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Sentence Examples This is consistent with the S shape of isotherms in all numerical models simulating temperature evolution in subduction zones. The tensional stresses in the uplift can be relaxed by, for example, underthrusting in a subduction zone, or contraction in surrounding regions. The magmas that formed the batholith were generated in response to the subduction of the Farallon plate beneath the North American plate. Undated glaucophane schists in the suture zone in Transbaikalia confirm the operation of subduction processes. An alternative mechanism to open the rift basins is subduction rollback of the Indian plate to the west of Thailand. These extensional faults were reactivated as reverse faults during Neogene compression associated with subduction beneath the North Island. What remains unclear is whether the rocks formed in an open ocean or a marginal back-arc basin associated with a subduction zone. The surface of Venus appears to be dominated by volcanic hot spots rather than spreading and subduction associated with plate tectonics. There are two possible tectonic settings for the deep subduction of Indian Plate continental crust in the early Tertiary. When convergence rate and subduction rate differ, the trench migrates with respect to a fixed point in the overriding plate interior. The polarity of the postulated Carboniferous subduction at Alexander Island is unknown. The Spontang ophiolitc, for example, is associated with partial subduction of buoyant continental crust. Around both zones accretionary wedges are indications of Cretaceous subduction. The most widely accepted view is that of an accretionary prism developed above an active subduction zone. Palaeozoic volcanicity was conspicuous along active continental margins especially where there was subduction. Nevertheless, subduction of Africa beneath Iberia starting in the Late Eocene has been proposed. Only the upper 4 km of this sequence is accreting at the current subduction zone. Overthrusting, volcanism, and plutonic igneous intrusion were identified as originating above the subduction zone where one plate is forced beneath the edge of its neighbour. Slab pull is the theory in which subduction of the earth's crust is thought to pull the plates apart. These rocks are interpreted as a forearc succession that developed in association with north-directed subduction beneath the Lhasa terrane. Show More Sentences Most of the world's active above-sea volcanoes are located near convergent plate boundaries where subduction is occurring, particularly around the Pacific basin. They are interpreted to have been derived from subduction modified lithospheric and asthenospheric mantle sources. Increasing proximity to a subduction zone during plate convergence is indicated by the appearance of felsic tuff. The contemporaneity in ophiolite formation and felsic arc magmatism suggests that intraoceanic subduction started soon after the opening of the ocean basin. The most conspicuous outboard structure is the accretionary wedge that lies just continentward of the ocean trench, the bathymetric manifestation of the subduction zone. The most persuasive evidence for the existence of subduction zones is the narrow Benioff zones of earthquake epicentres dipping away from deep-sea trenches. Overall the temporal progradation of nappe emplacement and high-pressure metamorphism towards the south mimics the southward retreat of the Hellenic subduction zone. Recent studies proposed that the Cretan detachment is a shallowly north-dipping normal fault, which formed subparallel to the subjacent subduction thrust in the Early Miocene. These igneous rocks record the extensive magmatism that resulted from northward subduction of Neotethyan oceanic lithosphere beneath the Lhasa terrane. The South Sandwich Islands constitute a volcanic island arc which results from this active subduction. They are poorly preserved in the sedimentary record, because they tend to be consumed by the subduction process. The subduction process consumes older oceanic lithosphere, so oceanic crust is seldom more than 200 million years old. The elements of an active oceanic basin often include the oceanic trench associated with a subduction zone. This tectonic plate converges with the Cocos, Nazca, and North American plates to form the Middle America Trench, a major subduction zone. The eastward Gibraltar Arc oceanic subduction system was active during the Early and Middle Miocene and has likely been inactive since. The Puerto Rico trench is at a complex transition from the subduction boundary to the south and the transform boundary to the west. This boundary is in part the result of transform faulting along with thrust faulting and some subduction. This subduction forms the volcanoes of Guatemala, El Salvador, Nicaragua, and Costa Rica, also known as the Central America Volcanic Arc. This tectonic movement is caused by the subduction of the Nazca Plate underneath the South American Plate. The Andes are the result of plate tectonics processes, caused by the subduction of oceanic crust beneath the South American Plate. Show More Sentences The Andean volcanism is a result of subduction of the Nazca Plate and Antarctic Plate underneath the South American Plate. The islands are part of a volcanic arc, the Sunda Arc, formed by subduction along the Sunda Trench in the Java Sea. The Benham Plateau to the east in the Philippine Sea is an undersea region active in tectonic subduction. To the north lies the Cascadia subduction zone, where the Gorda Plate is being subducted under the margin of the North American