Image subduction01.jpg thumb 300px Geometry of a subduction zone insets to show accretionary wedge accretionary prism and partial melting of hydrated asthenosphere . In geology , subduction is the process ... converge. A subduction zone is an area on Earth where two tectonic plates move towards one another and one slides under the other. Rates of subduction are typically measured in centimeters per ... From the Big Bang to the Ice Age publisher Mancorp pages 325 isbn 0931541611 ref Subduction zones ... plate is always oceanic while the subducting plate may or may not be oceanic . Subduction ... building . This is because subduction processes result in melt of the mantle that produces a volcanic ... to island arc collisions. Subduction zones are the opposite of divergent boundary divergent boundaries , where tectonic plates move apart. General description File SubZone.jpg thumb 300px Subduction ... the top brittle portion of the upper mantle . Subduction zones exist at convergent plate boundaries ... into the Earth s mantle mantle by the downwelling convective currents. It is at subduction zones ... water are recycled into the deep mantle. Earth is the only planet where subduction is known to occur. Without subduction, plate tectonics could not exist. The subducting basalt and sediment are normally ... crystallization geology fractional crystallization . Above subduction zones, volcanoes exist ... by water and concentrated in and around their host volcanoes in rock termed ore . Subduction results ... crust. Theory on origin Although the process of subduction as it occurs today is fairly well ... in the crust for the subduction of the denser material underneath lighter material. ref Cite ... Subduction origin on early Earth A hypothesis journal Geology month December year 2007 volume 35 issue 12 pages 1059 1062 ref A model of the initiation of subduction, based on analytic and analog ... to lead to the initiation of subduction. The analytic part of the model shows that where two lithospheric ... more details
The Lesser Antilles subduction zone is a convergent plate boundary on the seafloor along the eastern margin of the Lesser Antilles island arc. In this subduction zone , oceanic crust of the North American Plate is being subducted under the Caribbean Plate . References reflist http www.agu.org pubs crossref 2003 2002JB002243.shtml Deep structure of an island arc backstop, Lesser Antilles subduction zone , Christeson et al, 2003 Journal of Geophysical Research, V.108, p.2327 Category Plate tectonics Category Lesser Antilles ... more details
The Kermadec Tonga Subduction Zone is a convergent plate boundary which stretches from the North Island of New Zealand northward, and includes the Hikurangi Trough , the Kermadec Trench and the Tonga Trench . Along this zone, the Pacific Plate to the east is subducting beneath the Indo Australian Plate . The southern end of the subduction zone transitions to a right lateral moving transform fault south of the North Island called the Alpine Fault . References http www.ifm geomar.de div projects zealandia english maps.html http www.teara.govt.nz EarthSeaAndSky OceanStudyAndConservation SeaFloorGeology 2 en Category Plate tectonics tectonics stub eu Kermadec Tonga subdukzio eremua ... more details
Image JuandeFucasubduction.jpg thumb Structure of the Cascadia subduction zone Image Cascadia subduction zone USGS.png thumb Area of the Cascadia subduction zone Coord 45 124 type landmark region US dim 500km display title The Cascade Range Cascadia subduction zone also referred to as the Cascadia fault is a subduction zone , a type of convergent boundary convergent plate boundary that stretches from ... also moves, in a general southwest direction, overriding the oceanic plate. The Cascadia Subduction Zone is where the two plates meet. Tectonic processes active in the Cascadia subduction zone region include accretion, subduction, deep earthquakes, and active volcanism that has included such notable ... cite web url http www.emporia.edu earthsci student geller2 cascadia.html title Cascadia Subduction ... in this subduction zone would include Vancouver and Victoria, British Columbia Victoria ... subduction zone varies along its length, depending on the temperature of the subducted oceanic plate ... 