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weathering is what causes scarp recession. In the case of granite in a dissected landscape the dry granite high on a slope remains stable and acts as caprock. Granite below this is more easily weathered and eroded because it has been exposed to moisture and has weathered. This ultimately leads to the steepening of the slope and the collapse of higher slope elements as well as the maintenance of scarps of essentially constant inclination and morphology during backwearing.
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90:. There is evidence that supports this hypothesis when looking at granitic landforms that have sheet fractures. Granite forms deep in the Earth's crust under conditions of high ambient or lithostatic pressure. In order for the granite to be exposed at the Earth's surface a considerable thickness of rock must be eroded. This unloading allows the granite to expand radially and sheet fractures form tangentially to the
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One hypothesis is that granite domes are uplifted blocks. This is the case with some granite domes but the fracture related exfoliation joints are what controls the steep slopes. Another theory that regards isolated bornhardts is that they remain after long-distance scarp recession. Moisture related
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Sheet fractures are arcuate fractures defining slabs of rock that range from 0.5 to 10 meters thick. They normally form in sets parallel to the Earth's surface but may form in convex-upward or concave-upward sets. There are several possible explanations for the formation of sheet fractures. The
77:, or sheet fractures, and form in onionlike patterns that are parallel to the land surface. These sheets of rock peel off the exposed surface and in certain conditions develop domical structures. Additional theories on the origin of granite domes involve scarp-retreat and tectonic uplift.
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most popular hypothesis is that they are the result of expansion and tangential fracturing consequent on erosional offloading or
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Vidal RomanΔ±Μ, J. R; Twidale, C. R (1999-12-01). "Sheet fractures, other stress forms and some engineering implications".
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brings the rock closer to Earth's surface and the pressure from above the rock decreases; as a result the rock
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cool kilometers below the Earth's surface, minerals in the rock crystallize under uniform confining pressure.
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with bare rock exposed over most of the surface. Generally, domical features such as these are known as
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329:. New York, NY: W.H. Freeman and Company Publishers. pp. 81β82.
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Pages displaying wikidata descriptions as a fallback
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Pages displaying wikidata descriptions as a fallback
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Pages displaying wikidata descriptions as a fallback
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Rounded hills of bare granite formed by exfoliation
387:"Bornhardts and Associated Fracture Patterns"
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407:Granite domes of the Cairngorms
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372:10.1016/S0169-555X(99)00070-7
327:Key Concepts in Geomorphology
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325:Bierman, Paul R. (2014).
98:Other theories of origin
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275:Yosemite National Park
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36:Bayanaul National Park
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364:1999Geomo..31...13V
207:Exfoliating granite
253:Looking Glass Rock
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301:Granite Landforms
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282:References
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241:Half Dome
195:Corcovado
170:state of
71:fractures
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179:See also
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172:Georgia
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