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Diamonds Challenge Geological Theories, Reveal Deep Mantle Secrets

10/1/2025

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Summary

Story summary

Two diamonds from South Africa with opposing chemical inclusions challenge existing geological theories.
They include oxidized carbonate minerals and reduced nickel alloys, indicating formation under different conditions.
The study provides the first empirical evidence of oxidation at depths of 174–292 miles.
Findings imply kimberlites originate deeper in the mantle, with ongoing work probing nickel's role.

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Story summary

Two diamonds from South Africa with opposing chemical inclusions challenge existing geological theories.
They include oxidized carbonate minerals and reduced nickel alloys, indicating formation under different conditions.
The study provides the first empirical evidence of oxidation at depths of 174–292 miles.
Findings imply kimberlites originate deeper in the mantle, with ongoing work probing nickel's role.