Dike (geology)
Geology, Diapir, Intrusion, Sediment, Aspect ratio, Tectonics, Mackenzie dike swarm
978-613-7-34671-6
6137346714
108
2011-10-09
39.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A dike or dyke in geology is a type of sheet intrusion referring to any geologic body that cuts discordantly across planar wall rock structures, such as bedding or foliation massive rock formations, like igneous/magmatic intrusions and salt diapirs. Dikes can therefore be either intrusive or sedimentary in origin. An intrusive dike is an igneous body with a very high aspect ratio, which means that its thickness is usually much smaller than the other two dimensions. Thickness can vary from sub-centimetre scale to many metres, and the lateral dimensions can extend over many kilometres. A dike is an intrusion into an opening cross-cutting fissure, shouldering aside other pre-existing layers or bodies of rock; this implies that a dike is always younger than the rocks that contain it. Dikes are usually high angle to near vertical in orientation, but subsequent tectonic deformation may rotate the sequence of strata through which the dike propagates so that the latter becomes horizontal. Near horizontal, or conformable intrusions, along bedding planes between strata are called intrusive sills.
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Mineralogy,petrography
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