plate. Since Central America is a major subduction zone, Nicaragua hosts most of the Central American Volcanic Arc. It is at subduction zones that Earth's lithosphere, oceanic crust, sedimentary layers and some trapped water are recycled into the deep mantle. Not surprisingly, the shallowest portions of subduction zones are known best. Above subduction zones, volcanoes exist in long chains called volcanic arcs. Although the process of subduction as it occurs today is fairly well understood, its origin remains a matter of discussion and continuing study. Yin suggests that meteorite impacts may have contributed to subduction initiation on early Earth. An example of a volcanic arc having both island and continental arc sections is found behind the Aleutian Trench subduction zone in Alaska. The strains caused by plate convergence in subduction zones cause at least three different types of earthquakes. Because earthquakes can occur only when a rock is deforming in a brittle fashion, subduction zones can cause large earthquakes. Anomalously deep events are a characteristic of subduction zones, which produce the deepest quakes on the planet. However, in subduction zones, quakes occur at depths as great as seven hundred kilometers. However, anomalous shallower angles of subduction are known to exist as well some that are extremely steep. An embryonic subduction margin is potentially developing west of Gibraltar. Together these three tectonic forces are slowly developing into a new subduction system in the eastern Atlantic Basin. Water is driven out of the oceanic lithosphere in subduction zones, and it causes melting in the overlying mantle. Hydrous magmas composed of basalt and andesite are produced directly and indirectly as results of dehydration during the subduction process. Show More Sentences Temperature increases also may contribute to the melting of lithosphere dragged down in a subduction zone. This work can also help to explain processes that occur within the Earth, such as subduction and magma chamber evolution. Ongoing accretion at a subduction zone, and the obduction of intact ophiolite slabs, are not considered to be collision. The Ring of Fire is named after the several hundred active volcanoes that sit above the various subduction zones. The Pacific Ocean is the only ocean which is almost totally bounded by subduction zones. A subduction zone on the coast of western North America continues to create the Ancestral Rocky Mountains. These islands arise from volcanoes where the subduction of one plate under another is occurring. While the subduction zones around the Pacific are seismically active, not all earthquakes generate tsunami. Various zones of subduction harbour and form the deepest and most majestic oceanic ridges, east of the Ionian Sea and south of the Aegean. The weakness of the asthenosphere allows the tectonic plates to move easily towards a subduction zone. Geological Survey described the main features of island arc subduction in the Aleutian Islands. Orogenic belts are associated with subduction zones, which consume crust, produce volcanoes, and build island arcs. Water in the mantle is responsible for the melt that produces volcanoes at subduction zones. This subduction zone explains the presence of active volcanoes over the southeastern part of the Caribbean Sea. The location, depth and mechanism of the earthquake are consistent with the event occurring on this subduction zone interface. The destruction of oceanic crust occurs at subduction zones where oceanic crust is forced under either continental crust or oceanic crust. Active margins are found on the edge of a continent where subduction occurs. Basins associated with collision zones and subduction zones are where most of the remaining giant oil fields are found. Large, shallow earthquakes on subduction zone interfaces are the largest types of earthquakes. When buoyant continental crust enters a trench, subduction eventually stops and the area becomes a zone of continental collision. Show More Sentences In the 1970s, the linear deeps of the Hellenic trench south of Crete were thought to be similar to trenches at other subduction zones. Igneous basement of a nonaccretionary forearc may be continuously exposed by subduction erosion. Slab rollback occurs during the subduction of two tectonic plates, and results in seaward motion of the trench. A second order control on trench depth is the age of the lithosphere at the time of subduction. The trench is produced by the subduction of the southernmost portion of the South American Plate beneath the small South Sandwich Plate. The discovery of quite similar trenches on Venus suggests that subduction also occurs there, Schubert and Sandwell assert. Meteoric water is the most likely external source, but how it might be transported to the subduction zones is yet unknown. The earthquake was of type subduction mechanism, where Indian-Australian plate subduct to the Eurasian plate. Here, the Nazca plate plunges beneath the South American plate, forming a subduction zone. In subduction systems, there is an intermediate mantle zone in the overriding plate, located between the wedge and the neighbouring back arc. Water is carried mantle by deep sea fault zones which penetrate the oceanic plate as it bends into the subduction zone. Seismologists do not rule out the potential of the earthquake striking Oman's eastern coast from the Makran subduction zone. Giant earthquakes will more likely occur in subduction zones where one tectonic plate goes under another. The Arabian Plate is surrounded by spreading and subduction zones in the Red Sea and along the Zagros