Metamorphism Processes/ Products Flashcards

1
Q

A low temperature, brittle grain-fracturing process that involves grain size reduction through the mechanical grinding, rotation and crushing of rock.

A

Cataclasis

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2
Q

A fine-grained, non- foliated, clastic metamorphic rock produced by cataclastic processes.

A

Cataclasite

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3
Q

A ductile grain reduction
process that produces oriented grains of smaller diameter

A

Mylonitization

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4
Q

A product of mylonitization characterized by grain size reduction via macroscopic scale cataclisis, plastic stretching and thinning associated with ductile deformation.

A

Mylonite

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5
Q

Occurs in metamorphic rocks
where individual atoms or molecules can migrate in gaseous, liquid or solid phases from one location in a rock body to a new location.

A

Diffusion

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6
Q

Involves the dissolution of solid grains under high compressive stress conditions.

A

Pressolution

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7
Q

An insoluble seam that accumulates as soluble minerals dissolve.

A

Stylolite

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8
Q

Occurs when existing minerals are transformed under higher temperature and/or pressure conditions, without experiencing a significant change in chemical composition.

A

Recrystallization

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9
Q

The nucleation and growth of new minerals as pre-existing minerals become unstable due to temperature or pressure changes.

A

Neocrystallization

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10
Q

Newly formed minerals that are distinctly larger than the minerals in the surrounding matrix.

A

Porphyroblasts

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11
Q

The segregation of minerals in an initially homogenous rock due to different physical or chemical characteristics such as solubility, ductility, mineral growth, or crystallization temperature.

A

Differentiation

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12
Q

Partially melted rocks that form by quenching under high strain rates in shear zone fractures.

A

Pseudotachylites

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13
Q

A metamorphic halo in the contact zone that surrounds it, produced from the heat of the igneous intrusion, and can range from centimeters to hundreds of meters in diameter.

A

Aureole

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