12 17 USGS ref At the Cascadia subduction zone, the oceanic plate subducts under the continental plate, which is what normally happens at an oceanic continental convergent boundary . The Cascadia subduction ... sources.png thumb Cascadia earthquake sources Earthquake magnitude The Cascadia subduction zone can ..., although somewhat plastic, can rupture. Great Subduction Zone earthquakes are the largest earthquakes ... Subduction Zone is a very long sloping fault that stretches from mid Vancouver Island to Northern ... large fault area, the Cascadia Subduction Zone could produce a very large earthquake. Thermal and deformation ... K, Spence GD title Reflection signature of seismic and aseismic slip on the northern Cascadia subduction ... slip event on the deeper Cascadia subduction interface journal Science journal Science volume 292 issue ... cite journal author Rogers G, Dragert H title Episodic tremor and slip on the Cascadia subduction ... Professional Paper 1707 ref The next rupture of the Cascadia Subduction Zone will cause widespread ... more details
Summary Cross section of a subduction zone and back arc basin. Made by zyzzy2 Licensing GFDL self with disclaimers migration relicense ... more details
CSZ may refer to ComedySportz , an improvisational comedy show CSZ is the ICAO airline designator for Shenzhen Airlines Cascadia subduction zone disambig de CSZ it CSZ ... more details
Summary Information Description Hydrate distribution relative to subduction zone Source self made Date 2008 Author J. Daugherty other versions Licensing self cc by sa 3.0 GFDL ... more details
The Nazca Ridge is an ocean ridge in the southern Pacific Ocean . It lies on the Nazca Plate and is being subduction subducted in the Peru Chile Trench under the South American Plate by ongoing plate motion. ref http www.cosis.net abstracts EGU05 04873 EGU05 J 04873.pdf Geomorphic Effects in Western Peru due to Subduction of the Nazca Ridge ref References reflist coord missing Category Underwater ridges of the Pacific Ocean Geology stub marine geo stub geology of Chile ca Dorsal de Nazca fr Dorsale Nazca pl Grzbiet Nazca ... more details
A mantle wedge is a zone of Mantle geology mantle , triangular in cross section, that lies between subduction subducting and overriding tectonic plate s. Flow inside the wedge is aligned with plate motions. Flux melting of material within wedge due to the release of volatiles water and carbon dioxide from the underlying subducting slab geology slab results in the volcanism observed above subduction zone s around the world. References Reflist Unreferenced date March 2011 Category Tectonics tectonics stub ... more details
The Intermontane Plate was an ancient oceanic tectonic plate , that lay on the west coast of North America about 195 million years ago. The Intermontane Plate had a chain of volcanic island s called the Intermontane Islands . The Intermontane Islands had been accumulating as a volcanic chain in the Pacific Ocean since Triassic time, beginning around 245 million years ago. The volcanism records yet another subduction zone. Beneath the far edge of the Intermontane microplate, another plate called the Insular Plate was sinking. This arrangement with two parallel subduction zones is unusual. The modern Philippine Islands are located on the Philippine Mobile Belt , one of the few places on Earth where twin subduction zones exist today. Geologists call the ocean between the Intermontane islands and North America the Slide Mountain Ocean . The name comes from the Slide Mountain Terrane , a region made of rocks from the floor of the ancient ocean. The Intermontane Islands collide Over early Jurassic time, the Intermontane Islands and the Pacific Northwest drew closer together as the continent moved west and the Intermontane Microplate subducted. On the continent, subduction supported a new volcanic arc that again sent intruding granite type rocks into the ancient continental sediments. Eventually, about 180 million years ago in the middle Jurassic, the last of the microplate subducted, and the Intermontane Islands collided with the Pacific Northwest. The Intermontane Islands were too big to sink beneath the continent. The subduction zone of the Intermontane Plate shut down, ending the volcanic arc. As the Intermontane Belt accreted to the edge of the continent , the subduction zone of the Insular Plate became the active subduction zone along the edge of the continent. External links http www.washington.edu burkemuseum geo history wa The 20Omineca 20Episode.htm Burke Museum University of Washington Category Tectonic plates Category Historical tectonic plates Category Histori ... more details
