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Peer-reviewedCC BY-NC 4.0Science Advances

Oxygen fugacity, temperature, and pressure of Siberian eclogitic diamonds: Implications for the Archaean convecting mantle redox state

  • Giulia Marras1,2
  • Denis Mikhailenko3
  • Catherine A. McCammon4
  • Sonja Aulbach5
  • Yuhang Lu6
  • Renbiao Tao6
  • Alla Logvinova7
  • Dmitry Zedgenizov3
  • Vincenzo Stagno1,6
7 affiliations
  1. 1Department of Earth Sciences, Sapienza University of Rome, Rome, Italy.
  2. 2Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium.
  3. 3Zavaritsky Institute of Geology and Geochemistry, UB of RAS, Ekaterinburg, Russia.
  4. 4Bayerisches Geoinstitut, Universität Bayreuth, Germany.
  5. 5Institute of Geosciences, Goethe-Universität, Frankfurt am Main, Germany.
  6. 6Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing, China.
  7. 7Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk, Russia.
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Abstract

Kimberlite-borne eclogite xenoliths ultimately derive from ancient subducted oceanic crust. Some specimens still record the chemical and redox conditions of their igneous protoliths, allowing a view into contemporaneous convecting mantle sources. However, accurate reconstructions are limited because eclogites have been exposed to metasomatism in the subcontinental mantle for billions of years. Here, we investigated garnet and clinopyroxene inclusions, both touching and nontouching pairs, in 19 eclogitic diamonds from the Siberian craton, hence shielded from post-entrapment overprint. Inclusion compositions indicate average sampling depths of 180 to 280 km, temperatures of 1030° to 1540°C (±60°C), and redox conditions, for most of the samples, oxidized enough for diamonds to have originated from water(carbonate)-rich fluids. The reconstructed bulk composition points to basaltic oceanic crust formed from an Archaean convecting mantle region that was more oxygen-depleted than today, providing compelling evidence of redox heterogeneities in the source rocks of ancient oceanic crust.

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Cite

BibTeXRIS
BibTeX
@article{marras2026oxygen,
  title = {{Oxygen fugacity, temperature, and pressure of Siberian eclogitic diamonds: Implications for the Archaean convecting mantle redox state}},
  author = {Giulia Marras and Denis Mikhailenko and Catherine A. McCammon and Sonja Aulbach and Yuhang Lu and Renbiao Tao and Alla Logvinova and Dmitry Zedgenizov and Vincenzo Stagno},
  journal = {Science Advances},
  year = {2026},
  month = nov,
  doi = {10.1126/sciadv.aeb0364},
  url = {https://www.science.org/doi/abs/10.1126/sciadv.aeb0364},
  note = {CC BY-NC 4.0},
}
RIS
TY  - JOUR
TI  - Oxygen fugacity, temperature, and pressure of Siberian eclogitic diamonds: Implications for the Archaean convecting mantle redox state
AU  - Giulia Marras
AU  - Denis Mikhailenko
AU  - Catherine A. McCammon
AU  - Sonja Aulbach
AU  - Yuhang Lu
AU  - Renbiao Tao
AU  - Alla Logvinova
AU  - Dmitry Zedgenizov
AU  - Vincenzo Stagno
PY  - 2026
DA  - 2026/11/04
JO  - Science Advances
DO  - 10.1126/sciadv.aeb0364
UR  - https://www.science.org/doi/abs/10.1126/sciadv.aeb0364
AB  - Kimberlite-borne eclogite xenoliths ultimately derive from ancient subducted oceanic crust. Some specimens still record the chemical and redox conditions of their igneous protoliths, allowing a view into contemporaneous convecting mantle sources. However, accurate reconstructions are limited because eclogites have been exposed to metasomatism in the subcontinental mantle for billions of years. Here, we investigated garnet and clinopyroxene inclusions, both touching and nontouching pairs, in 19 eclogitic diamonds from the Siberian craton, hence shielded from post-entrapment overprint. Inclusion compositions indicate average sampling depths of 180 to 280 km, temperatures of 1030° to 1540°C (±60°C), and redox conditions, for most of the samples, oxidized enough for diamonds to have originated from water(carbonate)-rich fluids. The reconstructed bulk composition points to basaltic oceanic crust formed from an Archaean convecting mantle region that was more oxygen-depleted than today, providing compelling evidence of redox heterogeneities in the source rocks of ancient oceanic crust.
SN  - 2375-2548
ER  -