Week Eleven Notes-Geology G-104
Week Eleven Notes-Geology G-104 GEOL-104 20584
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This 5 page Class Notes was uploaded by Ashley Hughes on Friday April 3, 2015. The Class Notes belongs to GEOL-104 20584 at Indiana University taught by Laura Wasylenki in Spring2015. Since its upload, it has received 93 views. For similar materials see Evolution of the Earth in Geology at Indiana University.
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Date Created: 04/03/15
33115 G104 Ocean crust spreads apart and grows o Mechanism earth is hot inside 0 Grows 310 cm per year I Divergent boundary The mantle is solid but it ows 0 It convects because it is trying to lose heat 0 The crust is just scum going along for the ride I Made of mineral crystals similar to silly putty What do these crystal plates look like 0 Tracking earthquake waves gives us the picture picture on Oncourse PowerPoint O olithosphere obrittle oplates ohigh si Crust obetween crust and mantle Motto Boundary oatnenosphere weak Mantle IZZ39l ine omoderate si high Fe oCrazy Fe Core Are plates moving now 0 Yes and now we can see that with GPS 0 lntemal deformation why arrows going different ways on plates 0 So some plates are spreading apart some are crashing together and some are moving sidebyside 0 Which of the following statements about magnetism in rocks on the ocean oor are true choose all that apply 0 A and D 0 Why is magma forming in the solid mantle under the midocean ridges 0 Doesn t the temperature get higher are you go deeper o Rocks melt differently from stuff we re used to 0 Solid compH20 0 Solid melt100 at a single temperature 0 Liquid compH20 0 Solid peridotite45 silica and 64 Fe 0 It melts over a range of temperatures to make basaltie magma with 55 silica and 0 Why does magma form beneath the ridges Chart on Oncourse PowerPoint o How to melt rock I Depressurize it melting temperature drops 0 Mantle tock basalt I Add water melting temperature drops 0 Mantle and lower crust andesite rhyolite o If you have this boundary does it have earthquakes 4215 0 Boundaries o Divergent midocean spreading ridge I Magmatism pressure decrease I Ma c basalts gabbro I Has very small shallow earthquakes when magma moveserupts o Convergent oceanocean subduction zone I Line of volcanoes called ocean island arc I Magmatism water from subducting slab lowers melting point of overriding plate I Large earthquakes all along slab very deep I Volcano chain andesite o Convergent oceancontinent subduction zone I Magmatism water from subducting slab lowers melting point of overriding plate including crust I Large earthquakes all along slab very deep also shallow o Depends on slab location I Volcano chain andesite dacite rhyolite granite 0 Why do magmas come in two compositions o Mantle rock depressurization melts to become basaltgabbro moderate silica rich in Fe and Mg 0 Mantle or lower crust water melts to become andesite high silica low Fe and Mg or daciterhyolite granite very high Si low Fe o Boundaries continued 0 Convergent continental collision I Two continental plates come together neither is dense enough to dive down I Big earthquakes as plates deform each other I Last bits of magmatism from what was the ocean plate but then it stops I Folding and faulting o Thrust faults o Sidebyside transform strikeslip I Earthquakes shallow big friction I No volcanoes no melting 0 Continental rifting future midocean spreading centers I Earthquakes and volcanoes I Pangea subjected to continental rifting created present day continents I Continental rift zone 0 Folding compression causes the rocks to gradually buckle and deform though they stay solid the whole time o Syncline curves up 0 Anticline curve down 0 Faulting brittle deformation rocks move a bit at a time along a fault plane 0 Lots of folds and thrust faults from compression are often seen in collision zones 0 Which of the following result from stretching or extension of the crust o Anticline folds frowning Syncline folds smiling Normal faults upper block slides down Thrust faults upper block slides up Strikeslip faults sidetoside
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