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Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Aeolian landform – Landforms produced by action of the winds include: . Dry lake – Area that contained a standing surface water body; Sandhill – Type of ecological community or xeric wildfire-maintained ecosystem
Diastrophism is the process of deformation of the Earth's crust which involves folding and faulting. Diastrophism can be considered part of geotectonics. The word is derived from the Greek διαστροϕή diastrophḗ 'distortion, dislocation'. [1]
Mountain formation occurs due to a variety of geological processes associated with large-scale movements of the Earth's crust (tectonic plates). [1] Folding, faulting, volcanic activity, igneous intrusion and metamorphism can all be parts of the orogenic process of mountain building. [2]
If the axial surface is planar, it is called an axial plane and can be described in terms of strike and dip. Folds can have a fold axis . A fold axis "is the closest approximation to a straight line that when moved parallel to itself, generates the form of the fold". [ 2 ] (
Orogeny (/ ɒ ˈ r ɒ dʒ ə n i /) is a mountain-building process that takes place at a convergent plate margin when plate motion compresses the margin. An orogenic belt or orogen develops as the compressed plate crumples and is uplifted to form one or more mountain ranges. This involves a series of geological processes collectively called ...
The erosional hole is called a window or fenster. The klippe is the isolated block of the nappe overlying autochthonous material. In geology , a nappe or thrust sheet is a large sheetlike body of rock that has been moved more than 2 km (1.2 mi) [ 1 ] or 5 km (3.1 mi) [ 2 ] [ 3 ] above a thrust fault from its original position.
Scree in the lower part of the Mai Valley on the Aurouze mountain (Hautes-Alpes, France) Scree formation is commonly attributed to the formation of ice within mountain rock slopes. The presence of joints, fractures, and other heterogeneities in the rock wall can allow precipitation, groundwater, and surface runoff to flow through the rock. If ...