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
The Shale Family: High-grade
Medium grade large mica crystals, garnet, and feldspar
Schist
The Shale Family: High Grade
High-grade, feldspar, and garnet
Gneiss
The Shale Family: High Grade
Partly melted
Migmatite
The Sandstone Family:
Sandstone (rounded)
Quartzite (interlocking)
(Both pure quartz so looks the same just different texture)
The Limestone Family:
Limestone
Marble
(Both pure calcite but different texture)
Shells disappear
The Peat Family: Low Grade
Wet organic matter parent
Peat
The Peat Family: Low Grade
Low grade, soft brown coal
Lignite
The Peat Family: Low grade
Low grade petroleum
Oil & Gas
The Peal Family: High Grade
Medium-grade, oily-looking
Bituminous Coal
The Peat Family: High Grade
High grade very shiny
Anthracite
The Peat Family: High Grade
Pure carbon
Graphite
