Es 14e lecture_ch03
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Transcript of Es 14e lecture_ch03
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Rocks: Materials of the Solid Earth
Chapter 3 Lecture
Jennifer ManganJames Madison University
Earth ScienceFourteenth Edition, Global Edition
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• Shows the interrelationships among the three rock types
• Earth as a system: the rock cycle – Magma
• Crystallization– Igneous rock
• Weathering, transportation, and deposition
Rock Cycle
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• Earth as a system: the rock cycle – Sediment
• Lithification – Sedimentary rock
• Metamorphism – Metamorphic rock
• Melting– Magma
Rock Cycle
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• Earth as a system: the rock cycle – Full cycle does not always take place due to “shortcuts” or
interruptions • e.g., Sedimentary rock melts • e.g., Igneous rock is metamorphosed • e.g., Sedimentary rock is weathered • e.g., Metamorphic rock weathers
Rock Cycle
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The Rock Cycle
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• Form as magma cools and crystallizes – Rocks formed inside Earth are called plutonic or intrusive
rocks – Rocks formed on the surface
• Formed from lava (a material similar to magma, but without gas
• Called volcanic or extrusive rocks
Igneous Rocks
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• Crystallization of magma – Ions are arranged into orderly patterns – Crystal size is determined by the rate of cooling
• Slow rate forms large crystals • Fast rate forms microscopic crystals • Very fast rate forms glass
Igneous Rocks
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• Classification is based on the rock’s texture and mineral constituents – Texture
• Size and arrangement of crystals
Igneous Rocks
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• Types of igneous textures– Fine-grained – fast rate of cooling– Coarse-grained – slow rate of cooling – Porphyritic (two crystal sizes) – two rates of cooling – Glassy – very fast rate of cooling– Vesicular – contains hole left by gas bubbles– Pyroclastic – fragmented; produced by consolidation of
volcanic fragments
Igneous Rocks
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Fine-Grained Igneous Texture
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Coarse-Grained Igneous Texture
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Porphyritic Igneous Texture
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Glassy Igneous Texture
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Vesicular Igneous Texture
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Pyroclastic Igneous Texture
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• Classification is based on the rock’s texture and mineral constituents – Mineral composition
• Explained by Bowen’s reaction series which shows the order of mineral crystallization
• Influenced by crystal settling in the magma
Igneous Rocks
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Bowen’s Reaction Series
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Classification of Igneous Rocks
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• Naming igneous rocks – Granitic rocks
• Composed almost entirely of light-colored silicates – quartz and feldspar
• Also referred to as felsic: feldspar and silica (quartz)• High silica content (about 70 percent) • Common rock is granite
Igneous Rocks
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Granite and Granitic Rock
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• Naming igneous rocks – Basaltic rocks
• Contain substantial dark silicate minerals and calcium-rich plagioclase feldspar
• Also referred to as mafic: magnesium and ferrum (iron) • Common rock is basalt
Igneous Rocks
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Basaltic Lava
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• Naming igneous rocks – Other compositional groups
• Andesitic (or intermediate) • Ultramafic
Igneous Rocks
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• Form from sediment (weathered products)• About 75 percent of all rock outcrops on the continents• Used to reconstruct much of Earth’s history
– Clues to past environments – Provide information about sediment transport – Rocks often contain fossils
Sedimentary Rocks
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• Economic importance – Coal– Petroleum and natural gas – Sources of iron and aluminum
Sedimentary Rocks
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• Classifying sedimentary rocks – Two groups based on the source of the material
• Detrital• Chemical
Sedimentary Rocks
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• Detrital rocks – Material is solid particles– Classified by particle size – Common rocks include
• Shale (most abundant) • Sandstone• Conglomerate
Sedimentary Rocks
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Detrital Sedimentary Rocks
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• Chemical sedimentary rocks – Derived from material that was once in solution and
precipitates to form sediment • Directly precipitated as the result of physical processes, or • Through life processes (biochemical origin)
Sedimentary Rocks
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• Common chemical sedimentary rocks – Limestone – the most abundant chemical rock – Microcrystalline quartz (precipitated quartz) known as chert,
flint, jasper, or agate – Evaporites such as rock salt or gypsum– Coal – compressed plant material
Sedimentary Rocks
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Chemical, Biochemical, and Organic Sedimentary Rocks
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• Sedimentary rocks are produced through lithification – Loose sediments are transformed into solid rock – Lithification processes
