Geology Week 3 Notes
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This 4 page Class Notes was uploaded by Delo Baker on Sunday October 18, 2015. The Class Notes belongs to ESS 101 at a university taught by Swanson, Terry W in Fall 2015. Since its upload, it has received 69 views.
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Date Created: 10/18/15
ESS Week 3 Notes October 12m Garnet o periodic rock that makes up the upper mantle Asthenosphere o Represents where the upper mantle is at or near the upwelling 100350km Low velocity zone 0 As pressure decreases melting temperature decreases 0 As magma rises melting temperature decreases more than actual temperature 0 Partial Melt Will the melt phase have an identical composition as the sold phase minerals that do not melt No melt phase will not have the same composition as the residual solid phase 0 Melt phase Si02 rich felsic Less dense Less FeMg rick ma c Lighter colors Lower melting temperature 0 Solid phase Less Silica Femg rich More dense Darker in color Higher melting temperature 0 Origin of Basalt o Came from partial melting of garnetperiodontite asthenosphere Less dense causing it to rise creating new ocean oor Divergent Margins First start out from under continental crust because of convection currents 0 Continental crust insulates it o Melts crust until it breaks through IE East African rip zone 0 Highest points Kilimanjaro Mt Kenya because the hot crust rises Mapped the ocean oor nding ocean ridges 0 Found magnetic pulls pointing north and south Basalt rock formed and pulled in a circuitous form 0 Paci c has more spreading Subduction zone OceanOcean Lithosphere convergence or Ocean Continent lithosphere o leJapan Philippines 0 le Andes mountains cascades No subduction Continentalcontinental lithosphere collision 0 le Himalayan Mts European alps Partial melt if garnet periodontite mantle yield basalt Partial melt of subducted ocean lithosphere yield andesitic magma andesitic rock Oceanocean convergent o Basaltic lithosphere is melting o Crystals are larger the slower it cools Porphyritic crystals October 14th 0 Continental collisions are preceded by oceancontinental convergence 0 As continental lithosphere reaches subduction zone there is dif cult to subduct because of its low dens y o Collision causes upwarping and deformation of the ocean floor and ocean Lithosphere o Paleomagnetic record Allows us to know the latitude of the rock of when a rock crystalized Inclination of Magnetic flow 0 0 degrees horizontal o 90 degrees vertical allows us to track where the continents arehave moved 0 Example India Transform Boundaries o Offset midocean ridges 0 San Andreas fault Caused by Fairlong plate subducting Ranged from Mexico to Alaska October 16 2015 o All basalt on the ocean floor will be toward magnetic No h o Sea oor spreading causes the magnetic direction to change 0 Movement of plates explain this wandering of paleo magnetic pole Australia has a unique Fauna Why 0 Isolated for the longest period of time Has only been connected with Antarctica Closing of the Isthmus of Panama caused by the gulf stream 0 Minerals 0 Every mineral has different composition and form Caused by chemical composition Atomic arrangement 0 They are solid 0 Inorganic o Naturally occurring 0 Minerals form during crystallization of a magnetic melt o Faster smaller crystals 0 Slower bigger crystals 0 1st mineral to crystalize has the highest melting point 0 Minerals can precipitate from an aqueous solution 0 Example Salt deposits 0 Time restricted environment to allow a mineral to form 0 What Crystal system does emeralds belong to EXTRA CREDIT oWhy do elements bond Negative charged ions caed anions Positive charged ions caed cations Q Based on charge state and size Protons and neutrons contain most of the mass oCan have multiple masses 1st energy level of electrons o2 electrons 2nOI level 8 electrons 3mlevel 8 electrons
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