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Download Chapter 5 Metamorphic Rocks Notes
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Transcript
3/1/2013 METAMORPHIC ROCKS METAMORPHIC ROCKS CHAPTER 5 • Form when rocks that already exist are changed by heat, pressure, hot water, and gases at great depths into new kinds of rocks • “Metamorphism” = “change in form” • Form 2 ways: • 1. Regional metamorphism • 2. Contact metamorphism EARTH SCI ENCE 1 1 1. REGIONAL METAMORPHISM • Large area undergo metamorphism as in mountain building • Limestone marble • Sandstone quartzite • Shale Slate Phyllite Schist Gneiss 2. CONTACT METAMORPHISM • When hot magma intrudes the surrounding solid rock (“country rock”) • The increased temperature causes localized metamorphism • Small Crystals ------------------------Large Crystals COMMON METAMORPHIC ROCKS • 2 types: Foliated & Non-foliated FOLIATED • Ability to split rock along layers (usually mica) • Mud Shale Slate Phyllite Schist Gneiss Magma 1 3/1/2013 NON-FOLIATED • Quartzite: • Formation: metamorphosed quartz sandstone • Colour: white, grey, reddish • Texture: medium grained (looks sugary) • H=7 • Marble: • • • • • Formation: metamorphosed limestone Colour: white, yellow, green, red, or black Texture: medium to fine grained HCl test: mild reaction Other: may show plastic flow, H=3/4 2
