Fate of CaSiO3 in the hydrous lower mantle

Calcium perovskite, CaSiO3 (Ca-Pv) is the third most abundant mineral of the lower mantle constituting from 6 to 12 wt.%. Recent advances on the deep-water cycle demonstrate that water can be delivered to the deepest portions of the lower mantle, alternating its properties and mineralogy. Even though Ca-Pv have been intensively investigated over the last decades, our knowledge on fate of Ca-Pv in the presence of water is very limited, also due to the methodological limitations. In order to provide a comprehensive picture on Ca-Pv-H2O interactions at conditions of the lower mantle, we propose to perform in situ powder and single-crystal multi-grain X-ray diffraction (SCXRD) at pressures 30-120 GPa and temperatures 1500-2900 K.