User:Ekgeo/sandbox
From Wikipedia, the free encyclopedia
Folds occur when one or a stack of planar surfaces such as: bedding, clivage or layering are bent as a result of permanent plastic and continuous deformation. Folds range in size from microscopic crinkles to mountain-sized folds, they occur singly as isolated folds and in extensive fold trains commonly as part of a fold belt in orogenic process.
This is a user sandbox of Ekgeo. You can use it for testing or practicing edits. This is not the sandbox where you should draft your assigned article for a dashboard.wikiedu.org course. To find the right sandbox for your assignment, visit your Dashboard course page and follow the Sandbox Draft link for your assigned article in the My Articles section. |
Folds
Folds form under varied conditions of stress, hydrostatic pressure, pore pressure, and temperature gradient, as evidenced by their presence in unlitified sediments, the full spectrum of metamorphic rocks, and even as primary flow structures in some igneous rocks. Folds are commonly formed by shortening of existing layers parallel to the layering of rocks, but may also be formed by differential compaction, soil liquefaction triggered by seismic activity, due to the effects of a high-level igneous intrusion or diapiric intrusions, impact of meteorites, and as a result of displacement on a non-planar fault (fault bend fold), at the tip of a propagating fault (fault propagation fold).