This is a cartoon of the subduction factory, generated by Dr. Yoshii Tatsumiat JAMSTEC. He tells me it is not copyrighted and that I am welcome to use it on Wikipedia. PD because The creator of this image, Dr. Yoshii Tatsumiat JAMSTEC, has released his copyright to this image. ... more details
The Lesser Antilles Volcanic Arc is a volcanic arc that forms the eastern boundary of the Caribbean plate . It is part of a subduction zone , also known as the Lesser Antilles subduction zone , where the oceanic crust of the North American Plate is being subducted under the Caribbean Plate. This subduction process formed a number of volcanic islands, from the Virgin Islands in the north to the islands off the coast of Venezuela in the south. The Lesser Antilles Volcanic Arc includes seventeen active volcanoes, notably Soufri re Hills volcano Soufriere Hills on Montserrat , Mount Pel e on Martinique La Grande Soufri re on Guadeloupe Soufri re volcano Soufri re Saint Vincent on Saint Vincent island Saint Vincent and the submarine volcano Kick em Jenny which lies about 10 km north of Grenada . References reflist Macdonald, R., C.J. Hawkesworth, and E. Heath. 2000 . The Lesser Antilles volcanic chain a study in arc magmatism. Earth Science Reviews, Volume 49, Issues 1 4, March 2000, Pages 1 76. doi 10.1016 S0012 8252 99 00069 0. Christeson et al. 2003 http www.agu.org pubs crossref 2003 2002JB002243.shtml Deep structure of an island arc backstop, Lesser Antilles subduction zone . Journal of Geophysical Research, V.108, p. 2327 Category Volcanic arcs es Arco volc nico de las Antillas Menores ... more details
Unreferenced date February 2007 The Catalina Schist is a metamorphism metamorphic rock complex primarily exposed on Santa Catalina Island, California , that formed during the Cretaceous . The Catalina Schist is broadly correlated with the Franciscan Assemblage Franciscan Complex , a similar metamorphic complex formed along the California margin. Both of these units record Blueschist high pressure low temperature metamorphism associated with the subduction of the Farallon plate beneath North America during the Mesozoic . The Catalina Schist is differentiated from the Franciscan primarily in the style of m lange formed during subduction. Category Geography of Los Angeles County, California Category Cretaceous geological sites Category Schist US geology stub ... more details
The Solomon Sea Plate is a minor plate tectonics tectonic plate to the northwest of the Solomon Islands in the south Pacific Ocean . The tectonic regime in this part of the world is extremely complex and involves a number of minor as well as major plates. The Solomon Sea Plate is an oceanic crust al plate remnant which is disappearing into two subduction zones, one to its north, the other on its southwest margin. Its southeast margin runs along the Woodlark Rise, an undefined compressive zone which may be a transform fault marking the boundary with the adjoining Woodlark Plate . The northern subduction zone is located where the Solomon Plate is diving below the South Bismarck Plate to the northwest and the Pacific Plate to the northeast. The northwest part of the subduction zone is called the New Britain Subduction Zone . The southwestern subduction zone is where the Solomon Pate is diving below the Indo Australian Plate . References http walrus.wr.usgs.gov tsunami solomon07 Preliminary Analysis of the April 2007 Solomon Islands Tsunami, Southwest Pacific Ocean, USGS http www.eurekalert.org pub releases 2008 04 uota 1as040208.php Report on interplate propagation of subduction stress rupture, Solomon earthquake of 2007 Tectonic plates SE Asia plates DEFAULTSORT Solomon Sea Plate Category Geology lists Tectonic plates Category Tectonic plates Category Tectonic plates Category Geology of the Pacific Ocean tectonics stub ca Placa de la mar de Salom eu Solomon Itsaso Plaka fr Plaque de la mer des Salomon ja uk zh ... more details
in arc geochemistry can be related to the evolving architecture of that particular subduction ... D Larter, ed, 2003 Intra oceanic Subduction Systems , Geological Society of London. p207 ref Single ..., 2003 Intra oceanic Subduction Systems , Geological Society of London. p208 ref lending weight to the contention ... and Sangihe arcs, eastern Indonesia , in Robert D Larter, ed, 2003 Intra oceanic Subduction ... more details
