geo303 exam 2 - What are tektites? What is Iridium? What is...

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What are tektites? What is Iridium? What is shocked quartz? In what way are tektites, Iridium, and shocked quartz related to the K/T extinction event? In what way are the Deccan and Siberian flood basalt provinces related to mass extinction events? Which of these is related to the Permian extinction (the greatest mass extinction event of all time)? . . . which is related to the K/T extinction? What geologic time unit (Eon, Era, Period, Epoch) represents the greatest expanse of geologic time? What is the Era of Ancient Life called? . . . the Era of Middle Life? . . . the Era of Recent Life? . . . the age of the Dinosaurs? . . . the age of Mammals? Eon Know and be able to describe the impact events at Tunguska, Chicxulub, and Meteor Crater. Know the contributions of Eugene Shoemaker and Walter and Louis Alvarez in expanding our knowledge of meteorite impacts. What did Walter Alvarez find at the K/T boundary? Clay Layer What are the three magma types? What rocks do they produce? Which is more viscous, a basaltic (mafic) magma or a rhyolitic (felsic) magma? Define viscosity. Know the relationship between viscosity and the explosive potential of an eruption. Is a basaltic magma more explosive or less explosive than a rhyolitic magma? Are lava flows more likely to be composed of rhyolite or basalt (think about their viscosity). Is a lava dome generally composed of lava with a low viscosity, or a high viscosity ? . . . a low gas content or a high gas content? What is aa? . . . pahoehoe? . . . pillow lava, . . . a lava tube? What type of magma/lava are these features usually associated with (basalt, andesite, or rhyolite)? What is obsidian? . . . pumice? . . .vesicles? The chilling and crystallization of basaltic lava around the sides, bottom, and top of lava channels produces a rock-encased conduit called a lava tube . As demonstrated above, felsic magmas will either (1) erupt explosively to produce extensive deposits of tephra, or (2) nonexplosively to produce degassed, viscous lava (domes, coulees, or obsidian flows ) which advance only short distances from their vents. PUMICE
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This note was uploaded on 04/12/2008 for the course GEOL 303 taught by Professor Camp during the Spring '07 term at San Diego State.

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geo303 exam 2 - What are tektites? What is Iridium? What is...

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