GEO 1111 Lecture Notes - Lecture 3: Seafloor Spreading, Rock Magnetism, Amphibole

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: David Schneider

Document Summary

Rock magnetism: mineral magnetic alignment is used to determine the direction of the magnetic pole, sediment rocks, steeper angles indicate rocks closer to the magnetic pole. Marine magnetic anomalies: discovery during wwii of the seabed plates, they move away from each other from middle ridge, formed in the middle of the seabed and move away towards the continents. Discoveries: spreading away, creating new material from mantle below, convection rises hot material and sinks cold ones. Tuzo wilson: theory of plate tectonics: earth is composed of shells, 7 major plate tectonics. Gravity is the force that drives all of these temperature gradients and the sinking of the tectonic plates. All evidence leads to the tectonic plates theory. Minerals: the building block of rocks that occurs naturally, is solid, definitive chemical composition and has a crystal structure (water ice or quarts: has an economic importance. Element: form of matter that cannot be broken down into a simpler form by any chemical reactions.