When does metamorphism occur?
What does metamorphism include?
Meta. rocks compare to Ig. and Sed. rocks?
Does Metamorphism have a solid/not solid state?
What are these two types of changes? - ANSWERSOccurs at elevated temperature and pressure, typically at the base of mountains
Inclu...
What are these two types of changes? - ANSWERSOccurs at elevated temperature and pressure, typically
at the base of mountains
Includes Recrystallization, making new minerals from original minerals, and sometimes, changes in the
texture of the Parent Rock (protolith).
Metamorphic rocks are organized compared to Igneous and Sedimentary rocks
Metamorphism is a SOLID STATE transformation. No melting!!
How to determine the possible parent rock of a meta rocks? - ANSWERSDetermine the possible PARENT
ROCK of a metamorphic rocks using your estimate of its bulk chemical composition.
How to interpret meta grade and style of metamorphism? - ANSWERSInterpret METAMORPHIC GRADE
and STYLE OF METAMORPHISM from observations of texture, common minerals, and index minerals.
What are the three main types of setting in which metamorphic rocks form? - ANSWERS1. Regional
metamorphism: low to high T and P Foliate
, 2. Contact metamorphism: high T low P Non foliated
3. High pressure/Ultra-high pressure metamorphism
Metamorphic rocks are classified according to their,.... and ...... - ANSWERSMetamorphic rocks are
classified according to their mineralogy and texture
Metamorphic Rock Texture - ANSWERSNON-FOLIATED: composed of interlocking grains that are
approximately the same size. Lack 'stripes' due to homogeneity. If the protolith has no mineral contrast,
you won't see layers
These changes can be Textural (changes in the size or alignment of constituent minerals) and/or
Mineralogical (changes in the mineralogy of the rock)
How to classify non foliated and foliated meta rocks? - ANSWERSCLASSIFY NON-FOLIATED and FOLIATED
metamorphic rocks using observations of texture and mineral assemblage.
FOLIATED: platy or elongate minerals are aligned parallel to one another. Different minerals provide
contrast and 'layering'
Foliated Textures: Slate, phyllite, schist, Gneiss - ANSWERSSlate is weakly metamorphosed, little
organization (Low Grade)
Phyllite has some organization, micas starting to align, will sparkle like glitter. (Low Grade)
Schist has more organization. Minerals starting to transform for higher efficiency. Will sparkle like a disco
ball. Often has accessory minerals. (medium grade0
Metamorphism alters rocks in two different ways: 1) textural changes and 2) mineralogical changes. -
ANSWERS1. Textural Changes: typically involve the coarsening of existing minerals by solid-state
recrystallization. If the rock experiences large stresses during recrystallization, the minerals may become
aligned (foliated) - this is typical of regional metamorphic settings (foliated rocks). If no significant
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