Earth Science Chapter 6 Rocks
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1 Earth Science Chapter 6 Rocks
2 I. Rocks and the Rock Cycle * Material that makes up the solid part of the Earth. * Made of a variety of different combinations of minerals and organic matter.
3 A. Three Major Types of Rock 1. Igneous rock formed when magma cools down and hardens. 2. Sedimentary rock formed when sediments are compressed or cemented together and harden. 3. Metamorphic rock formed by changing existing rock through heat, pressure, or chemical action.
4 B. The Rock Cycle Process by which rock is changed from one type to another
5 C. Properties of Rocks 1. Bowen s Reaction Series The order in which minerals crystallize from magma. a. First Way A gradual continuous formation of minerals that have similar composition. b. Second Way A sudden change in mineral types. c. The pattern depends upon the chemical composition of the magma
6 Bowen s Series
7 2. Chemical Stability of Minerals A measure of the tendency of a chemical compound to maintain its original chemical composition. a. Depends upon the strength of the chemical bonds between the atoms. b. Strong bonds between Si and O are crucial.
8 3. Physical Stability of Rocks a. Rocks have natural zones of weakness determined by how and where the rocks were formed. 1. Sedimentary rocks have layers where they break. 2. Metamorphic rocks also have layers. 3. Igneous rocks have zones of weakness called joints.
9 II. Igneous Rock A. The formation of Magma Rock melting under extreme heat and pressure. Determined by chemical composition of the minerals in the magma. 1. Partial Melting different minerals melting at different temperatures.
10 2. Fractional Crystallization
11 B. Texture of Igneous Rock Intrusive Igneous Rock magma that cools deep inside the crust Extrusive Igneous Rock magma that cools on the Earth s surface.
12 1. Coarse-Grained Igneous Rock a. Intrusive b. Slow cooling, large crystals c. granite
13 2. Fine-Grained Igneous Rock a. Extrusive b. Rapid cooling, small crystals c. basalt
14 3. Other Igneous Rock Textures a. Porphyritic 1. combination of slow and rapid cooling. 2. both small and large crystals. Leopardite
15 b. Glassy - 1. Quick cooling, few crystals 2. Contains little gas 3. Obsidian
16 c. Vesicular - 1. quick cooling, few crystals 2. large % of gas 3. Bubbles form, rock has holes 4. Pumice
17 C. Composition of Igneous Rock Determined by the chemical composition of the magma 1. Felsic Rock large proportion of Si
18 2. Mafic Rock low in Si, rich in Fe, Mg
19 3. Intermediate Rock a. Contains Si between Mafic and Felsic.
20 D. Intrusive Igneous Rock Structures Igneous rock structures that form underground 1. Batholith a. Largest of all intrusions b. Spread over 100 km 2 c. Forms cores of many mountain ranges.
21 2. Stock - a. Same as a Batholith but not as large. b. Less than 100 km 2
22 3. Laccoliths - Dome shaped underground magma intrusion. Usually occur in groups.
23 4. Sill - Magma that flows between layers of rock and hardens. Vary in thickness from a few centimeters to hundreds of meters.
24 5. Dikes - Magma that flows through vertical fractures and hardens.
25 E. Extrusive Igneous Rock Structures Igneous rock masses that form on the Earth s Surface 1. Volcanic neck Solidified central vent of an extinct volcano
26 2. Lava Flows Lava Plateau
27 3. Tuff Volcanic Ash Deposits
28 Pompeii
29 III Sedimentary Rock A. Formation of Sedimentary Rock * Sediments form from erosion * Sediment composition determined by source * Sediment is broken down or chemically altered * Sediment is deposited. * Compaction Sediment is squeezed by weight and pressure * Cementation Sediments are glued together by minerals deposited by water.
30 Sedimentary rock
31 Sedimentary Rock
32 1. Chemical Sedimentary Rock Formed from minerals that were once dissolved in water and then precipitated due to the evaporation of the water. How they are formed Calcite When water washes over and through rocks, some of the minerals from the rocks are dissolved and carried in the water. When the water evaporates or the minerals precipitate out of it the chemical sediment (the previously dissolved minerals) are deposited. These sediments go through the same lithification process as detrital sedimentary rocks.
33 2. Organic Sedimentary Rock Forms from the remains of once living things Coal Chalk
34 3. Clastic Sedimentary Rock - Formed from fragments of rock moved from their original source by erosion and deposited in other areas. Classified by the size of the particles in the sediments. a. Conglomerate rounded fragments from sand grains to boulders.
35 b. Sandstone - Sand-sized grains cemented together, fluids and gases can move between the grains.
36 c. Shale - Clay sized particles cemented together into flat layers that easily split apart.
37 Oil shale Oil Shale
38 4. Characteristics of Clastic Sediments a. Sorting 1. separating sediments according to size. 2. result of changes in speed of the agent moving the sediment.
39 b. Angularity - Change in shape of particles as they collide with other particles in their path. 1. Long distance fine and round 2. Short distance larger, rougher.
40 5. Sedimentary Rock Features a. Stratification Layering of Sedimentary Rock 1. caused by changes in deposition conditions. a. Change in sediment type b. Change in physical environment.
41 2. Beds Stratified layers of sediment. Dipping Bed
42 b. Cross-Beds and Graded Bedding 1. Cross-Beds are slanted layers that form within beds. 2. Graded beds are sediments of different sizes being deposited largest on bottom, smallest on top.
43 c. Ripple Marks - Action of wind or water on sand
44 d. Mud cracks - Muddy deposits dry and crack.
45 e. Fossils and concretions 1. Fossils remains or traces of ancient plants and animals. Keichousauris
46 2. Concretion - Lumps of rock in sediments that have a composition different from the main rock body. Precipitation of minerals from fluids around a nucleus. a. Geode minerals deposited inside cavaties in sedimentary rock.
47 III. Metamorphic Rock A. Formation of Metamorphic Rock Heat, pressure, hot fluids cause some minerals to change into other minerals. The amount of heat, pressure and the chemical composition of the rock will determine what combinations of minerals will form.
48 1. Contact Metamorphism Small areas of rock that surround hot magma is changed by the magma s heat.
49 2. Regional Metamorphism - Occurs over a large area during periods of high tectonic activity.
50 B. Classification of Metamorphic Rocks 1. Foliated Rocks Texture in which minerals are arranged in planes or bands. Caused by extreme heat and pressure to minerals that have different composition. slate, schist, gneiss a. shale low heat, low pressure slate b. Slate med heat, med pressure schist c. Schist high heat, high pressure gneiss
51 metamorphic Slate gneiss
52 2. Non-foliated Rock Do not have bands or aligned minerals. a. Composed of one kind of mineral. b. Composed of round or square grains that do not change position. c. marble
53 Quartzite
54 THE END
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