Quiz Five (9:30-9:35 AM)
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1 Quiz Five (9:30-9:35 AM)
2 UNIVERSITY OF SOUTH ALABAMA GY 111: Physical Geology Lecture 10: Intrusive Igneous Rocks Instructor: Dr. Douglas W. Haywick
3 Last Time 1) Pyro-what? (air fall volcanic rocks) 2) Felsic and Intermediate Extrusive Rocks 3) Mafic Extrusive Rocks Web notes 9
4 Pyroclastic Igneous Rocks Pyroclastic: Pyro means fire. Clastic means particles; both are of Greek origin. Pyroclastic rocks are usually erupted from composite volcanoes (e.g., they are produced via explosive eruptions from viscous, cool lavas) The eruptions that produce pyroclastic rocks include phreatic, plinian and ultraplinian. These rocks cool extremely rapidly. Textures are glassy to aphanitic.
5 Pyroclastic Igneous Rocks Volcanic ash Pumice
6 Pyroclastic Igneous Rocks Volcanic ash Obsidian
7 Pyroclastic Igneous Rocks During pyroclastic eruptions, volcanic gas is produced in copious quantities (more so than ash and rock). water vapor (H 2 0) carbon dioxide (CO 2 ) hydrogen chloride (HCl) sulfur dioxide (SO 2 ) nitrogen oxide (N 2 O) Hydrogen cyanide (HCN) argon (Ar) helium (He)
8 Other pyroclastic rocks Volcanic Bombs Tuff Rhyolite Chalk board
9 Felsic/Intermediate Extrusive Igneous Rocks Mt. St. Helens Lava dome Felsic and intermediate rocks are classified by the amount of SiO 2 in their bulk chemistry (they have relatively high SiO 2 content). We can distinguish them on the basis of mineral composition and color. Rhyolite Andesite
10 Mafic Extrusive Igneous Rocks Basalt Mafic extrusive igneous rocks have relatively low SiO 2 contents in their bulk chemistry. Ultramafic extrusive igneous rocks are relatively rare today. Scoria
11 Mafic Extrusive Igneous Rocks Mafic extrusive igneous rocks erupted under water produce a unique structure called pillows. Pillow basalt forms at divergent plate boundaries like the Mid- Atlantic Ridge Pillow Basalt
12 Today s Agenda 1) Intrusive igneous rocks and the bodies they form 2) Summary diagram of all igneous rock types 3) Igneous rocks that suck Web notes 10
13 Intrusive Bodies Sills: horizontal sheet intrusions Dikes: non-horizontal sheet intrusions Laccolith: Large flat-bottomed intrusions Batholiths: really large intrusions
14 Intrusive Bodies The larger the intrusion, the slower the cooling and the larger the crystals (e.g., phaneritic to pegmatitic textures).
15 Igneous Rock Texture
16 Igneous Rock Texture
17 Igneous Rock Texture Texture
18 Igneous Rock Texture Texture Composition
19 Felsic and Intermediate Intrusive Igneous Rocks Form at convergent plate boundaries.
20 Felsic and Intermediate Intrusive Igneous Rocks Form at convergent plate boundaries. 1 2 Two types: 1) Ocean-ocean plate (Island Arcs) 2) Continent-Ocean Plate
21 Rhyolite Granite is a pink/pinkishwhite rock composed of orthoclase, quartz and biotite Felsic Igneous Rocks
22 Andesite Diorite is a black/white speckled rock composed of Na-Plagioclase, hornblende and biotite Intermediate Igneous Rocks
23 Mafic Intrusive Igneous Rocks Form at divergent plate boundaries and oceanic hot spots.
24 Basalt Gabbro is a bluegrey to grey rock composed of Ca- Plagioclase, pyroxene and olivine Gabbro
25 Ultramafic Intrusive Igneous Rocks Form deep in the Earth s interior. Only exposed in mountain belts in convergent plate boundaries.
26 Ultramafic Intrusive Igneous Rocks Dunite Peridotite Pyroxenite Ultramafic Igneous Rocks
27 Summary Diagram
28 Summary Diagram
29 Summary Diagram
30 Igneous Rocks That Suck
31 Igneous Rocks That Suck 1) Too much SiO 4 4- in the magma leads to early quartz precipitation during the intermediate stage = Quartz Diorite
32 1) Too little SiO 4 4- in the magma leads to no quartz precipitation during the felsic stage = syenite Igneous Rocks That Suck
33 Igneous Rocks That Suck
34 Today s Homework 1. Study; Lecture test 1 next Tuesday Next Tuesday Lecture test 1 Next Thursday Weathering, erosion and soils (sediment)
35 GY 111: Physical Geology Lecture 10: Intrusive Igneous Rocks Instructor: Dr. Doug Haywick This is a free open access lecture, but not for commercial purposes. For personal use only.
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