GEOL 1330 Lecture Notes - Lecture 4: Oceanic Crust, Peridotite, Amphibole
20 Jul 2016
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First test is on the 23rd of september. The geologic process that act to transform one rock type into another. As magma cools, random movements of ions slow and arrange themselves into orderly crystalline structures. Molten rock that contains suspended crystals and dissolved gases. The change of temperature with depth, going from the earth"s surface down 3,000km. 250km below surface, the temp begins to dramatically increase. The rock were rigid, so it"s lithosphere boundaries. Then the mantle, the asthenosphere, which becomes more fluid as it conduct more heat. Minimum temperature at a specific depths required to melt a rock. If the pressure decreased, the melt would generate. Melting begins at the intersection of the melting curve and the geothermal gradient. Mantle plumes would rise onto the bottom of the lithosphere, generating the hotspot and feeding the magma into the volcanoes. Separation of a melt from earlier formed crystals.
