Metamorphic Rocks- Changed Rocks! Existing rocks that are put under HEAT and/or PRESSURE metamorphose (change) Over MILLIONS of years, sedimentary and igneous rocks get heated and put under pressure and change into NEW ROCKS! METAMORPHIC ROCK forms when: Partial melting and recrystallization of minerals in existing rocks!

Metamorphic Rocks: Heat and Pressure The magma heats the rock layers that it touches The lava does the same thing! The heat partially melts the exiting rocks and changed them into new ones.

Metamorphic Rocks- Review ____ and ____ form metamorphic rocks. Either ______ or _________ rocks can be metamorphosed (turned into metamorphic) ___ or ___ can heat existing rocks enough to change them! Under heat and pressure, rocks partially __________ and ____________ Can a metamorphic rock be metamorphosed? Explain…

Metamorphic Rocks: Formation Rock touching the magma gets metamorphosed and is called… Quartzite: Made from sandstone Large crystals in a really hard rock! CONTACT metamorphic rock Crystal enlargement (grow) Rock gets harder

Metamorphic Rocks: Formation Rock that gets buried deep underground and put under HUGE PRESSURE and HEAT is called… REGIONAL metamorphic rock Foliation (layers of crystals form) Banding (color bands of minerals) Crystal enlargement (grow) Rock gets harder GNEISS: Made from granite Foliation and banding!

Metamorphic Rocks- Review ____metamorphic rocks form when lava or magma touches and heats up other rock Contact metamorphism causes rock crystals to _____ and rocks to get______ ______ metamorphic rocks show layers of crystals. Bands of color in rocks is called _______ ____metamorphism happens when rocks are buried under heat and pressure

Metamorphic Rocks: Identification Scheme For Metamorphic Rock Identification Texture Foliated Mineral Alignment means layers form Banding means color bands form Type of Metamorphism Regional- Deep burial, heat and pressure mean Big changes! Examples: Slate, Phyllite, Schist and Gneiss

Metamorphic Rocks: Identification Scheme For Metamorphic Rock Identification Texture Non-Foliated No layering or banding Harder rocks with larger crystals Type of Metamorphism Mostly contact but can be regional Examples: Coal, quartzite, marble, hornfels

Metamorphic Rocks- Review ____is a ____ metamorphic rock that shows banding All foliated metamorphic rocks are formed by ______ metamorphism Most non-foliated metamorphic rocks are formed by ____ metamorphism ___ is a ____ metamorphic rock formed only by contact metamorphism

Metamorphic Rocks: Identification Scheme For Metamorphic Rock Identification Each metamorphic rock comes from a parent rock… Ex: Slate comes from shale Some metamorphic rocks can have several different parent rocks Remember- all metamorphic rocks come from other rocks!

Metamorphic Rocks: Identification Scheme For Metamorphic Rock Identification Low grade metamorphism means minor changes in parent rocks High grade metamorphism means greater changes in parent rocks Both types of metamorphism can be low or high grade!

Metamorphic Rocks- Final Review Metamorphic rocks form when existing rocks are put under ___ and ____ Metamorphic rocks can have __ or __ texture ___ is when layers of minerals form ___ is when stripes or bands of colors form ___ is a high grade metamorphic rock that is foliated with banding ___ is a low grade metamorphic rock with foliation of shale

Metamorphic Rocks- Vocabulary Contact Regional Foliation Banding Non-Foliated Mineral Alignment High Grade Metamorphism Recrystallization Low Grade Metamorphism Heat and Pressure Quartzite Gneiss Marble Slate Hornfels Schist