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Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite

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  • Sonja Aulbach

    (Goethe-Universität)

  • Thomas Stachel

    (University of Alberta)

Abstract

Cratonic eclogite is the product of oceanic crust subduction into the subcontinental lithospheric mantle, and it also is a fertile diamond source rock. In contrast to matrix minerals in magma-borne xenoliths, inclusions in diamond are shielded from external fluids, retaining more pristine information on the state of the eclogite source at the time of encapsulation. Vanadium is a multi-valent element and a widely used elemental redox proxy. Here, we show that that xenolithic garnet has lower average V abundances than garnet inclusions. This partly reflects crystal-chemical controls, whereby higher average temperatures recorded by inclusions, accompanied by enhanced Na2O and TiO2 partitioning into garnet, facilitate V incorporation at the expense of clinopyroxene. Unexpectedly, although diamond formation is strongly linked to metasomatism and xenoliths remained open systems, V concentrations are similar for bulk eclogites reconstructed from inclusions and from xenoliths. This suggests an oxygen-conserving mechanism for eclogitic diamond formation, and implies that eclogite is an efficient system to buffer fO2 over aeons of lithospheric mantle modification by subduction-derived and other fluids.

Suggested Citation

  • Sonja Aulbach & Thomas Stachel, 2022. "Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29567-z
    DOI: 10.1038/s41467-022-29567-z
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    References listed on IDEAS

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    1. Robert P. Rapp & Nobumichi Shimizu & Marc D. Norman, 2003. "Growth of early continental crust by partial melting of eclogite," Nature, Nature, vol. 425(6958), pages 605-609, October.
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