> 4 Components
Figure 7-13. Pressure-temperature
phase diagram for the melting of a
Snake River (Idaho, USA) tholeiitic
basalt under anhydrous conditions.
After Thompson (1972). Carnegie
Inst. Wash Yb. 71
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An overview of the processes involved in mantle melting, including the effects of temperature, pressure, and volatiles. It includes several figures from various sources that illustrate the phase diagrams and mineralogical transformations during melting. The document also discusses the importance of understanding mantle melting in the context of magma genesis and geodynamics.
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4 Components Figure 7-13. Pressure-temperaturephase diagram for the melting of aSnake River (Idaho, USA) tholeiiticbasalt under anhydrous conditions.After Thompson (1972). CarnegieInst. Wash Yb.
Experiments on melting mantle
samples:
- Tholeiite easily
created
by 10-30% PM
- More silica saturated
at lower P
- Grades toward alkalic
at higher P
Figure 10-17a. After Jaques and Green (1980).Contrib. Mineral. Petrol., 73, 287-310.
How does the mantle melt??
1) Increase the temperature
Figure 10-
2) Lower the pressure
- Adiabatic rise of mantle with no conductive heat loss - Decompression melting could melt at least 30%
Figure 10-
Oblique View Isothermal Section