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