Roza dikesView on map:46.047269°N 117.237613°W
The dikes along Rattlesnake grade are nearly vertical here and several are exposed along the road cut. The Roza Member (Wanapum Basalt) dikes are intruding the Grande Ronde Basalt and are the product of the Roza vent system. Stop 7 in Reidel et al.
A dike or dyke, in geological usage, is a sheet of rock that formed in a fracture in a pre-existing rock body. Dikes can be either magmatic or sedimentary in origin. Magmatic dikes form when magma intrudes into a crack then crystallizes as a sheet intrusion, either cutting across layers of rock or through an unlayered mass of rock. Clastic dikes are formed when sediment fills a pre-existing crack.
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- http://en.wikipedia.org/wiki/Dike (geology)
- Page 143 - Reidel, S. P., et al., 2016, The Columbia River Basalt Group of western Idaho and eastern Washington - Dikes, vents, flows, and tectonics along the eastern margin of the flood basalt province: Geol. Soc. Am. Fied Trip 41, p. 127- 150.
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