Image Kermadec Arc.jpg 300px thumb The Kermadec trench is one of Earth s deepest oceanic trench es, reaching a depth of convert 10047 m . Formed by the subduction of the Pacific Plate under the Indo Australian Plate , it runs over a thousand kilometres parallel with and to the east of the Kermadec Ridge and island arc , from near the northeastern tip of New Zealand s North Island to the trench s junction with the Louisville seamount chain northeast of Monowai Seamount . The Tonga Trench marks the continuation of subduction beyond this point. Subduction south of the Kermadec trench is marked by the shallower Hikurangi Trench . Kermadec trench is specially noted by its very abrupt slope. See also Oceanic trench Seismic faults of New Zealand coord 28 S 175 W type waterbody source dewiki display title Category Kermadec Islands Category New Zealand seafloor oceanography Category Oceanic trenches of the Pacific Ocean marine geo stub OutlyingNZ geo stub de Kermadecgraben es Fosa de Kermadec eu Kermadeceko fosa fr Fosse des Kermadec ja pl R w Kermadec pt Fossa de Kermadec ro Groapa Kermadec ru fi Kermadecin hauta zh ... more details
The Alert Bay Volcanic Belt is a heavily eroded Neogene volcanic belt in northern Vancouver Island , British Columbia , Canada . The belt is now north of the Nootka Fault , but may have been directly above the geologic fault fault at the time it last erupted. Eruptions of basalt ic to rhyolite rhyolitic volcano es and hypabyssal rocks of the Alert Bay Volcanic Belt are probably linked with the subduction subducted margin flanked by the Explorer Plate Explorer and Juan de Fuca Plate Juan de Fuca plates at the Cascadia subduction zone . The Alert Bay Volcanic Belt is poorly studied, but appears to have been active in Pliocene and Pleistocene time. No Holocene eruptions are known, and volcanic activity in the belt has most likely ceased. Volcanoes The volcanoes within the belt include Haddington Island British Columbia Haddington Island Twin Peaks British Columbia Twin Peaks Cluxewe Mountain See also Portal Volcanism of Canada Garibaldi Volcanic Belt Pemberton Volcanic Belt BritishColumbiaCoast geo stub coord missing British Columbia Category Volcanism of British Columbia Category Volcanic belts Category Northern Vancouver Island Category Geography of Vancouver Island Category Miocene volcanism Category Pliocene volcanism Category Subduction volcanism ... more details
File LA2 Bering Sea UTM zones.png thumb right Map of the Bering Sea , with the Aleutian Basin clearly discernable here in the southwest portion of the sea. The Aleutian Basin is an oceanic basin under the southwestern Bering Sea . While the northeastern half of the Bering Sea overlies the North American Plate in relatively shallow water, the Aleutian Basin consists of oceanic plate&mdash the remnant of the Kula Plate that was mostly subduction subducted under the North American Plate. Subduction of the Kula Plate ceased after the creation of the Aleutian Trench to its south. What remained of the Kula Plate attached to the North American Plate. This former subduction zone is now the Beringian Margin , which now hosts sixteen submarine canyons , including Zhemchug Canyon , the world s largest. A former island arc called Bowers Ridge is a prominent semi circular shaped geological feature rising from the southern part of the basin where it meets the Aleutian Islands arc. Its formation dates from sometime between the early Mesozoic and the late Tertiary . References http ccom.unh.edu publications Gardner 05 USHydro New views of US continental margins.pdf New Views of the U.S. Continental Margins University of New Hampshire Category Oceanic basins Category Bering Sea marine geo stub es Cuenca aleutiana ... more details
