Diamond formation from mantle carbonate fluids

Abstract

Analysis of inclusions1 has shown that natural diamond forms at pressures of 5-6 GPa and temperatures in the range 900-1,400 °C. In non-metallic systems2,4, diamond has been synthesized only at pressures greater than 7 GPa and temperatures of more than 1,600 °C. We find that diamond can crystallize in alkaline carbonate-fluid melts at pressures and temperatures that correspond to those of natural diamond formation.

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Figure 1: Scanning electron micrographs of diamonds.

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