GEOL 1001 Chapter Notes - Chapter 4: Flux Melting, Subduction, Crystallization
Document Summary
Melts => magma (melt underground) or lava (melt at surface) Needed to be about 1100 650o c hot. Intrusive => under surface, cools out of sight: how do we melt rocks, decompression melting. Occurs at hot spots, mid ocean ridges, continental rifts: flux melting. Add volatiles => any type of gassy substance (water, steam, co2) Melts nearby crystal rock: components of melt (magma, magma, 4 major types of melt (magma, felsic. Aluminum, potassium, sodium, calcium, magnesium, iron are all present. Some gas can be present => dry magma little to no gas present/ wet magma equal to or more than 15% gas. Flux melting is usually associated with wet magma which has a lot of water vapor, co2, sulfur, nitrogen, and hydrogen: intermediate, mafic. Middle amount of silica (~52 66%) Initial source: mantle => mafic, ultramafic, crystal source => mafic, intermediate, felsic. The more crust something travels through, more silica will be present.
