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<p>Diamonds crystallise from fluids/melts circulating in the Earth’s mantle. Analysis of these fluids is possible if they remain entrapped in the diamond during growth, but such fluid inclusions are rarely observed in gem-quality stones. We investigated thin films surrounding mineral inclusions, previously described as silicic fluid rims containing Si<sub>2</sub>O(OH)<sub>6</sub> and Si(OH)<sub>4</sub>, in gem-quality lithospheric diamonds from Siberia. Using micro-Raman spectroscopy and <b>L</b>aser-<b>A</b>blation <b>I</b>nductively-<b>C</b>oupled-<b>P</b>lasma-<b>M</b>ass-<b>S</b>pectrometry (LA-ICPMS) depth-profiling, we obtained compositional data from silicic fluid rims surrounding both silicate and non-silicate inclusions. Slow LA-ICPMS depth-profiling at the diamond-inclusion interface enabled differentiating the respective diamond/fluid-rim/mineral-inclusion contributions, allowing detection of Sr, Nb, Ba, La, Ce, Nd, and Th from the fluid rim. Here, we compare silicic fluid rims and other mantle-derived fluids/melts based on trace element ratios relative to the primitive mantle. Their (La/Nb)<sub>N</sub>_(Ba/Nb)<sub>N</sub> and (Nd/Nb)<sub>N</sub>_(Th/Nb)<sub>N</sub> systematics align with primitive mantle-like high-density fluids and group 2 kimberlites, suggesting an origin from kimberlite-like melts.</p>

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Trace element systematics constrain the origin of fluids that form gem-quality diamonds

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月29日

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  • Aleksandr Rakipov,
  • Alan B. Woodland,
  • Fabrizio Nestola,
  • Matilde Galiè,
  • Martha G. Pamato,
  • Davide Novella,
  • Maxwell C. Day,
  • Tobias Erhardt,
  • Wolfgang Müller

摘要

Diamonds crystallise from fluids/melts circulating in the Earth’s mantle. Analysis of these fluids is possible if they remain entrapped in the diamond during growth, but such fluid inclusions are rarely observed in gem-quality stones. We investigated thin films surrounding mineral inclusions, previously described as silicic fluid rims containing Si2O(OH)6 and Si(OH)4, in gem-quality lithospheric diamonds from Siberia. Using micro-Raman spectroscopy and Laser-Ablation Inductively-Coupled-Plasma-Mass-Spectrometry (LA-ICPMS) depth-profiling, we obtained compositional data from silicic fluid rims surrounding both silicate and non-silicate inclusions. Slow LA-ICPMS depth-profiling at the diamond-inclusion interface enabled differentiating the respective diamond/fluid-rim/mineral-inclusion contributions, allowing detection of Sr, Nb, Ba, La, Ce, Nd, and Th from the fluid rim. Here, we compare silicic fluid rims and other mantle-derived fluids/melts based on trace element ratios relative to the primitive mantle. Their (La/Nb)N_(Ba/Nb)N and (Nd/Nb)N_(Th/Nb)N systematics align with primitive mantle-like high-density fluids and group 2 kimberlites, suggesting an origin from kimberlite-like melts.