ERS120H5 Lecture Notes - Lecture 2: Fraxinus Nigra, Pumice, Shield Volcano
Document Summary
At some tectonic plate boundaries there are volcanoes, or hotspots. Volcanoes vary from place to place, so they categorize it. Effusive hawaii, to pour out, they tend to be not very dangerous. Explosive don"t be any(cid:449)here near it, dangerous. Based on viscosity, temperature, volatile (carbon dioxide and water) content. Bowens reactive series is connected to this. Higher viscosity = harder to flow, flows slower. Mafic vs silicic down in temperature = more silica content. Higher viscosity, very hot temperature = explosive volcanoes. If magma is very hot and mafic, mostly olivine = effusive volcanoes. If magma has low viscosity, the volatiles can make their way through it very easily. Given the shape and size of this volcano discuss the magma characteristics that might be erupting. Shield volcano = largest on the planet, in hawaii, shapes like a shield. 2 forms of rock formed by shield volcanoes. Same composition, sometimes the paheohoe turns in to a" a" la(cid:448)a.
