@article{fdi:010060350,
  title = {{O}n the iron isotope heterogeneity of lithospheric mantle xenoliths : implications for mantle metasomatism, the origin of basalts and the iron isotope composition of the {E}arth},
  author = {{P}oitrasson, {F}ranck and {D}elpech, {G}. and {G}r{\'e}goire, {M}ichel},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ith the aim to better understand the cause of the iron isotope heterogeneity of mantle-derived bulk peridotites, we compared the petrological, geochemical and iron isotope composition of four xenolith suites from different geodynamic settings; sub-arc mantle ({P}atagonia); subcontinental lithospheric mantle ({C}ameroon), oceanic mantle ({K}erguelen) and cratonic mantle ({S}outh {A}frica). {A}lthough correlations were not easy to obtain and remain scattered because these rocks record successive geological events, those found between delta {F}e-57, {M}g#, some major and trace element contents of rocks and minerals highlight the processes responsible for the {F}e isotope heterogeneity. {W}hile partial melting processes only account for moderate {F}e isotope variations in the mantle (< 0.2 a{E}uro degrees, with bulk rock values yielding a range of delta {F}e-57 +/- {A} 0.1 a{E}uro degrees relative to {IRMM}-14), the main cause of {F}e isotope heterogeneity is metasomatism (> 0.9 a{E}uro degrees). {T}he kinetic nature of rapid metasomatic exchanges between low viscosity melts/fluids and their wall-rocks peridotite in the mantle is the likely explanation for this large range. {T}here are a variety of responses of {F}e isotope signatures depending on the nature of the metasomatic processes, allowing for a more detailed study of metasomatism in the mantle with {F}e isotopes. {T}he current database on the iron isotope composition of peridotite xenoliths and mafic eruptive rocks highlights that most basalts have their main source deeper than the lithospheric mantle. {F}inally, it is concluded that due to a complex geological history, {F}e isotope compositions of mantle xenoliths are too scattered to define a mean isotopic composition with enough accuracy to assess whether the bulk silicate {E}arth has a mean delta {F}e-57 that is chondritic, or if it is similar to 0.1 a{E}uro degrees above chondrites as initially proposed.},
  keywords = {{I}ron isotopes ; {M}antle peridotites ; {M}etasomatism ; {M}elt extraction},
  booktitle = {},
  journal = {{C}ontributions to {M}ineralogy and {P}etrology},
  volume = {165},
  numero = {6},
  pages = {1243--1258},
  ISSN = {0010-7999},
  year = {2013},
  DOI = {10.1007/s00410-013-0856-7},
  URL = {https://www.documentation.ird.fr/hor/fdi:010060350},
}