and often form pull-apart basins or rhombochasms . Examples of active pull-apart basins include the Dead Sea , formed at a left-stepping offset of the sinistral sense Dead Sea Transform system, and
264-586: The Niger Delta , large counter-regional faults are observed, dipping back towards the continent, forming large grabenal mini-basins with antithetic regional faults. Areas of extensional tectonics are typically associated with: Rifts are linear zones of localized crustal extension. 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. In individual rift segments, one polarity (i.e. dip direction) normally dominates, giving
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#1732772906370288-490: The Sea of Marmara , formed at a right-stepping offset on the dextral sense North Anatolian Fault system. Back-arc basins form behind many subduction zones due to the effects of oceanic trench roll-back which leads to a zone of extension parallel to the island arc . A passive margin built out over a weaker layer, such as an overpressured mudstone or salt , tends to spread laterally under its own weight. The inboard part of
312-527: The collisional event is still in progress. After the collision has finished the zone of thickened crust generally undergoes gravitational collapse , often with the formation of very large extensional faults. Large-scale Devonian extension, for example, followed immediately after the end of the Caledonian orogeny particularly in East Greenland and western Norway . When a strike-slip fault
336-443: The gene locus of Melanocortin 1 receptor Other uses [ edit ] Agricultural Extension Browser extension , a small software module for customizing a web browser Building extension Continuing education , or extension school, a school for continuing education Cooperative State Research, Education, and Extension Service , a former division of the U.S. Department of Agriculture Extension (metaphysics) ,
360-443: The gene locus of Melanocortin 1 receptor Other uses [ edit ] Agricultural Extension Browser extension , a small software module for customizing a web browser Building extension Continuing education , or extension school, a school for continuing education Cooperative State Research, Education, and Extension Service , a former division of the U.S. Department of Agriculture Extension (metaphysics) ,
384-485: The mid to lower crust and such structures are called detachment faults . 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 . Passive margins above a weak layer develop a specific set of extensional structures. Large listric regional faults dipping towards the ocean develop with rollover anticlines and related crestal collapse grabens . On some margins, such as
408-600: The property of stretching out or taking up space Extension (telephone) , telephone line attached to a main line or to a PBX or Centrex system Extension cord , power cable with a plug on one end and one or more sockets on the other end Eyelash extensions , material applied to eyelashes Hair extensions , strands of hair added to existing hair Extension, the building of community capacity by outsiders, for instance agricultural extension Filename extension , for computer file systems See also [ edit ] Extensive (disambiguation) Topics referred to by
432-600: The property of stretching out or taking up space Extension (telephone) , telephone line attached to a main line or to a PBX or Centrex system Extension cord , power cable with a plug on one end and one or more sockets on the other end Eyelash extensions , material applied to eyelashes Hair extensions , strands of hair added to existing hair Extension, the building of community capacity by outsiders, for instance agricultural extension Filename extension , for computer file systems See also [ edit ] Extensive (disambiguation) Topics referred to by
456-415: The same term [REDACTED] This disambiguation page lists articles associated with the title Extension . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Extension&oldid=1252386483 " Category : Disambiguation pages Hidden categories: Short description
480-415: The same term [REDACTED] This disambiguation page lists articles associated with the title Extension . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Extension&oldid=1252386483 " Category : Disambiguation pages Hidden categories: Short description
504-476: The set of tuples of values that satisfy the predicate Extension (semantics) , the set of things to which a property applies Extension by definitions Extensional definition , a definition that enumerates every individual a term applies to Extensionality Other uses [ edit ] Extension of a function , defined on a larger domain Extension of a polyhedron , in geometry Extension of
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#1732772906370528-423: The set of tuples of values that satisfy the predicate Extension (semantics) , the set of things to which a property applies Extension by definitions Extensional definition , a definition that enumerates every individual a term applies to Extensionality Other uses [ edit ] Extension of a function , defined on a larger domain Extension of a polyhedron , in geometry Extension of
552-535: The standard range Extended (Solar Fields album) , 2005 Extension (George Braith album) , 1964 Extension (Clare Fischer album) , 1963 Extensions (Ahmad Jamal album) , 1965 Extensions , a 1969 album by Mystic Moods Orchestra Extensions (McCoy Tyner album) , 1970 Extensions (Dave Holland album) , 1988 Extensions (The Manhattan Transfer album) , 1979 Extension (The Extended Mixes), 2023 album reissue by Kylie Minogue Places [ edit ] Extension, British Columbia ,
576-535: The standard range Extended (Solar Fields album) , 2005 Extension (George Braith album) , 1964 Extension (Clare Fischer album) , 1963 Extensions (Ahmad Jamal album) , 1965 Extensions , a 1969 album by Mystic Moods Orchestra Extensions (McCoy Tyner album) , 1970 Extensions (Dave Holland album) , 1988 Extensions (The Manhattan Transfer album) , 1979 Extension (The Extended Mixes), 2023 album reissue by Kylie Minogue Places [ edit ] Extension, British Columbia ,
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