@article{PAR00013723,
  title = {{I}s the transition zone a deep reservoir for fluorine ?},
  author = {{R}oberge, {M}. and {B}ureau, {H}. and {B}olfan-{C}asanova, {N}. and {F}rost, {D}. {J}. and {R}aepsaet, {C}. and {S}urble, {S}. and {K}hodja, {H}. and {A}uzende, {A}. {L}. and {F}iquet, {G}uillaume},
  editor = {},
  language = {{ENG}},
  abstract = {{I}t is now recognized that the transition zone ({TZ}) is a significant repository for water. {T}his means that other volatile species may also be stored in this region such as halogen elements. {W}e have measured the solubility of fluorine in wadsleyite ({W}d) and ringwoodite ({R}w) under hydrous and anhydrous conditions at different pressures and temperatures, relevant for the transition zone. {F} contents are similar in {W}d (665 to 1045 ppm {F}, up to 956 ppm {H}2{O}) and in {R}w (186 to 1235 ppm {F}, up to 1404 ppm {H}2{O}). {T}his suggests that {F} may be incorporated in the same manner as water in the major nominally anhydrous minerals of the {TZ}: ringwoodite and wadsleyite and that the transition zone could be a major reservoir for fluorine. {I}n the framework of the "water filter model" proposed by {B}ercovici and {K}arato (2003), the contrast of volatile element contents between a depleted upper mantle and an enriched transition zone could be maintained over geological time scales. {P}revious estimates of the fluorine content of the {B}ulk {S}ilicate {E}arth ({BSE}), such as 25 ppm by mass ({M}c{D}onough and {S}un, 1995), have assumed a homogeneous mantle. {A}lthough we do not know whether the {TZ} is {F} saturated or not, we used our new experimental data and estimates of the lower mantle {F} content from ocean island basalts to estimate a maximum {BSE} fluorine content of 59 ppm by mass for a hydrous, {F}-saturated {TZ}. {T}his upper bound on the range of possible {BSE} {F} content emphasizes the challenges when explaining the origin of volatile elements in the {E}arth from a carbonaceous chondrite late veneer.},
  keywords = {fluorine ; ringwoodite ; wadsleyite ; water solubility ; transition zone},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {429},
  numero = {},
  pages = {25--32},
  ISSN = {0012-821{X}},
  year = {2015},
  DOI = {10.1016/j.epsl.2015.07.051},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00013723},
}