EESA06H3 Lecture Notes - Lecture 4: Diorite, Medieval Warm Period, Mantle Plume
Document Summary
Lecture 4 - how oceans widen: iceland & the atlantic. Continue with reading chapter 1-4: mid-ocean ridges: modern and ancient (ophiolites - fossil mors, transform faults, iceland: walking over a mid-ocean ridge, volcanic activity under glaciers: jokulhlaups, geothermal energy. Vancouver - pacific plate is being driven down below north america (cascadia), there will be an earthquake there soon. Passive margin - small earthquakes can still occur along a passive margin, it is where the plate is being created and pushing the rest of the plate westward, in this case (north american plate), driving. Very steep slope called the continental slope. Mass flows - sediments cascades down the slope into the deep abyssal plains. Submarine fans - sediments comes out of the slope/submarine canyon. On the shelf there is lots of life - reefs, fish, light etc. Continental environments (on land) and marine environments (ocean) Transform faults: enable sea floor spreading on a spherical surface.
