METAMORPHIC Flashcards
It is the force applied to a rock.
stress
Metamorphism begins at what temperature?
150-200 °C
Metamorphic minerals that form only under metamorphic temperatures and pressures
Mineral Assemblage
A chemical and mineral composition alteration of rocks by reactions with
hydrothermal fluids.
Metasomatism
This path indicates decreasing temperatures and pressures as rock is carried towards the Earth’s surface.
Retrograde
A mixture of igneous rock and relict of metamorphic rock
Migmatite
Textural change to a pre-existing “parent rock” or protolith
Metamophism
Repetitive layering due to preferred mineral orientation.
Foliation
The increase in temperature with increasing depth in Earth’s interior.
Geothermal Gradient
A part of Metamorphic processes where formation of new metamorphic mineral crystals
Neocrystallization
It is a metamorphic process that change in grain shape and size only
Recrystallization
Force applied in a particular direction (shearing)
Differential Stress
Are non-foliated metamorphic rocks
Granoblastic
Force applied equally in all directions (compression).
Confining Stress
Dark and light layers of colored minerals
Compositional Banding
Preferred orientation of large mica-flakes.
Schistosity
Distinctive arrangements of mineral grains not found in other rock types.
Metamorphic Texture
Plays a critical role in determining which minerals occur within a metamorphic rock.
Temperature
Alter a rock’s composition, mineralogy, and texture by packs atoms tightly
resulting to denser minerals
Role of Pressure / Pressure
Alters by introducing or removing chemical components that are soluble in heated water.
Role of Hydrothermal Fluids / Hydrothermal Fluids
it refers to the degree of metamorphic change a rock has undergone, which
correlates with changes in mental composition and textures as pressure and temperature increases.
metamorphic grade
Mineral grains dissolve producing ions that migrate then precipitate elsewhere.
pressure solution
One mineral which transforms to another mineral with the same composition but
different crystal structure.
phase change
A type of foliation where it has strong foliation which allows it to split into thin sheets.
slaty cleavage
Compositionally layered rock with alternating dark and light-colored minerals
Gneiss
