Classifying Metamorphic Rocks

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Lineation is the parallel arrangement of minerals within metamorphic rocks ex.Amphibolite

Quartzite and Marble dont align under intense heat

Wet rock is easier to transform than dry rock

Classifying Metamorphic Rocks

WHERE DOES THE PRESSURE COME FROM

Burial Metamorphism

Rocks formed by burial in sedimentary basins with low temperatures and pressure. Results in new minerals

Being buried in the ground gives the rocks their pressure. Pressure increases as depth increases.

TEXTURES OF METAMORPHIC ROCK

NON-FOLIATED/GRANULAR

Can occur from hot intruding igneous rock applying heat WITHOUT adding pressure to a rock Also form from rocks containing minerals that dont align under intense heat

Metamorphic rocks that don't display a sheet structure.

FOLIATED/SHEETLIKE

Sheet-like structure that show what direction pressure was applied.

EXAMPLES OF METAMORPHIC ROCKS

NON-FOLIATED (SCRATCHES GLASS)

Quartzite Hornfels

FOLIATED

Can't Scratch Glass: Slate Phyllite

Can Scratch Glass: Shicst Gneiss

CHEMICAL FLUID

When the solution comes into contact with colder seawater, it causes chemical reactions Called "Contact Metamorphosis"

HYDROTHERMAL SOLUTION(Dissolved ions in hot water) Found along ocean floor.

HOW ARE THE ROCKS HEATED

Rocks can also be heated by the the crust of the Earth Temperature of crust increases by 20-30 C degrees per kilometre

CONTACT METAMORPHISM

Rocks make contact with magma, but are not melted

REGIONAL METAMORPHISM

Molten rock near the rock that heats it up

HOW METAMORPHIC ROCKS FORM

RECRYSTALLIZATION

Recrystallization occurs under intense temperature and pressure where grains, minerals and rock materials are packed closer together. This creates a new crystal structure

Rocks buried deep underground that are subjected to extreme heat and pressure or chemical fluids. They are heated, folded, squashed, stretched out, and put under a lot of pressure.