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- W1569571137 abstract "A systematic search of 14,500 carats of diamonds (approximately 232,000 stones) from the Finsch kimberlite yielded 1024 diamonds with microscopic inclusions. Sulphides (358), graphite (132) and clouds (23) constitute almost exactly half of these. Of the rest 501 inclusions are minerals of peridotitic composition whilst 10 are eclogitic. The mineral inclusions appear to be in equilibrium with each other and diamond. The peridotitic minerals are: olivine (60%), orthopyroxene (20%) garnet (20%) and chromite (1%). The eclogitic minerals are garnet, clinopyroxene and kyanite. A total of 100 minerals from 80 diamonds have been analysed including 14 garnet/olivine, 2 garnet/orthopyroxene, 1 olivine/chromite, 1 orthopyroxene/silica phase, 1 garnet/clinopyroxene and 1 clinopyroxene/phlogopite pairs. The peridotitic minerals are distinctively depleted in calcium and have high Mg/Fe and Cr/Al ratios. The eclogitic minerals have opposite characteristics. The 2 garnet/orthopyroxene pairs could have formed at virtually identical temperatures and pressures. These conditions were within the diamond stability field at a temperature close to 1100°C and a pressure close to 50 kb. The peridotitic inclusions and the associated diamonds crystallised from a melt formed by a small degree of partial melting of a garnet lherzolite mantle in the presence of water and CO2. Capture of Ca++ by $${rm CO}_{rm 3}ˆ{{rm - - }} $$ is proposed to account for the calcium depleted nature of the mineral inclusions in these diamonds. Based on mineral abundances ∼98% of the diamonds at Finsch formed during this process. The remaining ∼2% are considered to be derived from a pre-existing diamondiferous eclogite horizon sampled by the kimberlite during its ascent through the mantle." @default.
- W1569571137 created "2016-06-24" @default.
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- W1569571137 date "1979-01-01" @default.
- W1569571137 modified "2023-10-14" @default.
- W1569571137 title "Silicate and oxide inclusions in diamonds from the Finsch kimberlite pipe" @default.
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- W1569571137 doi "https://doi.org/10.1029/sp015p0001" @default.
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