METAMORPHIC ROCKS By: Franco Gaite geotripperimages.com

met·a·mor·phic rocks  1 of three rock types  Rock undergone transformation  Densest rock type  Early 19 th century  meta + morphē + ic the-eo-scene.blogspot.com

meta·mor·phism Clipartpanda.com  Transformation of rock nature M  Pressure, heat & water IS OR

Parent rock  A.K.A. protolith  Any of the three types  Original un-metamorphosed rock  Bulk Chemical Composition a. P and T reached during metamorphosis b. Composition of fluid phase present c. The bulk chemical composition Physicalgeography.net

METAMORPHIC GRADE Geosci.ipfw.edu

Low grade  Low pressure and temperature  Takes place between 200° C to 320° C  Characterized by abundance of hydrous minerals. Sodahead.com metamorphism

High grade  Takes place somewhere higher than 320° C  Grade increases = less hydrous minerals  Mineral recrystallization accidentlydelish.com metamorphism

Contact metamorphism  Rocks around magma bodies  May or may not be accompanied by deformation  Caused by heat transfer from intruded magma youtube.com

Regional metamorphism  Large area (mountain ranges)  Orogeny  Convergent zones  Intense heat and pressure prezi.com

Heat  200° C  Transformed using available elements and compounds  600° C to 1,200° C  Geothermal gradient ( T D )  Rising magma as a source of energy breathcast.com

Geothermal gradient  Noun  Increasing T & P with increasing depth

Pressure  Weight of overlying objects  Reorientation of mineral crystals  Tectonic processes can affect leblogdumanagementdeprojet..com Confining pressure ( P D )

Water  Found in small amounts along with CO 2  Between pores & crystals  ENHANCES metamorphism  Dissolves ions by chemical reactions  Creates new minerals from chemical ions Uncle-grandpa.wikia.com

Foliated rocks  Mineral alignment or banding  Regional-Intense Pressure  Increasing metamorphic grade = intensity of foliation increases  At higher grade, the rocks are coarser grained

1) Shale 2) Slate 3) Phyllite 4) Schist 5) Gneiss TEMPERATURE & PRESSURE

Slate  Dark gray or red  Breaks into thin flat layers  Roofing and floor tiles Wikipedia.org

Phyllite  Layers aren’t flat  Wave-like pattern  Silky appearance virtualmicroscope.org

Schist  Distinct sparkle  Mica crystals  Garnet crystals or staurolite crystals = bumpy surface Wikipedia.org

Gneiss  Highly metamorphosed  Almost a granite  Lenses of feldspar  Ribon-like pattern squarespace.com

Non-foliated  Form through Contact metamorphism  Dependent on the precursor’s composition  Identified on the basis of composition  No mineral alignment  Monomineralic

Marble  Metamorphosed limestone  Recrystallized  Color & texture  White to Pink to Brown and Black ebay.com

Quartzite  Metamorphosed sandstone  Grains are tightly cemented  If quartzite is broken in half, It also cuts the individual sand grains geology.about.com

Serpentine  Olivine  Pyroxene  Light green to dark green  Veins and fractures earthphysicsteaching.homestead.com

Hornfel  Dark shale  Siltstone  Basalt  Light gray to dark black wikimedia.com

RESEARCH REFERENCES    grade+meta&aqs=chrome.2.0j69i57j0l4.6383j0j7&sourceid=chrome&es_sm =93&ie=UTF-8  rocks.htm   book/NKCS-6th-Grade-Science-Rocks-Minerals/section/5.0/   

PICTURE REFERENCES           

 hhttp://   Group.html  vous/webinars/page/2/  possible-powerhouse-partners-for-pf-chris-bosh-22868/    

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