element study

The association of some diamonds with metasomatic minerals and with veins and alteration zones in xenoliths, as well as their morphology and internal symmetric textures suggest the involvement of fluids in their formation. Infrared spectroscopy and EPMA of microinclusion-bearing diamonds revealed that the microinclusions trapped high-density fluids (HDFs) with compositions varying along two arrays between three end-members: carbonatitic, hydrous-silicic and hydrous-saline. The carbonatitic end-member is further divided into high- and low-Mg members (Klein BenDavid et al., 2008). Klein-BenDavid et al. (2007, 2008) suggested evolution from the high- through the low-Mg carbonatite to silicic and saline HDFs by crystallization of silicates and carbonates and liqui