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Metamorphic Rock Rocks that have changed their-structure, texture, or composition Rocks were changed due to heat, pressure or a combination Origins of Metamorphic Rock • When surroundings of rock change so will the rock • Temperature is between 50-1000C, rocks melt • Metamorphic rock also need pressure and depth to change • Earth crust moving helps create this pressure besides the depth Contact Metamorphism • When magma moves through earth layers, it heats rocks around it-may cause some of them to change • Pg. 107- Figure 2 Regional Metamorphism • When pressure builds up or crust collide • Happens deep in the Earth Composition of Meta. Rock • Index minerals- are minerals that change at certain temperatures and pressures – Ex- biotite mica, chlorite, garnet, kyanite, muscovite mica, sillimantie, and staurolite Texture of Meta. Rock • Foliated – Mineral grains are arranged in planes or bands – Ex. Slate—phyllite—schist---gneiss (this all happens when more heat and pressure is added) • Nonfoliated – Mineral grains are NOT arranged in planes/bands – Crystals-can change the size or minerals its made off= recrystallization • Ex. Quartzite- is shiny, glittery appearance – Crystals have gotten larger – Limestone can due this and become Marble Metamorphic Rock Structures • Deformations – Change in the shape of a rock caused by force placed on it – Usually see it squeezed, stretched, fold, or bends THE END