• Compaction• Cementation by
– Calcite– Silica– Iron Oxide
Sedimentary Rocks
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• Features of sedimentary rocks– Strata, or beds (most characteristic)– Bedding planes separate strata – Fossils
• Traces or remains of prehistoric life • Are the most important inclusions • Help determine past environments • Used as time indicators • Used for matching rocks from different places
Sedimentary Rocks
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• “Changed form” rocks • Produced from preexisting
– Igneous rocks– Sedimentary rocks– Other metamorphic rocks
Metamorphic Rocks
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• Metamorphism – Takes place where preexisting rock is subjected to
temperatures and pressures unlike those in which it formed – Degrees of metamorphism
• Exhibited by rock texture and mineralogy• Low-grade (e.g., shale becomes slate) • High-grade (obliteration of original features)
Metamorphic Rocks
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Metamorphic Grade
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• Metamorphic settings – Contact, or thermal, metamorphism
• Occurs near a body of magma• Changes are driven by a rise in temperature
– Regional metamorphism• Directed pressures and high temperatures during mountain
building • Produces the greatest volume of metamorphic rock
Metamorphic Rocks
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• Metamorphic agents– Heat– Pressure (stress)
• Confining pressure – from burial • Differential stress – occurs during mountain building
– Chemically active fluids • Mainly water and other volatiles • Promote recrystallization by enhancing ion migration
Metamorphic Rocks
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Confining Pressure and Differential Stress
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• Metamorphic textures – Foliated texture
• Minerals are in a parallel alignment • Minerals are perpendicular to the compressional force
– Nonfoliated texture • Contain equidimensional crystals • Resembles a coarse-grained igneous rock
Metamorphic Rocks
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Development of Foliation due to Directed Pressure
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• Common metamorphic rocks – Foliated rocks
• Slate – Fine-grained– Splits easily
• Schist – Strongly foliated – “Platy” – Types based on composition (e.g., mica schist)
Metamorphic Rocks
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Common Metamorphic Rocks
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• Common metamorphic rocks – Foliated rocks
• Gneiss – Strong segregation of silicate minerals – “Banded” texture
– Nonfoliated rocks• Marble
– Parent rock is limestone – Large, interlocking calcite crystals
Metamorphic Rocks
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• Common metamorphic rocks – Nonfoliated rocks
• Marble – Used as a building stone – Variety of colors
• Quartzite – Parent rock – quartz sandstone– Quartz grains are fused
Metamorphic Rocks
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• Metallic mineral resources – Gold, silver, copper, mercury, lead, etc. – Concentrations of desirable materials are produced by
• Igneous processes • Metamorphic processes
Resources from Rocks and Minerals
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• Metallic mineral resources – Most important ore deposits are generated from
hydrothermal (hot-water) solutions • Hot• Contain metal-rich fluids• Associated with cooling magma bodies
Resources from Rocks and Minerals
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Resources from Rocks and Minerals
• Pegmatites – Result from crystallization in fluid-rich environment– Unusually large crystals
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Resources from Rocks and Minerals
• Types of deposits include – Vein deposits in fractures or bedding planes, and – Disseminated deposits which are distributed throughout
the rock
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Metallic Resources
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• Nonmetallic mineral resources – Make use of the material’s
• Nonmetallic elements • Physical or chemical properties
– Two broad groups • Building materials (e.g., limestone, gypsum) • Industrial minerals (e.g., fluorite, corundum, sylvite)
Resources from Rocks and Minerals
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Energy Resources: Fossil Fuels
• Coal – Burns energy stored by plants millions of years ago– Air pollution– Surface scarring
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• Oil and Natural Gas– More than 60% of U.S.-consumed energy– Remains of marine plants and animals– Source rock – where oil and natural gas originate– Oil trap – geologic environment allowing oil and gas to
accumulate
Energy Resources: Fossil Fuels
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• Oil trap – two basic features– Reservoir rock
• Porous and permeable• Yields oil and gas in significant quantities
– Cap rock• Impermeable• Keeps oil and gas from surface escape
Energy Resources: Fossil Fuels
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• Common oil and natural gas traps– Anticline – up-arched sedimentary strata– Fault trap – displaced strata– Salt dome – includes layers of rock salt– Stratigraphic (pinchout) trap – original sedimentation pattern
Energy Resources: Fossil Fuels
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Common Oil Traps
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• Hydraulic Fracturing– “Fracking”– Shatters shale with significant gas and petroleum reserves– Pumping liquids into rock at very high pressure– Can include toxic chemicals
Energy Resources: Fossil Fuels