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The effect of pressure-induced solid-solid phase transitions on decompression melting of the mantle

The effect of pressure-induced solid-solid phase transitions on decompression melting of the mantle

Geochimica et Cosmochimica Acta 59(21): 0-4506

Pressure-release melting of the earth's mantle is thought to be an isentropic process. The intersection of an isentropic melting path with a solid-state phase transition affecting the residual minerals must result in some change in melting rate unless the entropy of reaction of the phase transition is exactly zero. Furthermore, both phase transitions of primary interest for peridotite melting in the upper mantle (garnet-spinel peridotite and spinel-plagioclase peridotite) have positive Clapeyron slopes, and hence the lower-pressure assemblage has a higher molar entropy. Thus, these phase transitions must retard isentropic, decompression melting, or even lead to freezing. There cannot be enhanced melting accompanying such phase transitions, even if there is a cusp in the solidus.

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Accession: 020330772

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DOI: 10.1016/0016-7037(95)00252-u

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