| 词汇 | example_english_oceanic-crust |
| 释义 | Examples of oceanic crustThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. This, combined with the young age of the oceaniccrust, explains why few craters are likely to be found in the oceans. The detached amphibolitized oceaniccrust may then return to shallow depths as a result of its positive buoyancy against the denser surrounding mantle. The basement is thought to be oceaniccrust, generated either at a mid-ocean ridge or by back-arc spreading dependent on the favoured model. The progressive contraction of oceaniccrust caused the uplift of previously rifted continental margin and platforms and the formation of foredeep flysch basins. Recycling of hydrated basalt of the oceaniccrust and growth of early continents. Fortunately, some portions of oceaniccrust are occasionally preserved as ophiolites. The progressive contraction of oceaniccrust caused the uplift of previously rifted continental margin and platforms, and formation of foredeep flysch basins. The majority of the oceaniccrust formed today is created at intermediate- to fast-spreading ocean ridges. This book contains a wealth of new data and new thinking on the whole problem of ophiolites and oceaniccrust and upper mantle. The students, whilst acknowledging excellent texts in igneous petrology or igneous geochemistry, felt the lack of a multi-disciplinary text specifically covering the generation and evolution of the oceaniccrust. Bioalteration of basaltic glass in the oceaniccrust. These pressures are equivalent to 57-46 km depth beneath an oceaniccrust-mantle hanging-wall, a much greater thickness than can be accounted for by the thickness of the ophiolite. Partial melting of subducting oceaniccrust. The evidence of hornblende crystallization implies that the ultramafites and associated gabbros were emplaced at depth in a crust considerably thicker than typical oceaniccrust as represented by ophiolites. The oceaniccrust as a bioreactor. Transform faults are not limited to oceaniccrust and spreading centers; many transform faults are located on continental margins. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A few deep drill holes into oceaniccrust have intercepted gabbro, but it is not layered like ophiolite gabbro. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In detail there are problems, with many ophiolites exhibiting thinner accumulations of igneous rock than are inferred for oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The subducting oceaniccrust is thought to split from the continental margin to aid subduction. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These differences result from processes that occur during the subduction of oceaniccrust and mantle lithosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The combination of these processes continually recycles the oceaniccrust back into the mantle. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is not, however, principally of volcanic origin, being instead mainly oceaniccrust that has been lifted by the plate collision. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A large continental block existed with oceaniccrust subducting underneath it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The subduction process consumes older oceanic lithosphere, so oceaniccrust is seldom more than 200 million years old. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Consequently, most oceaniccrust is subducted easily at an oceanic trench. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oceaniccrust is thin (6 km thick) and dense (about 3.3 g/cm), consisting of basalt, gabbro, and peridotite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They include oceanic sediments (e.g. radiolarites, turbidites) and oceaniccrust (e.g. basalt, pillow lava). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Because young volcanic crust is relatively hotter and less dense than old oceaniccrust, the ocean floors rise during such periods. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During periods when continents move apart, more oceaniccrust is formed by volcanic activity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Although originally attributed to a melting of subducted oceaniccrust, recent evidence belies this connection. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Geologically, an ocean is an area of oceaniccrust covered by water. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oceaniccrust has a smaller amount of silicon (mafic rock). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. At a depth of approximately 80120 kilometres, the basalt of the oceaniccrust is converted to a metamorphic rock called eclogite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Over time this production of normal oceaniccrust and sea floor spreading leads to the formation of an ocean. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Earth is the only known solar planet with bimodal hypsography expressed as different kinds of crust, oceaniccrust and continental crust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This was impossible: oceaniccrust is both more dense and more rigid than continental crust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The destruction of oceaniccrust occurs at subduction zones where oceaniccrust is forced under either continental crust or oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oceaniccrust is also denser than continental crust owing to their different compositions. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Plates include both oceaniccrust and continental crust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Volcanic beds cover the transition from thinned continental crust to oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When the oceaniccrust is subducted and metamorphosed, it is close to its melting point and a slight increase in temperature may cause melting. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It has formed as part of the oceaniccrust and mantle was buckled upwards. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This anomaly can be used to locate the boundary between transitional crust and oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Archaean greenstone belts are hypothesized to have been formed from passive margin oceaniccrust that became part of an extensive subduction-undercut margin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Manganese is much rarer than iron in oceaniccrust, but is much easier for bacteria to extract from the igneous glass. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oceaniccrust has a layered velocity structure that implies a layered rock series similar to that listed above. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Another problem relating oceaniccrust and ophiolites is that the thick gabbro layer of ophiolites calls for large magma chambers beneath mid-ocean ridges. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, oceaniccrust is still at the surface between the promontories, not having been subducted beneath the island arc yet. