@article{fdi:010053048,
  title = {{T}race element partitioning between carbonatitic melts and mantle transition zone minerals : implications for the source of carbonatites},
  author = {{D}alou, {C}. and {K}oga, {K}. {T}. and {H}ammouda, {T}. and {P}oitrasson, {F}ranck},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he occurrence of {CO}2-rich lavas (carbonatites, kimberlites) and carbonate-rich xenoliths provide evidence for the existence of carbonatitic melts in the mantle. {T}o model the chemical composition of such melts in the deep mantle, we experimentally determined partition coefficients for 23 trace elements (including {REE}, {U}-{T}h, {HFSE}, {LILE}) between deep mantle minerals and carbonatite liquids at 20 and 25 {GP}a and 1600 degrees {C}. {U}nder these conditions, majoritic garnet and {C}a{S}i{O}3 perovskite are the main reservoirs for trace elements. {T}his study used both femtosecond {LA}-{ICP}-{MS} and {SIMS} techniques to measure reliable trace element concentrations. {C}omparison of the two techniques shows a general agreement, except for {S}c and {B}a. {O}ur experimentally determined partition coefficients are consistent with the lattice strain model. {T}he data suggest an effect of melt structure on partition coefficients in this pressure range. {F}or instance, strain-free partition coefficient ({D}-0) for majorite-carbonatite melts do not follow the order of cation valence, {D}-0(2+) > {D}-0(3+) > {D}-0(4+) observed for majorite-{CO}2-free silicate melts. {T}he newly determined partition coefficients were combined with trace element composition of majoritic garnets found as inclusions in diamond to model trace element patterns of deep-seated carbonatites. {T}he result compares favorably with natural carbonatites. {T}his suggests that carbonatites can originate from the mantle transition zone.},
  keywords = {},
  booktitle = {},
  journal = {{G}eochimica et {C}osmochimica {A}cta},
  volume = {73},
  numero = {1},
  pages = {239--255},
  ISSN = {0016-7037},
  year = {2009},
  DOI = {10.1016/j.gca.2008.09.020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053048},
}