It is the change or alteration in a rock that is caused by the exterior agencies like deep-seated heat and pressure, or intrusion or rock materials.
The change in the character of a rock. Usually as a result of increasing temperature and/or pressure.
The solid-state transformation of pre-existing rock into texturally or mineralogically distinct new rock as the result of high temperature, high pressure, or both.
The process by which conditions within the Earth, below the zone of diagenesis, alter the mineral content, chemical composition, and structure of solid rock without melting it. Igneous, sedimentary, and metamorphic rocks may all undergo metamorphism.
Changes over time, in the composition and structure of rocks caused by pressure and temperature.
Means to change in important ways. In snow, metamorphism is caused by sublimation, vapor transfer, and crystal deformation within the snow.
The process by which one kind of rock transforms into a different kind of rock.
process by which rocks are changed by the agencies of heat and pressure
Alteration of the minerals, textures and composition of a rock caused by exposure to heat, pressure and chemical actions.
Process of changing rocks through application of heat and pressure.
The process of textural and mineralogical change in rock in response to pressure, temperature and strain conditions.
Alteration of the minerals and textures of a rock by changes in temperature and pressure and by a gain or loss of chemical components.
The change or alteration in a rock caused by exterior agencies, such as deep-seated heat and pressure, or intrusion of rock materials.
The chemical and mineralogical alteration of rocks as a result of heat, pressure or other post depositional/intrusion conditions.
as applied to a mountain snowpack, metamorphism refers to changes in snow texture caused by pressure and temperature conditions. The temperature of the snow layer determines the rate of metamorphism, and the temperature change (gradient) across the layer largely determines the type of metamorphism.
Changes in size and shape of snow crystals or grains governed by the internal environment of the snow cover.
change in the structure of rock by natural agencies such as pressure or heat of introduction of new chemical substances
changes in the structure and texture of snow grains which results from variations in temperature, migration of liquid water and water vapor, and pressure within the snow cover
The collective name for all of the various processes that alter pre-existing rock buried within the earth. The changes result from heat, from the pressure of overlying rock, from the pressures related to mountain-building activities, or some combination of these. Alterations that may occur in the pre-existing rock include recrystalization of minerals, formation of new minerals, and rearrangement of crystals or other particles in the rock.
the process of altering rock by pressure and/or heat; alteration may be in texture, composition, or internal structure of the constituent minerals to produce new minerals.
The deformation and recrystallization of pre-existing rocks as a result of high temperature, high compressional stress, or a change in chemical environment.
The mineralogical, chemical, and structural adjustment of solid rocks to physical and chemical conditions which have generally been imposed at depths below the surface zones of weathering and cementation, and which differ from the conditions under which the rocks in question originated. In an older and now more obsolete sense, the scope of the term included katamorphism, i.e. the processes of cementation and weathering.
mineralogical, chemical, or structural changes in rock due to changes in temperature, pressure, or chemical environment, generally at depth.
A pronounced change in the constitution of rock effected by pressure, heat, and water that results in a more compact and more highly crystalline condition.
The process by which rocks are changed by heating and / or squashing. As rocks are buried over millions of years, they are exposed to heat and pressure from the overlying rocks and from movements within the Earth's crust. This causes changes in their properties. The heat can make the minerals which make up the rock recrystallise, often in distinct layers or bands. Metamorphism can occur where two of the rigid crustal plates making the Earth's surface collide, or where a magma rising through the Earth's crust bakes the rocks surrounding it.
n. The process of altering the chemical or mineralogical composition of a rock through different amounts of heat and pressure below the surface of the Earth; metamorphose metamorphic - adj.
Rock of sedimentary or igneous origin that has been altered by high temperature and/or pressure.
physical and chemical process that modifies the mineralogical assemblage of rocks under pressure and temperature increase when buried at depth. Three zones of metamorphism: epizone, mesozone and catazone.
The mineralogical and structural adjustment of solid rocks to physical and chemical conditions that differ from those under which the rocks originally formed.
Altering in composition, texture, or internal structure by processes involving pressure, heat and/or the introduction of new chemical substances;
Process that creates metamorphic rocks.
Changes of temperature, pressure, and chemical environment, below the shells of weathering and cementation.
Metamorphosis require heat, pressure and time and is an extension of lithification, but it can occur on any rocks type (including metamorphic rocks). There is a continuum of type from heat dominated (marble) to pressure dominated ( blueschist). Metamorphism is ranked in terms of a grade. A high grade metamorphic rock is a gneiss, which has undergone intense heat and pressure. It is important to note metamorphism occurs in the solid state - there is no melting. If the rock starts to melt it is called a migmatite (Mixed IGneous and metamorphic rock).
Physical and chemical changes to rocks that occur below the earth's surface. These changes are caused by increased temperature, increased pressure, and the presence of hydrothermal fluids, and result in the growth and reorientation of crystals in the rock. Metamorphism does not include melting - once magma forms, the resulting rock will be igneous.
Metamorphism can be defined as the solid state recrystallisation of pre-existing rocks due to changes in heat and/or pressure and/or introduction of fluids i.e without melting. There will be mineralogical, chemical and crystallographic changes.