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Boudin on the Island of Uto, Stockholm Archipelago, Sweden Chocolate-tablet boudinage structures in a low grade metasedimentary rock outcropping in Deception Pass, Washington. Boudinage is a geological term for structures formed by extension, where a rigid tabular body such as hornfels, is stretched and deformed amidst less competent ...
This page is intended to be a list of rock textural and morphological terms. A. Adcumulate; Agglomeritic ... Boudinage; boudins; C. Cataclastic; Chilled margin ...
Boudinage of a relatively competent metabasic sheet within quartzofeldspathic gneiss. In geology, competence refers to the degree of resistance of rocks to deformation or flow. [1] In mining, 'competent rocks' are those in which an unsupported opening can be made. [2] More competent rock weathers slower than less competent rock.
In geology, texture or rock microstructure [1] refers to the relationship between the materials of which a rock is composed. [2] The broadest textural classes are crystalline (in which the components are intergrown and interlocking crystals), fragmental (in which there is an accumulation of fragments by some physical process), aphanitic (in which crystals are not visible to the unaided eye ...
The Boudinage experiments [3] show that localized plasticity is observed in certain rock specimens that have failed in shear. Other examples of rock displaying plasticity can be seen in the work of Cheatham and Gnirk. [4] Test using compression and tension show necking of rock specimens while tests using wedge penetration show lip
The continental crust on the downgoing plate is deeply subducted as part of the downgoing plate during collision, defined as buoyant crust entering a subduction zone. An unknown proportion of subducted continental crust returns to the surface as ultra-high pressure (UHP) metamorphic terranes, which contain metamorphic coesite and/or diamond plus or minus unusual silicon-rich garnets and/or ...
The most dramatic orogenic belt on the planet is the one between the African plate and the Indo-Australian plate on one side (to the south) and the Eurasian plate on the other side (to the north).
Mylonite is a fine-grained, compact metamorphic rock produced by dynamic recrystallization of the constituent minerals resulting in a reduction of the grain size of the rock. Mylonites can have many different mineralogical compositions; it is a classification based on the textural appearance of the rock.