Metamorphic Rocks Flashcards
Change in shape in which any rock type can be cooked by changes in pressure and temperature
Metamorphism
Minerals that form at the surface…
Change the most
This messages how “cooked” the rock got
Metamorphic Grade
Low grade =
Low P&T
Medium grade =
Moderate P&T
High-grade =
Very high P&T
Sedimentary Parent rocks:
Shale
Sandstone
Limestone
Peat
Sedimentary Parent rock: SHALE
Unstable (wet) clay)
Sedimentary Parent rock: SANDSTONE
Stable quartz
Sedimentary Parent rock: LIMESTONE
Stable calcite
Sedimentary Parent rock: PEAT
Unstable organics
The Shale Family: Minerals
Low grade:
Mica: Chlorite
The Shale Family: Minerals
Medium to high-grade
Feldspar: kyanite, and garnet
The Shale Family: low grade
A very low grade, clay, and mica
Slate
The Shale Family: Low grade
Low-grade small mica crystals
Phyllite