EOSC 114 Lecture Notes - Geothermal Heating, Metro Vancouver Regional District, Hydrogen Sulfide
Document Summary
For magma to rise through the crust it must be less dense than the crust, runny enough to flow and hot enough to stay liquid, all this depends on its composition and temperature. At depth magma has less than 10% gas dissolved in it (h20, co2, so2, cl) this means decreased viscosity and decreased density. The gas becomes less soluble as pressure decreases. Any subsurface body of melt / crystals / bubbles / rock fragments resulting from melting of rock (gases dissolved and exsolved). Masses, sheets, or other bodies of magma at the earth"s surface. By the melting of pre-existing rock in the earth"s interior (mantle & crust). Units: g cm -3 or km m -3. Becomes more dense with cooling and pressure. Controls the flow, deformation, and eruption of magma. The composition of the magma affects the viscosity (especially h2o). There is a higher viscosity (gooey) when it is cooler, and more dense.