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Definition
Most widespread, high temperate & high pressure over large parts of the crust
Convergent plate boundaries |
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Definition
| Formed from high pressure and moderate temperature on magic volcanic rocks to shaley sedimentary rocks |
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Definition
| Change in texture/composition due to pressure, temperature (short of melting), and catalytic hydrothermal water |
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Definition
Reflects the temperature & pressure a rock was subjected to
(High vs Low) |
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Definition
| Transported back to the surface; link between tectonic & climate systems |
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Definition
AKA Pressure
Confining pressure - equally in all directions
Directed pressure - force exerted in a particular direction, causes foliation |
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Term
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Definition
change in a rock's composition by fluid transport of chemical substances (that are soluble by heated water) in/out
Catalytic |
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Definition
Affects a thin zone of country rock immediately around an igneous intrusion, localized
High heat
Form aureoles of metamorphism |
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Definition
Set of flat or wavy parallel cleavage planes from directed pressure
Formed from mudstone/shale into slate
Metamorphism forms minerals with platy crystal habit that have preferred orientation: will align parallel to foliation
Platy elongate crystal shapes
Classified according to: Grade, grain size, foliation type, & banding |
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Term
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Definition
Slate - Phyllite - Schist - Gneiss - Migmatite
(with increasing grade) |
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Term
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Definition
nonfoliated, equant crystals
Contact metamorphism without directed pressure, so no foliation |
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Term
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Definition
| Hornfels, Quartzites, Marble, Greenstones, Amphibolites, Granulite |
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Term
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Definition
Large meta crystals in finer-grained matrix
Contact & regional
Stable over broad range of press & temp, replace parts of the matrix
Garnet & staurolite |
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Term
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Definition
| Boundaries between metamorphic zones as indicated by index minerals (form under certain temp/press range) |
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Term
| Metamorphic facie: Rock types |
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Definition
Zeolite - low temp & press, top of subd. zone
Hornfels - low press & varying temp, cont meta
Blueschist - low-mod temp & mod press, subd zone
Greenschist - mod temp & press, beneath mt belts
Amphibolite - mod-high temp, mod press, beginning of partial melting
Granulite - high temp & mod press, between part melt & cont met
Eclogite - mod temp, very high press, beneath mt belts |
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Term
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Definition
groupings of rocks of various mineral compositions formed under particular conditions of temp & pressure from different parent rocks
tells you the grades |
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Term
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Definition
Unique history of pressure & temperature changes in a rock's mineralogy & texture
Prograde Path & Retrograde Path |
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