Change of Melting Point of Diopside with Pressure

Abstract

The melting point of synthetic diopside under pressures up to 5,000 bars was found by experiment to be well represented by the equation. $$t_{m} = 1391.5 + 0.01297P$$, where $$t_m$$ is the melting point in °C. and P is the pressure in bars. The character of the melting curve supports the prevailing view that the melting curve rises indefinitely with depth in the earth. The considerable volume change involved in melting is emphasized in a quantitative review of the process of magma production and extrusion.