Rocks. 3.1 The Rock Cycle. 3.1 The Rock Cycle. 3.1 The Rock Cycle. The Rock Cycle. I. Rocks
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1 Rocks Tarbuck Lutgens 3.1 The Rock Cycle 3.1 The Rock Cycle I. Rocks Rocks are any solid mass of mineral or mineral-like matter occurring naturally as part of our planet. Types of Rocks 1. Igneous rock is formed by the crystallization of molten magma. 2. Sedimentary rock is formed from the weathered products of preexisting rocks that have been transported, deposited, compacted, and cemented. 3. Metamorphic rock is formed by the alteration of pre-existing rock deep within Earth (but still in the solid state) by heat, pressure, and/or chemically active fluids. 3.1 The Rock Cycle The Rock Cycle II. The Rock Cycle Shows the interrelationships among the three rock types (igneous, sedimentary, and metamorphic) Magma is molten material that forms deep beneath the Earth s surface. Lava is magma that reaches the surface. Weathering is a process in which rocks are broken down by water, air, and living things. Sediment is weathered pieces of Earth elements. 1
2 3.1 The Rock Cycle III. Energy That Drives the Rock Cycle Processes driven by heat from the Earth s interior are responsible for forming both igneous rock and metamorphic rock. Weathering and the movement of weathered materials are external processes powered by energy from the sun. External processes produce sedimentary rocks. I. Formation of Igneous Rocks 1. Intrusive igneous rocks are formed when magma hardens beneath Earth s surface. 2. Extrusive igneous rocks are formed when lava hardens. Course-Grained Igneous Texture II. Classification of Igneous Rocks Igneous rocks can be classified based on their composition and texture. 1. Texture Coarse-grained texture is caused by slow cooling resulting in larger crystals. Fine-grained texture is caused by rapid cooling resulting in smaller, interconnected mineral grains. Fine-Grained Igneous Texture (Texture continued) Glassy texture is caused by very rapid cooling. Porphyritic texture is caused by different rates of cooling resulting in varied sized minerals. 2. Composition Granitic composition rocks are made mostly of light-colored quartz and feldspar. 2
3 Obsidian Exhibits a Glassy Texture. Porphyritic Igneous Texture Basalt (Composition continued) Basaltic composition rocks are made mostly of dark-colored silicate minerals and plagioclase feldspar. Andesitic composition rocks are between granitic light-color minerals and basaltic composition dark-colored minerals. Ultramafic composition rocks are made mostly from iron and magnesium-rich minerals. Classification of Igneous Rocks I. Formation of Sedimentary Rocks A. Weathering, Erosion, and Deposition Erosion involves the weathering and the removal of rock. Deposition occurs when an agent of erosion water, wind, ice, or gravity loses energy and drops sediments. 3
4 B. Compaction and Cementation Compaction is a process that squeezes, or compacts, sediments. Cementation takes place when dissolved minerals are deposited in the tiny spaces among the sediments. II. Classification of Sedimentary Rocks Two Main Groups 1. Clastic sedimentary rocks are composed of weathered bits of rocks and minerals. Classified by particle size Common rocks include - Shale (most abundant) - Sandstone - Conglomerate Shale with Plant Fossils Conglomerate Fossiliferous Limestone 2. Chemical sedimentary rocks form when dissolved substances precipitate, or separate, from water. Common rocks include - limestone most abundant chemical rock - microcrystalline quartz known as chert, flint, jasper, or agate - evaporites such as rock salt or gypsum - coal 4
5 Classification of Sedimentary Rocks III. Features of Some Sedimentary Rocks Features of sedimentary rocks are clues to how and where the rocks are formed I. Formation of Metamorphic Rocks Metamorphism means to change form. Most metamorphic changes occur at elevated temperatures and pressures. Conditions for formation are found a few kilometers below the Earth s surface and extend into the upper mantle. A. Contact metamorphism occurs when magma moves into rock. Occurs near a body of magma Changes are driven by a rise in temperature. B. Regional metamorphism results in large-scale deformation and high-grade metamorphism. Directed pressures and high temperatures occur during mountain building. Produces the greatest volume of metamorphic rock II. Agents of Metamorphism A. Heat Provides the energy needed to drive chemical reactions B. Pressure Causes a more compact rock with greater density 5
6 Origin of Pressure in Metamorphism C. Hydrothermal Solutions Hot water-based solutions escaping from the mass of magma Promote recrystallization by dissolving original minerals and then depositing new ones Classification of Metamorphic Rocks III. Classification of Metamorphic Rocks Two main categories 1. Foliated Metamorphic Rock Has a banded or layered appearance 2. Nonfoliated Metamorphic Rock Does not have a banded texture Gneiss Typically Displays a Banded Appearance Marble A Nonfoliated Metamorphic Rock 6
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