Presentation on theme: "Igneous, Sedimentary & Metamorphic Rocks"— Presentation transcript:
1Igneous, Sedimentary & Metamorphic Rocks ...and the Rock CyclePowerPoint Notes created by S. KoziolDate : 9/7/2013 Revised : ?/?/??
2Igneous RocksCompare and contrast intrusive and extrusive igneous rocks.Describe the composition of magmaDiscuss the factors that affect how rocks melt and crystallize.Classify different types and textures of igneous rocks.Recognize the effects of cooling rates on grain sizes of igneous rocks.Describe some uses of igneous rocks.
3Igneous - crystallization Igneous rocks are formed when magma crystallizes.
4LavaLava is magma that flows out onto Earth's surface.
5Melting PointFactors that affect a rock’s melting point include pressure and water content.
6Melting Point - continued As the water content of rock increases, the melting point decreases.
7IntrusiveIgneous rocks that cool slowly beneath Earth’s crust are intrusive.
8Grain-sizeExtrusive rocks, which cool more rapidly than intrusive rocks, are generally more finely grained.
9Coarse-Grained Intrusive igneous rocks form coarse-grained rocks. Diorite is a coarse-grained, intrusive igneous rock that is intermediate in composition between granite and gabbro.
10ExtrusiveIgneous rocks that cool quickly on Earth’s surface are extrusive.Obsidian is an igneous rock that forms when molten rock material cools so rapidly that atoms are unable to arrange themselves into a crystalline structure. Aka volcanic glass
11Igneous Classification Extrusive igneous rocksIntrusive igneous rocksBoth terms describe an igneous rock which is classified based on how it is formed.Coarse-grained igneous rocks that cool slowly beneath Earth’s surface are intrusive igneous rocks.Fine-grained rocks that cool quickly on Earth’s surface are extrusive igneous rocks.
12Composition Classification Igneous rocks are classified as felsic, mafic, and intermediate.
13Main 3Felsic rocks are light-colored, have high silica content, and contain quartz and feldspars.Mafic rocks are dark-colored, have low silica content, and are rich in iron and magnesium.Intermediate rockslie between felsicand mafic rocks insilica and ironcontent.
14Porphyritic textureA rock that has grains of two different sizes has porphyritic texture.
15FelsicFelsic rock is light-colored rock such as granite that has high silica content.Half Dome at Yosemite National Park is composed of granodiorite
16MaficMafic rock is dark-colored rock such as gabbro that is rich in iron and magnesium.
17UltramaficUltramafic rock is rock that is very high in iron and magnesium.Ultramafic pillow-lavas(YOUTUBE Link)
18Bowen’sA model that illustrates the predictable patterns of mineral formation from cooling magma is Bowen's reaction series.
19Ores & GemsValuable ore deposits and gem crystals are often associated with igneous intrusions.
20Kimberlites Kimberlite is course-grained rocks associated with diamonds in igneous outcrops, named after thearea of S. Africa where they were first discovered.
21Sequence the Formation of Sedimentary Rocks. Explain the formation and classification of clastic sediments.Describe features of Sedimentary Rocks.Describe the types of clastic Sedimentary Rocks.Explain how chemical sedimentary rocks form.Describe organic Sedimentary Rocks.Recognize the importance of Sedimentary Rocks.
22SedimentsMuch of Earth’s surface is covered not by solid rock, but by sediments.Actual outcrops are a rare feature.
23Sediments (continued) Sediments arepieces of solidMaterialdeposited onEarth’s surface.
24DepositionDeposition is the process of sediments being laid down on the ground or sinking to the bottom of water.
25LithificationLithification is the physical and chemical processes that compact and transform sediments into sedimentary rocks.
26PermineralizationDuring lithification, parts of an organism are replaced by minerals and turned into rock.
27ErosionLandslides, moving water, wind, and glaciers cause erosion of surface materials.
28Sorted DepositsSorted deposits are characteristic of sediments transported by water and wind.
29Weathering EffectsWeathering of rock produces worn surfaces and rounded corners that are characteristic of some clastic sediment particles.
30Clastic SedimentsClastic sediment particles have worn surfaces and rounded corners.
31BrecciaBreccia sedimentary rock is coarse-grained with angular fragments.
32BeddingThe primary feature of sedimentary rocks is horizontal layering called bedding. (repetitive laying)
33Graded BeddingGraded bedding has the heaviest and coarsest material is on the bottom.
34Graded Bedding (continued) Graded bedding is produce in marine landslides.
35Unsorted BeddingLandslide and glaciers produce unsorted deposition.
36Cross beddingCross bedding is inclined sediment layers that migrate forward across a horizontal surface.
37Ripple MarksOne-way wave actions of wind or water produce asymmetrical ripple marks.
38Dry Land EvidenceThe presence of dry land in past environments allow for the deposition of four-footed animal fossils.
39PorosityPorosity is the percentage of open spaces between grains in a rock.
40Sandstone vs Shale Porosity Sandstone is porous. When its pore spaces are connected to one another, fluids can move through the sandstone, making sandstone layers valuable as underground reservoirs. However, shale has low porosity, meaning that the pore spaces are small. This hinders the movement of fluids.
41EvaporiteEvaporite are layers of chemical sedimentary rocks that form from precipitated minerals.
42Compare & ContrastBoth are sedimentary rocks which are classified by method of formation.Evaporites form when water evaporates from mineral-rich solutions, causing the minerals to precipitate out of the solutions.Conglomerates form from deposits of loose sediments on Earth’s surface.
43LimestoneLimestone is an organic sedimentary rock, and is the most abundant organic sedimentary rock on Earth. It is calcite-rich (CaCO3).
44WeatheringIf weathering did not occur, sedimentary rock would not form. Its absence would likely affect the formation of igneous and metamorphic rock as well.
45Ancient ConditionsSome sedimentary rocks contain sedimentary structures that indicate the location and direction of flow of ancient rivers, the wave or wind direction over lakes and deserts, and ancient shoreline positions.
46Section 3 Metamorphic Rocks & the Rock Cycle Compare and contrast the different types and causes of metamorphism.Distinguish among metamorphic textures.Explain how mineral and compositional changes occur during regional metamorphism.Understand how rocks change from one type to another in the rock cycle.
47Contact MetamorphismContact metamorphism results when rocks come in contact with molten rocks such as those in an igneous intrusion.
48Metamorphic - Foliated Foliated metamorphic rocks are composed of minerals with crystals that have their long axes perpendicular to pressure.
49Nonfoliated metamorphic Nonfoliated metamorphic rocks are composed of minerals that form blocky crystal shapes.
50The metamorphism of limestone results in the formation of marble.
51Foliated vs. Non-foliated Both are textures of metamorphic rocks.Garnet SchistFoliated rocks have distinct banding or layers that formed perpendicular to pressure.QuartziteNonfoliated rocks are crystals with blocky shapes and do not have banding.
52Sedimentary vs. Metamorphic Both are types of rocks classified by method of formation.Sedimentary rocks form when sediments are cemented together.Metamorphic rocks form when high temperature and pressure cause the texture, mineralogy, or chemical composition of a rock to change without melting it.
53Rock cycleThe Rock cycle is the continuous changing and remaking of rocks.
54Rock Cycle Worksheet Rock Cycle Multimedia Assignment