3:15 PM - 3:30 PM
[SCG16-06] Mantle processes inferred from Os isotopic compositions and micro lectures of carbonado diamonds
Keywords:carbonado, Os isotopic compositions, platinum group elements, mineral texture, inclusions, diamonds
In this study, we tried to extract geochemical and mineralogical information from inside of diamond grains and grain boundaries, independently. We conducted Os isotopic analysis and electron microscopic observation on carbonado samples collected from placer deposits in the Central African Republic. We obtained very different results between inside of diamond grains and grain boundaries both on the Os isotopic values and mineralogy of inclusions. The origin of carbonado will be discussed based on the intrinsic information obtained from the inside of diamond grains.