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Earth and Space Sciences · 术语表

什么是 Melt fraction？

Definition 7.9 University Earth and Space Sciences — Year 2 · 第 7 章 — Melting the Mantle

The melt fraction $F$ of a partially molten rock is the mass of melt it has produced divided by its initial mass. Between the solidus ( $F = 0$ ) and the liquidus ( $F = 1$ ), the temperature on the melting surface is a function $T(P, F)$ .

Melt fraction of a column of dry peridotite rising without exchanging heat, from the onset of melting to the surface, computed by conserving entropy with the melting function of Katz and others (2003), for a rock with 15\,\% clinopyroxene. At 1450\, C the clinopyroxene is used up near 25\, km and the curve steepens. — Melt fraction of a column of dry peridotite rising without exchanging heat, from the onset of melting to the surface, computed by conserving entropy with the melting function of Katz and others (2003), for a rock with $15\,\%$ clinopyroxene. At $1450\,{}^{\circ}\mathrm{C}$ the clinopyroxene is used up near $25\,\mathrm{km}$ and the curve steepens.

A triangular melting region beneath a ridge (schematic, not to scale; in reality z_0 is ten times the crustal thickness). Mantle rising beneath the axis crosses its solidus at z_0, melts as it rises, and stops melting when its flow turns horizontal under the moving plates; the melt percolates up and towards the axis and builds the crust. — A triangular melting region beneath a ridge (schematic, not to scale; in reality $z_0$ is ten times the crustal thickness). Mantle rising beneath the axis crosses its solidus at $z_0$ , melts as it rises, and stops melting when its flow turns horizontal under the moving plates; the melt percolates up and towards the axis and builds the crust.

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