metamorphic rocks section 4-3. metamorphic rocks rocks that have changed due to heat and pressure ...
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Metamorphic Rocks
Section 4-3
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Metamorphic Rocks
Rocks that have changed due to heat and pressure
Banding effect – causes the minerals to become squashed in lined or banded (foliated) forming a gneiss.
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2 ways gneiss is formed
Flattening due to pressure from above
Stretching due to pulling along fault lines
Flattened rock with foliation versus stretched rock with
lineation. Illustration by Anne Crowder.
Foliation
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Notice banding of mineralsNotice bending of bands due to
folding pressure
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Causes of heat and pressure
Heat – 1. Radioactive decay 2. Contact with magma
pools
Pressure 1. Overlying rock 2. Plate boundaries
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Formation of Metamorphic rocks
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Classification of Metamorphic Rocks
Foliated Rocks – minerals are flattened and line up in parallel bands
Ex. Gneiss – forms from granite
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Slate – forms from shale
- minerals so tightly packed water cannot pass through
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Careful on this pronunciation. There’s an “s” before the “t”.
Schist – layering of minerals
Ex. Mica schist
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Metamorphic rocks that are not banded. (nonfoliated)
Nonfoliated rocks – no banding occurs
- mineral grains change, grow and rearrange
Ex sandstone (mostly quartz) – forms quartzite.
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Marble – formed from limestone
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Marble
Calcite – give it a shiny appearance
Hornblende and serpentine – give it its greenish tint
Hematite – give it is reddish tint
Used in statues
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Textbook page 102answer in notebook
Self check – 2,3,4 Applying skills