Mantle melting and basalt generation

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Sources of knowledge of mantleWhat is the mineralogy of the mantle and what happensto it when it melts?Lherzolite:A type of peridotite withOlivine > Opx + Cpx.Other major peridotites ofthe mantle includeharzburgite and dunite.Image: John Winter (2001)
Sources of knowledge of mantleWhat is the mineralogy of the mantle and what happensto it when it melts?Image: John Winter (2001)For peridotites with similarcompositions, the stablealuminous phase changeswith ihdepth h(P) (P). Thealuminous phase is a modifierto peridotite.Al-phase• Plagioclaseshallow (< 30 km)Pl + Ol = Opx + Cpx + Sp• Spinel30-80 kmSp + Opx = Ol + Grt• Garnet80-400 km
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Mantle melting and basalt generation

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