| 词汇 | continental-crust |
| 释义 | continental crust noun[ U ] geology specializeduk /ˌkɒn.tɪ.nen.təl ˈkrʌst/ us /ˌkɑːn.t̬ən.en.t̬əl ˈkrʌst/ the surface of the earth that is about 35 kilometres thick and includes the land masses and the solid rock below them地壳（地球的表层，约35公里厚，由大陆块及其下面的岩石组成） TUMEGGY/SCIENCE PHOTO LIBRARY/Science Photo Library/GettyImages Geology - general words Anthropocene anticline apophysis auriferous biozone carboniferous continental plate geologically geomorphic gully erosion henge Holocene Permian petrographic petrographically petrography petrological Precambrian rockfall syncline Examples of continental crustcontinental crust Mixing calculations illustrate the possible effects of bulk assimilation of continentalcrust. The derivation from or contamination with crustal material explains the observed similarity of the multi-element patterns to typical upper continentalcrust. It is therefore likely that generation of the widespread intermediate-silicic magmas represents an early stage in the formation of continentalcrust. This finding has important implications for the growth of the continentalcrust. The larger modelled upper continentalcrust component is also consistent with the relative abundance of detrital mica of possible extra-basinal origin. This is in agreement with return to more mafic detritus and the proposed increased upper continentalcrust contribution, together at the expense of felsic detritus. Inevitably then, over the course of time, the volume of continentalcrust builds up. The origin and accretionary history of the continentalcrust has long been debated by earth scientists. Unshaded areas enclosed by solid lines are submerged continentalcrust. One of these sources must be in the mantle and the other(s) in the continentalcrust. The data confirm the interpretation of partial melting of, or considerable contamination by, old continentalcrust during magma generation and evolution. This controls the way the continentalcrust responds to plate collision, earthquakes and aseismic slip in subduction zones, and mantle convection. The partial melting conditions are similar to those assumed when basaltic continentalcrust partially melts to form active margin batholiths. Cooling and contamination of mafic and ultramafic magmas during ascent through continentalcrust. The crustal component could be provided by partial melting at the base of continentalcrust or by contamination of more mafic magma with crustal material. See all examples of continental crust 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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