Term
|
Definition
| mineralogical and textural change in a rock that occurs in the solid state as a result of chaning pressure and/or temperature conditions (and in the presence of volatiles). may exist with partial melting (migmatite) |
|
|
Term
|
Definition
| H2O and CO2 as fluids and/or gas |
|
|
Term
|
Definition
| metamorphic rock with portions of melt in between |
|
|
Term
|
Definition
| metamorphism over increasing P/T conditions |
|
|
Term
|
Definition
reverse metamorphism over decreasing P/T conditions
does not always occur b/c energy is needed to change the chemical arrangement and in decreasing P/T conditions there is usually not enough energy available, even though the minerals are not in equilibrium and would rather change if they could |
|
|
Term
| Limits/Range of Metamorphism |
|
Definition
lower: >100-150 C (just above diagenesis[the formation/lithification of a sed rock])
upper: 600 (felsic) - 800 (mafic) C (just below melting temp)
*this temp range is where migmatites can form as felsic rocks melt butmafic rocks continue to metamorphose |
|
|
Term
|
Definition
transport ions more effectively
overcome kinematic barriers
introduce new chemical components |
|
|
Term
| AL-rich protoliths produce? |
|
Definition
| meta-pelites, chlorite through al-polymorphs grade, shale through gneiss |
|
|
Term
| Mafic parent rocks produce? |
|
Definition
| zeolite (low P/T) through eclogite (high P/T) grade |
|
|
Term
| Ultramafic parent rocks produce? |
|
Definition
| serpentinite and then meta-peridotite as the water is driven out |
|
|
Term
| Calcareous parent rocks produce? |
|
Definition
|
|
Term
| Calcareous parent rocks produce? |
|
Definition
|
|
Term
| Chemographic diagrams show? |
|
Definition
| mineral assemblages at specific P/T |
|
|
Term
| How to plot ternary diagrams |
|
Definition
| minerals plot based on chemical components, assemblages connect with tie lines, rock assemblage exits somewhere on a subfield, usually triangular, between minerals |
|
|
Term
|
Definition
A= Al2O3 +Fe3O3 (-Na2O, -K2O, -CaO) [ex k-spar]
C= CaO - 3P2O5 (assumes all P is used in apatite)
F= FeO + MgO + MnO (this groups mafic minerals together (mostly for mud/meta-seds) |
|
|
Term
|
Definition
A= Al2O3 + Fe3o3 (excluding k-spar and calcite)
K= K2O (means the graph cannot represent plag)
F= FeO + MgO + MnO (groups mafic minerals together) mostly for mud/meta-seds |
|
|
Term
|
Definition
|
|
