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The Genesis of Blue Diamonds

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Résumé

Forming fluid: Primary and secondary inclusions may be the witness of a H 0-C parent fluid 2 graphite Mineral assemblage: Inclusion of Ilmenite : Eclogitic paragenesis at lithospheric depth Inclusion of walstromite (retrogressed Ca-Perovskite (CaTiO3); >9 Gpa): Sub-lithospheric depth Boron: inherited from sea water through the subduction zone : H 0 + C + boron, available in the 2 organic lithosphere after slab dehydration: Data suggest a deep recycling of marine fluids that may be the the parents of blue diamonds We suggest that blue diamonds are not exclusively ultra-deep and may form at any depth in the mantle, from lithosphere (>150km) down to the lower mantle (~750 km), in subduction-related B-CH O-rich fluids.
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Dates et versions

hal-02506335 , version 1 (12-03-2020)

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  • HAL Id : hal-02506335 , version 1

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Lucille Daver, Helene Bureau, Eloise Gaillou, E. Boulard, Benoît Baptiste, et al.. The Genesis of Blue Diamonds. 2019 Diamond Conference, Jul 2019, Warwick, United Kingdom. ⟨hal-02506335⟩
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