Term
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Definition
| The solid-state re-crystallization that involves no melt phase. |
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Term
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Definition
| The protolith of a metamorphic rock |
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Term
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Definition
| Refers to the way minerals in a rock are arranged |
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Term
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Definition
| Defined by the plane or planar arrangement of minerals. |
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Term
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Definition
| Platy minerals are sheet silicates that define a foliation. These include chlorite, muscovite, and biotite. |
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Term
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Definition
| Produced by directed pressure during metamorphism. |
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Term
| Closed or Isochemical Rock Systems |
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Definition
| When elements do not enter or leave a rock during recrystallization. |
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Term
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Definition
| A metamorphic rock composed of coarse-grained calcite. |
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Term
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Definition
| A metamorphic tock composed of a dence network of interlocking quartz. |
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Term
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Definition
| Occurs when basalts are metamorphosed at temperatures of ~500 degrees C or higher. |
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Term
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Definition
| Characterized by a tendency to break into even-parallel sheets due to the parallel alignment of the flat crystal faces of chlorite and muscovite. |
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Term
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Definition
| The foliation in a slate. |
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Term
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Definition
The transformation to a slate occurs at ~300 degrees C.
The transformation to schist occurs at temperatures between ~400-500 degrees C. |
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Term
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Definition
Coarser grained than slates.
When held up to the sunlight they exhibit a marked sheen, as rays of light reflect off the aligned crystals of chlorite and muscovite. |
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Term
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Definition
| The resulting filiation of a mudstone protolith being transformed to schist. |
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Term
| Describe schist derived from a mudstone |
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Definition
| Schist derived from a mudstone at temperatures between about 500 degrees C and 650 degrees C will consist of quartz, feldspar, muscovite, biotite, garnet and staurolite. Such a rock would be coarser grained than phyllite. |
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Term
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Definition
| The coarsest grained metamorphic rock. |
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Term
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Definition
| A foliation in gneiss. It forms as ions migrate over microscopic distances at temperatures above 600-650 degrees C. |
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Term
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Definition
Reffer to the relative temperature conditions under which rocks were metamorphosed.
Dependent upon the geotherm. |
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Term
| Low/High metamotphic grade rocks in geotherms |
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Definition
| Low metamorphic grade rocks occur in the upper part of the crust, while higher grade rocks occur at the deeper levels. |
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Term
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Definition
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Term
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Definition
Curves or surfaces of equal temperature.
Bend downward within subduction zone settings, NOT volcanic arc settings. |
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Term
| Contact metamorphic aureole |
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Definition
| Envelope of recrystallized rock surrounding a pluton. |
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Term
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Definition
Non-foliated rocks found in contact metamorphic aureoles.
Form during contact metamorphism. |
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Term
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Definition
| Depict the PT conditions under which various minerals are stable. |
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Term
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Definition
| Low pressure phase relative to kyanite. |
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Term
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Definition
| High temperature phase relative to andalusite. |
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Term
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Definition
A. Kyanite
B. Sillimanite
C.Andalusite |
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Term
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Definition
| Geotherm is 10 degrees C/km |
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Term
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Definition
| Represents rocks that were metamorphosed under the highest pressure conditions. |
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Term
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Definition
| Represents rocks that were metamorphosed under the lowest PT conditions. |
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Term
| Geotherm in collisional zones and active regions |
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Definition
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Term
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Definition
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Term
| Why do isotherms bow upward in island arcs and mid-ocean ridges? |
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Definition
| Because hot magma is introduced in these regions. |
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