LECTURE 5 EESA06-Monday, 3rd, February Terms to ...
LECTURE 5 EESA06-Monday, 3rd, 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 and it 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. – (French revolution) The Temperatures and climates changed. Slide 11 – Greenland and Europe were together and Iceland plumes were still there. The Greenland ice cap glacier is above the basalt and basalt igneous provinces. They got very shallow water because the ice sheet requires more water, When the plumes open, a hot spot trail is made. (example: the Hawaii volcanoes)
LECTURE 5 Slide 12 – Pio Plesiocene formation the newer rock is closer to the volcanic eruption The Iceland floor is spreading away. The diameter of the island is increasing
Slide 16- sea floor spreading – magnetic changes recorded on the lava flows The same pattern could be found in Iceland. Slide 17- The intrusion (c) To accommodate the rocks being pushed apart, the ds is being pushed up. This is helping to build the oceanic crust.
(dykes?) The ice sheets on the volcanoes creates giant floods. ICE ON TOP OF HOT VOLCANOES. Iceland is most of shield volcanoes Jokulhlaups – The flood
Fissures (Cracks) – evidence that Iceland has been spreading Aa lava – Broken and rough Pahoehoe lava – splattering lava/not so violent and smooth (also known as Roppy lava) Lava tubes- that carries the hot lava / magma to further away. The cold air moves through the tubes. Columnar basalt – columns that formed after lava flow.
Tephra – layers of Volcanic ash + PYROPLASTIC (general term for ash
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 and it 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. – (French revolution) The Temperatures and climates changed. Slide 11 – Greenland and Europe were together and Iceland plumes were still there. The Greenland ice cap glacier is above the basalt and basalt igneous provinces. They got very shallow water because the ice sheet requires more water, When the plumes open, a hot spot trail is made. (example: the Hawaii volcanoes)
LECTURE 5 Slide 12 – Pio Plesiocene formation the newer rock is closer to the volcanic eruption The Iceland floor is spreading away. The diameter of the island is increasing
Slide 16- sea floor spreading – magnetic changes recorded on the lava flows The same pattern could be found in Iceland. Slide 17- The intrusion (c) To accommodate the rocks being pushed apart, the ds is being pushed up. This is helping to build the oceanic crust.
(dykes?) The ice sheets on the volcanoes creates giant floods. ICE ON TOP OF HOT VOLCANOES. Iceland is most of shield volcanoes Jokulhlaups – The flood
Fissures (Cracks) – evidence that Iceland has been spreading Aa lava – Broken and rough Pahoehoe lava – splattering lava/not so violent and smooth (also known as Roppy lava) Lava tubes- that carries the hot lava / magma to further away. The cold air moves through the tubes. Columnar basalt – columns that formed after lava flow.
Tephra – layers of Volcanic ash + PYROPLASTIC (general term for ash
