The use of C-13 diamond as pressure and temperature sensor for diamond-anvil-cell experiments

摘要

This study aims at providing an accurate method to determine in situ the pressure in the sample chamber during a diamond-anvil-cell experiment. We report the calibration of the frequency shift with pressure of the Raman band of a 98.3 at. C-13 diamond against ruby and SrB4O7:Sm2+. This method is suitable for the study of geological fluids during hydrothermal experiments performed at pressures up to 16 GPa and temperature up to 800 degrees C, particularly for subduction-zone processes involving fluids or/and silicate melts. Experiments were carried out in a new hydrothermal diamond-anvil cell (HDAC) designed for the study of geological fluids at crustal and mantle pressures.