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Metamorphic Rocks Pages 141-144 Formed by ______________________ ______________________ _______________________ Caused by __________________ ________________________ __________________ _________________________ ____________________ ___________________________ Change occurs by ___________________________________ Often lose H2O or CO2 Mechanical deformation ____________ minerals are _______________ Two types we will mention _______________________ or Barrovian ________________________ Regional Metamorphism Occurs over___________ areas -state size Cause— ____________________ __________________________ Contact Metamorphism Rocks that are in contact with hot _____________________ or ______________________ often become metamorphosed. The metamorphic rock that develops depends upon the ________________________ rock What is formed from limestone? __________________________ What is formed from quartz sandstone? __________________________ Two Types of meta rx 1. ______________________ 2. _______________________ 1. Foliated rocks Increasing ____________________of metamorphism with increasing heat and pressure Slate-Phyllite-Schist-Gneiss Write the metamorphic rocks in increasing grades of metamorphism. _____________ _______________ ___________ _______________ Increasing heat and pressure What rock would come before slate? ___________________ What kind of rock is it? __________________________ What happens after gneiss? (more heat and pressure) ____________________ What kind of rock is it? After cooling it is _____________________ Slate Very flat--____________________ Used for ____________ ____________ and roofing they can break along ____________ of ___________________ (cleavage) where soft, ___________ minerals like mica and chlorite grow during metamorphism Phyllite ________________, ___________________ surface Schist Flakes of ______________________ visible on surface Often has larger mineral, like garnet __________________ Gneiss _________________ ___________________ of ________________ and ______________________ minerals Minerals align _____________________ to direction of force 2. Non-foliated formed around igneous intrusions where the temperatures are high but the pressures are relatively _____________ and _______________ in all directions (confining pressure). Marble Marble forms from metamorphosed _______________________ _________________________ so it fizzes Uses of Marble Buildings like the Taj Statues Mahal The Pieta— Countertops Michelangelo Tombstones Many old tombstones are made of marble or limestone. Rocks made of calcium carbonate, such as these tombstones, are readily _________________ by rainwater. Marble disintegrates Acid Rain Quartzite Forms from metamorphosed _______________________ Often _____________________ looking Very hard, since it is made from ______________________ The meta rock that develops depends upon the parent rock Metamorphic Rock Lab 1. Separate rocks into foliated and non foliated 2. Arrange foliated rocks by increasing grade of metamorphism I.e.. Slate, phyllite, schist, gneiss 3. Test non-foliated rocks to discover which is marble which is quartzite Hint: marble is metamorphosed limestone (calcite) For each rock test: