How is pressure changing (circle one)? increasing decreasing no change How is te
ID: 235753 • Letter: H
Question
How is pressure changing (circle one)? increasing decreasing no change How is temperature changing (circle one)? increasing decreasing no change Type of melting (choose one): decompression melting addition of heat addition of volatiles Where does this type of melting occur? (choose only one) partial melting of the surrounding crust as magma rises through it partial melting of the asthenosphere as it flows as a plastic solid up toward the surface (through convection) partial melting of the asthenosphere above a subducting plateExplanation / Answer
Section A
1. No change in the Pressure
2. Temperature increases
3. Melting is occured by addition of heat.
4. Partial melting of the surrounding crust as magma rises through it.
Above mechanism of melting is caused by the Transfer of heat mcanish and it's mainly associated with continental rift valleys, hot spots, and subduction related environments.
Section B
1.pressure decreases
2. No change in Temperature
3. Melting occured by Decompression melting.
4. Partial melting of asthenosphere as it flows as a plastic solid up toward the surface.
Decompression melting is associated with upwelling mantle appears to occur below the oceanic ridges, at hot spots, and below the continental rift valleys.
Section C
1. No change
2. No change
3. Addition of volatiles
4. Parial melting of the asthenosphere above a subducting plate
Hydrous minerals i.e, hornblende, biotite, or clay minerals would be released by the rising temperature and then move into the overlying mantle. Penetration of this water in the mantle would then lower the melting temperature of the mantle to generate partial melts.