EESA06-Monday, 3 , February
Terms to remember
Jokulhlaup is a flood caused by volcanic activity underneath ice(glaciers)
Reykjavik (smokey bay- hot springs)
Tephra – (Volcanic Ash)
Pyroplastic – To be broken by fire
Forces – why oceans eventually close
Erupt beneath ice or glaciers
Slab pulling and Slab rollback makes the lithosphere form a trench suction.
The volcanoes gets more active when the ice is thinner.
Iceland is an oceanic crust that has been dried up. Because the crust has been pushed up.
It is a part of the MOR andit is both dry land and Oceanic crust.
Iceland field camp slide – The crust is expanding.
The Geology of Iceland
Thingvellir Reykjavik first civilization of Vikings
The Medieval Warm period before the ice age.
Iceland’s major volcanoes – Eyjafjallajoekull(2010)
The Iceland Plume
Ridge “JUMP” – Slide 13
The spreading centre, which is above the plume gets cuts off and it dies
The plumes underneath pushes the rocks aside and it gets moved (The plume)
The Ridge jump is when the old plume dies and a new plume starts off somewhere else
The plumes don’t moves, but the spreading centre is what changes.
Pushed by the sources of magma (carrying mid ocean ridges away.)
The eruption of lakagigar (1783) – The largest eruption at that time. –