EESA06H3 Lecture 4: EESA06 Lecture 4
11 Jan 2016
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Topics for lecture 4 and for quiz 3 on thrusday feb 10th. The role of transform faults: iceland: walking over a mid-ocean ridge, magnetic stripes recorded in ocean floor crust and the age of ocean floors, basalt lava flows: fissure eruptions, volcanic activity under glaciers: jokulhlaups, geothermal energy. Oceans only widen(rift) to a certain width then they start to close - subduction cooling away from ridge and thickens at sides. It wants to sink back down to the mantle. History of continent is dictated by ocean history. Mid ocean ridge picture of history of mors. Are not continuous, are fractured enable ocean floor spreading on a curved earth surface eruptions. Fractures horizontal lines on mors basic fuel behind plate tectonics. Dykes result of hot magma intruding into older rock, sheeted dykes - surrounding rock will be extended. Plumes supply the large amounts of magma.