mountains, respectively. Slow slip helps scientists balance the books at subduction zones by explaining where all the motion of the subducting plate goes. They apparently speciated when the vicariant event of subduction of a once continuous ridge occurred. His research interests range from paleomagnetism to tectonic processes in the subduction zones. Furthermore, seismic tomography is being used to identify subducted slabs in the mantle, from which the location of former Panthalassic subduction zones can be derived. This volcanic arc was formed above a subduction zone where the oceanic lithosphere of the Iapetus Ocean subducted southward under other oceanic lithosphere. Sylvester points to the Cascadia subduction zone, a plate boundary that stretches from Vancouver to Northern California, as the cause of these threats. Show More Sentences Accordingly, the Mediterranean basin consists of several stretched tectonic plates in subduction which are the foundation of the Eastern part of the Mediterranean Sea. Lithosphere on the oceanward side of an oceanic trench at a subduction zone will curve upwards due to the elastic properties of the Earth's crust. North America and South America are separate continents, the connecting isthmus being largely the result of volcanism from relatively recent subduction tectonics. This year's program focused on subduction zones, where Earth's tectonic plates bend back down toward the planet's interior, usually creating volcanoes in the process. Such forcing under, as two plates meet, is termed subduction. Some batholiths are mammoth, paralleling past and present subduction zones and other heat sources for hundreds of kilometers in continental crust. Only the Antarctic and Australian coasts have no nearby subduction zones. Archipelagos are often volcanic, forming along island arcs generated by subduction zones or hotspots, but may also be the result of erosion, deposition, and land elevation. The deep sea deposits of the Skiddaw Group were raised above sea level by the subduction of ocean crust from the north beneath the continent to the south. The main cause of the rise of the Andes is the compression of the western rim of the South American Plate due to the subduction of the Nazca Plate and the Antarctic Plate. The eastern boundary is a subduction zone, the Lesser Antilles subduction zone, where oceanic crust of the South American Plate is being subducted under the Caribbean Plate. The arc is formed by continental fragments that once formed a land bridge between South America and Antarctica, once part of the subduction margin that still forms the Andes. The mantle's flow is driven by the descent of cold tectonic plates during subduction and the complementary ascent of plumes of hot material from lower levels. Fluids escaping from the shallowest parts of a subduction zone may also escape along the plate boundary but have rarely been observed draining along the trench axis. This is an oversimplification, because the same section of margin may experience both sediment accretion and subduction erosion throughout its active time span. This material is then carried down into the subduction zone. The proposed land-based subductive waste disposal method disposes of waste in a subduction zone accessed from land, and therefore is not prohibited by international agreement. If the incoming sediment flux is low, material is scraped from the overriding plate by the subducting plate in a process called subduction erosion. Beneath the inner trench wall, the two plates slide past each other along the subduction decollement, the seafloor intersection of which defines the trench location. Major oceanic-tectonic features including transform faults, mid-oceanic ridges and subduction zones are now outlined and labelled for easier reference. Show More Sentences The great seismic discontinuities in the mantle, at 410 and 670 kilometer depth, are disrupted by the descent of cold slabs in deep subduction zones. Outer rise earthquakes occur when normal faults oceanward of the subduction zone are activated by flexture of the plate as it bends into the subduction zone. Anderson has hypothesized that plate tectonics could not happen without the calcium carbonate laid down by bioforms at the edges of subduction zones. Earth is so far the only planet where subduction is known to occur. Regions where this process occurs are known as subduction zones. The subducting plate in a subduction zone is normally oceanic crust, and moves beneath the other plate, which can be made of either oceanic or continental crust. In the context of the Wilson Cycle, this suggests that the beginning of the closure of the Atlantic is taking place in front of the three Atlantic subduction zones. The Puerto Rico Trench is located at a boundary between two plates that pass each other along a transform boundary with only a small component of subduction. Examples from Classical Literature And from hence lastly doth arise the solidity of the section, by addition and subduction. The metamorphism is related not only to overthrusting and the obduction of oceanic crust but also to a subduction zone setting. Find more words! 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What is the opposite of subduction? Words that rhyme with subduction What is the plural of subduction? What is the adverb for subduction? What is the adjective for subduction? What is the noun for subduction? Use our Sentence Generator Nearby Words subducting subducted subduct subdual subdominant subdomain subduction zone subdue subdued subduer subdues subduing 10-letter Words Starting With s su sub subd subdu subduc subduct subducti subductio