Chapter 4a - Igneous Rocks

Chapter 4a - Igneous Rocks - Understanding Earth Sixth...

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Unformatted text preview: Understanding Earth Sixth Edition Chapter 4: IGNEOUS ROCKS Solids from Melts 2011 by W. H. Freeman and Company Grotzinger Jordan Chapter 4: Chapter 4: Igneous Igneous Rocks: Rocks: Solids from Solids from Melts Melts About Igneous Rocks About Igneous Rocks Igneous rocks form from liquid rock Igneous rocks form from liquid rock (magma) in several different ways. (magma) in several different ways. Igneous processes within the Earth Igneous processes within the Earth produce intrusive igneous rocks. produce intrusive igneous rocks. Igneous processes on or near Earths Igneous processes on or near Earths surface produce extrusive igneous rocks. surface produce extrusive igneous rocks. Lecture Outline Lecture Outline 1. 1. How do igneous rocks differ from one How do igneous rocks differ from one another? another? 2. How do magmas form? 2. How do magmas form? 3. Magmatic differentiation 3. Magmatic differentiation 4. Forms of igneous intrusions 4. Forms of igneous intrusions 5. Igneous processes and plate tectonics 5. Igneous processes and plate tectonics 1. How Do Igneous Rocks Differ How Do Igneous Rocks Differ from One Another? from One Another? Texture size of crystals Texture size of crystals Coarse-grained rocks (phaneritic) Coarse-grained rocks (phaneritic) Fine-grained rocks (aphanitic) Fine-grained rocks (aphanitic) Mixed texture rocks (pophryritic) Mixed texture rocks (pophryritic) 1. How Do Igneous Rocks Differ How Do Igneous Rocks Differ from One Another? from One Another? 1. How Do Igneous Rocks Differ How Do Igneous Rocks Differ from One Another? from One Another? Clues about significance of texture Clues about significance of texture Early studies of volcanic rocks Early studies of volcanic rocks Laboratory crystallization studies Laboratory crystallization studies Studies of slow cooling in granite Studies of slow cooling in granite 1. How Do Igneous Rocks Differ How Do Igneous Rocks Differ from One Another? from One Another? Texture is related to rate of cooling. Texture is related to rate of cooling. Intrusive igneous rocks Intrusive igneous rocks Extrusive igneous rocks Extrusive igneous rocks 1. How Do Igneous Rocks Differ How Do Igneous Rocks Differ from One Another? from One Another? Intrusive rocks Porphyry Pyroclasts Extrusive rocks Igneous Textures Igneous Textures Intrusive rocks Porphyry Pyroclasts Extrusive rocks Volcanic ash Bomb Pumice Intrusive rocks Porphyry Pyroclasts Extrusive rocks Volcanic ash Bomb Pumice Extrusive pyroclasts form in violent eruptions from lava in the air. Intrusive rocks Porphyry Pyroclasts Extrusive rocks Volcanic ash Bomb Pumice Mafic Felsic Basalt Rhyolite Extrusive pyroclasts form in violent eruptions from lava in the air. Intrusive rocks Porphyry Pyroclasts Extrusive rocks Volcanic ash Bomb Pumice Extrusive pyroclasts form in violent eruptions from lava in the air....
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Chapter 4a - Igneous Rocks - Understanding Earth Sixth...

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