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Definition
| The changes that occur to a rock within the Earth's interior |
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Definition
| A rock with altered texture and/or mineral assembly due to metamorphism |
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| The original rock before it underwent metamorphism |
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| Capable of being bent and molded |
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| Four factors controlling the characteristics of metamorphic rocks |
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Definition
(1) Composition of parent rock
(2) Temperature and pressure during metamorphism
(3) Effects of tectonics
(4) Effects of fluids (such as water) |
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Definition
| Temperature of a rock versus a given depth |
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Definition
| A mineral is stable if it does not react with another substance or convert to another mineral over time |
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| Pressure applied equally on all surfaces of a substance as a result of burial or submergence |
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| Hydrostatic versus lithostatic pressure |
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Definition
| Pressure at water depth versus pressure at depth of burial, respectfully |
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Definition
| Force per unit area on an object |
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| Shear is stress parallel to the planes of an object while compressive stress is perpendicular inward |
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Definition
Metamorphic rocks created through shear stress during faulting (tectonic movements)
Example: mylonite (formed from pulverized rock in a fault zone) |
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| Refers to a rock with a planar texture, such as shale |
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A pervasive, parallel foliation (layering) of fine-grained platy minerals in a direction perpendicular to the direction of maximum stress
Ex: slate and phyllite |
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Definition
| The layering in a coarse grained, crystalline rock due to the parallel arrangement of platy mineral grains, such as muscovite and biotite |
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Term
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Definition
| The layering in a rock in which bands or lenses of granular minerals (quartz and feldspar) alternate with bands or lenses in which platy (mica) or elongate (amphibole) minerals predominate |
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| Effect of water on metamorphism |
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Definition
| Water moves between grains under high pressure, dissolves ions from one mineral, and carries those ions to a second mineral |
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Definition
| A foliated schistose rock formed under a particular pressure and temperature, which exhibits visible platy or elongate parallel-oriented minerals
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Definition
| Metamorphism in which high temperature is the dominant factor (usually less than 10 km below surface with relatively low lithostatic pressures). "Baking" of country rock adjacent to an intrusive contact |
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Definition
| Zone in which contact-metamorphism occurs |
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Definition
| Lithostatic pressure is the main driving force of metamorphism (deeper than 5 km). Usually produces foliated metamorphic rocks |
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Definition
| Used to determine the pressure and temperature combination under which a rock recrystallized |
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Definition
| A mixed igneous and metamorphic rock located at the threshold between fully igneous and fully metamorphic |
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