EESA06H3 Lecture 4: EESA06 Lecture 4.docx

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16 Dec 2012
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Atlantic ocean is mature ocean: 1. mid-ocean ridges:modern and ancient(opholites, 2. transform faults, 3. iceland:walking over a mid-ocean ridge, 4. volcanic activity under glaciers:iukulhlaups, 5. geothermal energy. Western marginvancouver driven to pacific platecascadia subduction zone driven down below north america. Passive margin-middle of atlantic ocean where it is created. Fig. 9. 38 sedimentary environments-slope have fans for sediments new frontier for oil nd gasto get changing envrionemtn of the planet to get the history. Mid ocean ridges-before fractureshave transform fuaults- segment the ridge. Bc,western marginscalled the terrains-slowly moving continental crusti. e. california. fate stuck on bc or alska causing an increation of terrains. Terrains now in the north developed long long time ago. Fig. 2. 12major earthquake in perumajor slabslab pull(pulling ridge push(push mid-ocean ridge away calling seafloor spreading) Mid ocean ridges(basalt) low in silica so tend to be magma and lava low viscosity since flow very easily. Mid ocean ridge as goes oneither sides-sea floor spreading. Fog. 10. 19( the orange ball-magma chamber where hot rock is melted)

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