Relationship of strontium isotope ratio and chemical composition of micro inclusions in fibrous diamonds: Implication for isotopically different components of the upper mantle.

  • Akagi Tasuku
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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Strontium isotope ratios in whole fibrous diamonds from Zaire do not correlate with Rb/Sr ratios, but with La/Ba and La/Nd ratios. Diamonds with lower La/Ba and higher La/Nd gave higher 87Sr/86Sr. Leaching experiments on crushed diamonds gave lower La/Ba and higher La/Nd for water leachate and higher La/Ba and lower La/Nd for acid leachate, and more importantly, the former has higher 87Sr/86Sr ratios than the latter, which is in accord with the experiments of whole diamonds. The two leachates are considered to be from water-rich fluid and carbonates, respectively. It is likely that the diamonds have formed in the environment where water-rich fluid and carbonate-rich fluid or melt were mixing and that the mixing may have triggered kimberlitic magmatism.

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