| 词汇 | asthenosphere |
| 释义 | asthenosphere noun geology specializeduk /æsˈθiː.nə.sfɪər/ us /æsˈθiː.nə.sfɪr/ the asthenosphere [ S ] the thin, almost liquid, layer under the hard rock that forms the outer layer of the earth: 软流圈 Molten material only forms a small proportion of the asthenosphere. The asthenosphere forms the inner part of the upper mantle. Compare the atmosphere biosphere exosphere hydrosphere ionosphere lithosphere mesosphere stratosphere thermosphere troposphere Related word asthenospheric Below the lithosphere lies the asthenosphere. The lithosphere essentially floats on the asthenosphere. The asthenosphere behaves like a superheated material that is in a semi-fluidic, plastic-like state. Geology: types of rock agglomerate arenaceous arenite asthenospheric basaltic emery flinty gneiss intrusive lahar limestone lodestone magma marcasite marl marmoreal mudstone obsidian sandstone schist asthenosphere | American Dictionaryasthenosphere noun[ U ] us/ˌæsˈθi·nəˌsfɪər/ earth science the thin, almost liquid, layer under the hard rock that forms the outer layer of the earth Examples of asthenosphereasthenosphere In continental rift settings, the emplacement of such large volumes of felsic melts requires a huge amount of mafic magma derived from uprising asthenosphere. Either of these mechanisms can cause the hot asthenosphere to rise close to the metasomatized lithosphere, initiating melting. In particular, is the source of within-plate basaltic magmas in an extensional setting the lithosphere, convecting asthenosphere or both? The extension of lithosphere accompanied with the upwelling of asthenosphere may be the key factor for the coeval magmas with different sources. We therefore favour the model whereby the eclogitic lower crust, together with the underlying lithospheric mantle, was delaminated, accompanied by asthenosphere upwelling. However, the contribution of asthenosphere to the generation of mafic magmatism would become ever greater along with the increase in extension of the lithosphere. The second chapter discusses the lithosphere and asthenosphere and the important role water plays in defining the brittle and ductile behaviour of the rocks in these regions. Temperatures high enough to produce basaltic partial melt in this decaying thermal anomaly would be located near the base of the lithosphere and in the immediately underlying asthenosphere. Several explanations have been proposed; a lower limit to the pliable asthenosphere, a phase transition, and most plausibly, depth-variation in the shear wave anisotropy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It was found that the asthenosphere had invaded the overlying lithosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Beneath the lithosphere is the asthenosphere, a relatively low-viscosity layer on which the lithosphere rides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The upwelling of asthenosphere is not involved in the actual rifting process. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The upward flow of the asthenosphere results in decompression melting, magmatic underplating and some volcanism that may occur in the rift area. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This decreasing in seismic waves velocity from lithosphere to asthenosphere could be caused by the presence of small percentage of melt in the asthenosphere. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The steep dip angle of the subducting plate can correspond to a thicker wedge of asthenosphere and therefore a greater source of fertile mantle material. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. See all examples of asthenosphere 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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