What is cataclastic flow?
Cataclastic flow: The macroscopically ductile movement of rock resulting from microscopically brittle fracturing and sliding. Cataclastic flows display complex transitions in rheology but can sometimes be approximated as viscous fluids. Clast: Fragments of rock surrounded by a finer-grained matrix.
What is cataclastic metamorphism?
Cataclastic Metamorphism: A high-pressure metamorphism resulting from the crushing and shearing of rock during tectonic movement, mostly along faults. Cataclastic metamorphism is generally localized along fault planes (areas of detachment where rocks slide past one another).
What is cataclastic deformation?
Cataclastic flow is the main deformation mechanism accommodating large strains above the brittle-ductile transition zone. Deformation is accommodated by the sliding and rolling of fragments within the cataclastic rock. Cycles of cementation and refracturing are generally recognised in such rocks.
What’s the difference between Cataclasite and mylonite?
Cataclasites are different from mylonites, another type of fault rock, that is classified by the presence of a schistosity formed through ductile deformation methods. Although cataclasites often lack an oriented fabric, some cataclasites are foliated.
What is cataclastic texture?
Definition of cataclastic 1 : of, relating to, or caused by cataclasis a pronounced cataclastic texture. 2 : having the granular fragmental texture induced in rocks by mechanical crushing cataclastic structures.
How does cataclastic metamorphism occur?
Cataclastic metamorphism occurs as a result of mechanical deformation, like when two bodies of rock slide past one another along a fault zone. Heat is generated by the friction of sliding along such a shear zone, and the rocks tend to be mechanically deformed, being crushed and pulverized, due to the shearing.
How does Cataclastic metamorphism occur?
What is Cataclastic texture?
What is Granulose structure?
Explanation: Granulose structure is a typical structure of metamorphic rocks like marble and quartzite and is characterized by an essentially granular character of the constituent minerals.
What causes Metasomatism?
In the metamorphic environment, metasomatism is created by mass transfer from a volume of metamorphic rock at higher stress and temperature into a zone with lower stress and temperature, with metamorphic hydrothermal solutions acting as a solvent.
Where does contact metamorphism occur?
igneous intrusive rock
Contact metamorphism occurs in the vicinity of an igneous intrusive rock as a result of thermal effects of the hot magma.
What is contact and regional metamorphism?
Contact metamorphism is a type of metamorphism where rock minerals and texture are changed, mainly by heat, due to contact with magma. Regional metamorphism is a type of metamorphism where rock minerals and texture are changed by heat and pressure over a wide area or region.
Is cataclastic flow ductile?
Cataclastic flow. It can be regarded as a ductile mechanism, although one that takes place within the elastico-frictional regime of deformation. Deformation is accommodated by the sliding and rolling of fragments within the cataclastic rock. Cycles of cementation and refracturing are generally recognised in such rocks.
How does cataclastic flow affect frictional sliding?
The cataclastic flow associated with the develop- ment of a gouge zone above a certain pressure is found to be one of the factors that stabilizes frictional sliding along experimental fault zones (e.g. Engelder et al. 1975, Logan 1978).
What is cataclasis in geology?
Cataclasis involves the granulation, crushing, or milling of the original rock, then rigid-body rotation and translation of mineral grains or aggregates before lithification. Cataclastic rocks are associated with fault zones and impact event breccias.
How are Cataclastic rocks formed?
Cataclastic rocks form by brittle processes in the upper part of the crust in areas of moderate to high strain, particularly in fault zones. The two main mechanisms involved are microfracturing (breaking the original rock into fragments) and frictional sliding/rolling of the fragments, combined with further fracturing.