Why do Dykes cool faster than plutons?
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A dike or dyke, in geological usage, is a sheet of rock that is formed in a fracture of a pre-existing rock body. Dikes can be either magmatic or sedimentary in origin. Magmatic dikes form when magma flows into a crack then solidifies as a sheet intrusion, either cutting across layers of rock or through a contiguous mass of rock. Clastic dikes are formed when sediment fills a pre-existing crack
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In most cases, a body of hot magma is less dense than the rock surrounding it, so it has . Large irregular-shaped plutons are called either stocks or batholiths. cooled more quickly than in the centre of the dyke, so the texture is finer .
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