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This resulted in oceaniccrust, being more dense than the mantle, descending into the lithosphere very quickly, and steeply beneath the edge of the continent. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Hot spots in oceaniccrust develop different magmatic plumbing systems based on plate velocities. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Upper mantle and oceaniccrust are exposed along this bank. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The volcano subsides into the oceaniccrust due to its immense weight and loses elevation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. As oceaniccrust and underlying lithosphere subduct, water is released by dehydration reactions, along with water-soluble elements and trace elements. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. At that time, the fabrication of dacitic magma was more ubiquitous due to the availability of young hot oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Weakening and cracking of oceaniccrust and upper mantle is likely to occur in the tensional regime. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Above and behind the subduction zone, a welt of oceaniccrust and mantle rides up over the descending plate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Additionally, continental crustal material is transferred to oceaniccrust by sedimentation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The schist, slates and greywackes originated from sedimentation, probably above the oceaniccrust of a passive continental margin for more than 400 mya. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The faulted crust transitions into oceaniccrust and may be deeply buried due to thermal subsidence and the mass of sediment that collects above it. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The magmatic zone was formed by subduction of oceaniccrust along a pre-existing continental margin, creating a continental volcanic arc. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This bulge is thought to be caused by upward convective forces in the asthenosphere pushing the oceaniccrust and lithosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The continents record four billion years of geologic history, while the oceaniccrust gets recycled about every 180 million years. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, it is thought that it was basaltic in composition, like today's oceaniccrust, because little crustal differentiation had yet taken place. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This developed as oceaniccrust to the (present) north-west and was forced by crustal movement under a continental land-mass to the present south-east. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. New oceaniccrust moves away from the spreading center. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Later terranes docked on the periphery of continental masses with geosynclines developing between the fused nuclei and oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The transition from continental to oceaniccrust commonly occurs within the outer part of the margin, called continental rise. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is covered with 20006000 m of sediment overlying an oceaniccrust which is 1214 km thick. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The denser plate, made of oceaniccrust, is subducted underneath the less dense plate, which can be either continental or oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. After the oceaniccrust is consumed, the two blocks meet and the subducting oceaniccrust pulls the attached continental block under the other. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This is the only place on the planet where such a triple junction in oceaniccrust is exposed subaerially. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The oceaniccrust is 99% basalt, which is an igneous rock of mafic composition. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most seamounts are volcanic in origin, and thus tend to be found on oceaniccrust near mid-ocean ridges, mantle plumes, and island arcs. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. B enrichment in seawater relative to both oceaniccrust and continental crust; this difference may act as an isotopic signature. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Transitional crust welds continental crust to oceaniccrust along the lines of continental break-up. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Magma development under continental crust develops a different type of volcano than magmas that are generated under oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The formation of dacite provides a great deal of information about the connection between oceaniccrust and continental crust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All continental crust ultimately derives from the fractional differentiation of oceaniccrust over many eons. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They also found that the oceaniccrust was much thinner than continental crust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The oceaniccrust of the sheet is different from its continental crust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During subduction, the subducted oceaniccrust is submitted to increasing pressure and temperature, leading to metamorphism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The simple shear detachment became a deactivated detachment fault once this rifting process began the formation of new oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Variations in their composition are explained by partial mixing with melted oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oceaniccrust attached to a continental margin subducts beneath an island arc. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The study concluded that oceanic and ophiolitic velocity structures were identical, pointing to the origin of ophiolite complexes as oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Thus, it became widely accepted that ophiolites represent oceaniccrust that had been emplaced on land. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Magma was formed from underthrusting oceaniccrust under compression about 25 km deep. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Beneath the wedge are several seismic layers within the oceaniccrust. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Upper mantle and oceaniccrust are exposed along this ridge. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Oceaniccrust is also part of tectonic plates, but it is denser than continental lithosphere, so it floats low on the mantle. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. For convergence to continue, it should do so at a new subduction zone where oceaniccrust can be consumed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. After this, the asthenosphere penetrated to the surface, a mid-oceanic ridge formed and normal oceaniccrust was formed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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