metamorphism$48324$ - ορισμός. Τι είναι το metamorphism$48324$
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Τι (ποιος) είναι metamorphism$48324$ - ορισμός

CHANGE OF MINERALS IN ROCKS WITHOUT MELTING INTO MAGMA, OCCURRING DUE TO HEAT, PRESSURE, AND CHEMICALLY ACTIVE FLUIDS
Metamorphism (geology); Contact metamorphism; Hydrothermal metamorphism; Regional metamorphism; Contact Metamorphism; Thermal metamorphism; Metamorphosis (geology); Metamorphic aureole; Dynamothermal metamorphism; Metamorphic grade; Retrograde metamorphism; Diaphthoresis; Contact metamorphic; Prograde metamorphism; Neocrystallization; Dynamic metamorphism; Dynamical metamorphism; Contact aureole; Burial metamorphism
  •  ACF [[compatibility diagram]]s (aluminium-calcium-iron) showing phase equilibria in metamorphic mafic rocks at different P-T circumstances (metamorphic facies). Dots represent mineral phases, thin grey lines are equilibria between two phases. Mineral abbreviations: act = [[actinolite]]; cc = [[calcite]]; chl = [[chlorite]]; di = [[diopside]]; ep = [[epidote]]; glau = [[glaucophane]]; gt = [[garnet]]; hbl = [[hornblende]]; ky = [[kyanite]]; law = [[lawsonite]]; plag = [[plagioclase]]; om = [[omphacite]]; opx = [[orthopyroxene]]; zo = [[zoisite]]
  • Amphibolite formed by metamorphism of basalt showing coarse texture
  • Basalt hand sample showing fine texture
  • Temperatures and pressures of metamorphic facies
  • stress]] if a rock is subjected to stress during metamorphism
  • A mylonite (through a [[petrographic microscope]])
  • Petrogenetic grid showing aluminium silicate-muscovite-quartz-K feldspar phase boundaries
  • thumbnail
  • Sioux Quartzite, a product of burial metamorphism
  • A metamorphic rock, deformed during the [[Variscan orogeny]], at [[Vall de Cardós]], [[Lérida]], [[Spain]]
  • cross-polarized]] [[thin section]] image of a [[garnet]]-[[mica]]-[[schist]] from [[Salangen]], Norway showing the strong strain fabric of schists. The black crystal is garnet, the pink-orange-yellow  colored strands are [[muscovite]] mica, and the brown crystals are [[biotite]] mica. The grey and white crystals are [[quartz]] and (limited) [[feldspar]].

Shock metamorphism         
  • impact melt rock]] from the [[Suvasvesi]] South impact structure, Finland (thin section [[photomicrograph]], plane polarized light).
  • dolomite]] from the [[Wells Creek crater]], USA.
DESCRIBES THE EFFECTS OF SHOCK-WAVE RELATED DEFORMATION AND HEATING DURING IMPACT EVENTS
Impact metamorphism
Shock metamorphism or impact metamorphism describes the effects of shock-wave related deformation and heating during impact events.
Metamorphism         
·noun The state or quality of being metamorphic; the process by which the material of rock masses has been more or less recrystallized by heat, pressure, ·etc., as in the change of sedimentary limestone to marble.
Ultra-high-pressure metamorphism         
Ultrahigh-pressure metamorphism
Ultra-high-pressure metamorphism refers to metamorphic processes at pressures high enough to stabilize coesite, the high-pressure polymorph of SiO2. It is important because the processes that form and exhume ultra-high-pressure (UHP) metamorphic rocks may strongly affect plate tectonics, the composition and evolution of Earth's crust.

Βικιπαίδεια

Metamorphism

Metamorphism is the transformation of existing rock (the protolith) to rock with a different mineral composition or texture. Metamorphism takes place at temperatures in excess of 150 to 200 °C (300 to 400 °F), and often also at elevated pressure or in the presence of chemically active fluids, but the rock remains mostly solid during the transformation. Metamorphism is distinct from weathering or diagenesis, which are changes that take place at or just beneath Earth's surface.

Various forms of metamorphism exist, including regional, contact, hydrothermal, shock, and dynamic metamorphism. These differ in the characteristic temperatures, pressures, and rate at which they take place and in the extent to which reactive fluids are involved. Metamorphism occurring at increasing pressure and temperature conditions is known as prograde metamorphism, while decreasing temperature and pressure characterize retrograde metamorphism.

Metamorphic petrology is the study of metamorphism. Metamorphic petrologists rely heavily on statistical mechanics and experimental petrology to understand metamorphic processes.