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单词 craton
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Examples ofcraton

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We therefore assumed that these maxima delineate the border of thecraton.
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A miogeosyncline is the nonvolcanic portion of an orthogeosyncline, located adjacent acraton.
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These inclusions have densities consistent withcratoncomposition and are composed of mantle material residual from high degrees of partial melt.
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Cratonperidotite moisture content is unusually low, which leads to much greater strength.
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What is left of these first small continents are called cratons.
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The thermal activity was caused by excessive mantle heat that had built up below thecraton, insulated by the lithosphere.
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The cratons are of significant importance in terms of mineral resources, with major deposits of gold, antimony, iron, chromium and nickel.
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The mantle lithosphere under these cratons is particularly thick (up to 200 km or more) and cool.
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There are many microcontinents, or continental fragments, that are built of continental crust but do not contain acraton.
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Diamond-bearing volcanic pipes are closely related to the oldest, coolest regions of continental crust (cratons).
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All of these cratons are bounded by younger fold belts formed between 2.0 billion and 300 million years ago.
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Peridotites are important for understanding the deep composition and origin of cratons because peridotite nodules are pieces of mantle rock modified by partial melting.
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Since then, many alternative reconstructions have been proposed for the configuration of the cratons in this supercontinent.
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This is because cratons are very thick, and their lithospheric mantle extends to great enough depth that diamonds are stable.
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They define the boundaries between the belt and the adjacent cratons and separate internal zones within the belt.
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The cratons were surrounded by extensive delta systems and lagoons, and carbonate sedimentation on the surrounding continental platforms, covered by shallow seas.
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Around this terrane some areas of extension happened on the maincraton, creating several basins up to 2 km deep.
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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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更新时间:2024/12/28 10:34:14