@article{fdi:010077141,
  title = {{M}antle plumes are oxidised},
  author = {{M}oussallam, {Y}ves and {L}ongpre, {M}. {A}. and {M}c{C}ammon, {C}. and {G}omez-{U}lla, {A}. and {R}ose-{K}oga, {E}. {F}. and {S}caillet, {B}. and {P}eters, {N}. and {G}ennaro, {E}. and {P}aris, {R}. and {O}ppenheimer, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{F}rom oxic atmosphere to metallic core, the {E}arth's components are broadly stratified with respect to oxygen fugacity. {A} simple picture of reducing oxygen fugacity with depth may be disrupted by the accumulation of oxidised crustal material in the deep lower mantle, entrained there as a result of subduction. {W}hile hotspot volcanoes are fed by regions of the mantle likely to have incorporated such recycled material, the oxygen fugacity of erupted hotspot basalts had long been considered comparable to or slightly more oxidised than that of mid-ocean ridge basalt ({MORB}) and more reduced than subduction zone basalts. {H}ere we report measurements of the redox state of glassy crystal-hosted melt inclusions from tephra and quenched lava samples from the {C}anary and {C}ape {V}erde {I}slands, that we can independently show were entrapped prior to extensive sulphur degassing. {W}e find high ferric iron to total iron ratios ({F}e3+/{S}igma {F}e) of up to 0.27-0.30, indicating that mantle plume primary melts are significantly more oxidised than those associated with mid-ocean ridges and even subduction zone. {T}hese results, together with previous investigations from the {E}rebus, {H}awaiian and {I}celandic hotspots, confirm that mantle upwelling provides a return flow from the deep {E}arth for components of oxidised subducted lithosphere and suggest that highly oxidised material accumulates or is generated in the lower mantle. {T}he oxidation state of the {E}arth's interior must therefore be highly heterogeneous and potentially locally inversely stratified.},
  keywords = {oxygen fugacity ; degassing ; {XANES} ; melt inclusions ; mantle plumes ; {CANARIES} ; {EL} {HIERRO} ; {LANZAROTE} ; {FOGO} {VOLCAN} ; {CAP} {VERT} {ILES} ; {ANTARCTIQUE} ; {ROSS} {ILE} ; {EREBUS} {VOLCAN} ; {HAWAII} ; {ISLANDE}},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {527},
  numero = {},
  pages = {art. 115798 [10 p.]},
  ISSN = {0012-821{X}},
  year = {2019},
  DOI = {10.1016/j.epsl.2019.115798},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077141},
}