The Okhotsk Chukotka Volcanic Belt OCVB is a Cretaceous volcanic belt in northeastern Eurasia . It is one of the largest subduction zone related volcanic provinces in the world, stretching some 3200 km and comprising about 2 million km sup 3 sup of volcanic and plutonic material. The volcanism within the volcanic belt was related to the subduction of the ancient Kula Plate , which moved in a northward direction about 55 million years ago. References http sbmg.geol.msu.ru pp Tikhomirov Ocvb2 text final.htm New 40Ar 39Ar ages of Cretaceous continental volcanics from central Chukotka implications for initiation and duration of volcanism within northern part of the Okhotsk Chukotka Volcanic Belt northeastern Eurasia , by V. O. Ispolatov, P. L. Tikhomirov, M. Heizler, and I. Yu. Cherepanova. FarEast Russia geo stub coord missing Russia Category Volcanic belts Category Geology of Russia ... more details
In geology , a slab window is a gap that forms in a subduction subducted oceanic crust oceanic plate when a mid ocean ridge meets with a subduction zone. They are commonly associated with the formation of convergent boundary convergent plate boundaries and they have had significant effects on the formation of the Western Cordillera North America Western Cordillera of North America . A slab gap is essentially a zone beneath a section of the earth s crust which lacks the usual rigid layer of the upper mantle it s lithosphere lacking the mantle portion. Such a gap puts the crust in direct contact with the hotter more plastic layer of the mantle. References reflist unreferenced date March 2011 tectonics stub physical oceanography expanded no Category Plate tectonics Category Geological processes ... more details
File Farallon Plate.jpg thumb right A model of the subducting Farallon Plate Farallon Slab under North America In geology , a slab is the portion of a tectonic plate that is being subduction subducted . Slabs constitute an important part of the global plate tectonic system they drive plate tectonics by pulling along the lithosphere to which they are attached in a processes known as slab pull , they cause volcanism due to flux melting of the mantle wedge , and they affect the flow and thermal evolution of the Earth s mantle geology mantle . Their motion can cause dynamic topography dynamic uplift and subsidence of the Earth s surface, forming shallow seaways and potentially rearranging drainage patterns. They have been imaged down to the seismic discontinuities between the upper and lower mantle and to the core mantle boundary . Slab subduction is the mechanism by which lithospheric material is mixed back into the Earth s mantle. References Reflist Unreferenced date March 2011 Category Tectonics tectonics stub ... more details
dablink Obduction is also used in reference to autopsy . unreferenced date March 2008 Obduction is the overthrusting of continental crust by oceanic crust or mantle geology mantle rocks at a convergent plate boundary . It can occur during an orogeny , or mountain building episode. Obduction occurs where a fragment of continental crust geology crust is caught in a subduction zone with resulting overthrusting of oceanic mafic and ultramafic rocks from the mantle onto the continental crust. Obduction often occurs where a small tectonic plate is caught between two larger plates, with the crust both island arc and oceanic welding onto an adjacent continent as a new terrane . When two continental plates collide, obduction of the oceanic crust between them is often a part of the resulting orogeny. The characteristic rocks of obducted oceanic crust are the ophiolites consisting of basalt , gabbro , peridotite , dunite , and eclogite . There are many examples of oceanic crustal rocks and deeper mantle rocks that have been obducted and exposed at the surface worldwide. New Caledonia is one example of recent obduction. The Klamath Mountains of northern California contain several obducted oceanic slabs. Obducted fragments also are found in Oman , Cyprus , Newfoundland island Newfoundland , New Zealand , the Alps of Europe, and the Appalachian Mountains Appalachians of eastern North America . Most obductions appear to have initiated at back arc basin s above subduction zones Citation needed date September 2009 . These basins occur where the edge of the continent collapses seawards, and extension in the back arc basin enhances volcanism and crustal accretion. While the continental crust is being subducted, the upper lithosphere is exposed, and ophiolitic volcanism accretes metamorphic rock series. As orogeny succeeds subduction, the ophiolites and their metamorphic basement end up atop mountain ranges. See also list of tectonic plate interactions subduction Category Plate tectoni ... more details
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