An experimental study of liquid compositions in equilibrium with plagioclase + spinel lherzolite at low pressures (0.75GPa)
Models of formation of basaltic crust at mid-ocean ridges by adiabatic upwelling of fertile mantle lherzolite require knowledge of phase relations and phase compositions during melting at appropriate pressures. Spinel + plagioclase lherzolites are found among peridotite samples from the ocean floor and ophiolitic exposures. At low pressure (<1.2 GPa) the five-phase assemblage (olivine + orthopyroxene + clinopyroxene + plagioclase + spinel) is present at the anhydrous lherzolite solidus. New...[Show more]
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|Source:||Journal of Petrology|
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