@article{fdi:010070904,
  title = {{N}umerical modelling of erosion and assimilation of sulfur-rich substrate by martian lava flows : implications for the genesis of massive sulfide mineralization on {M}ars},
  author = {{B}aumgartner, {R}. {J}. and {B}aratoux, {D}avid and {G}aillard, {F}. and {F}iorentini, {M}. {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}antle-derived volcanic rocks on {M}ars display physical and chemical commonalities with mafic-ultramafic ferropicrite and komatiite volcanism on the {E}arth. {T}errestrial komatiites are common hosts of massive sulfide mineralization enriched in siderophile-chalcophile precious metals (i.e., {N}i, {C}u, and the platinum-group elements). {T}hese deposits correspond to the batch segregation and accumulation of immiscible sulfide liquids as a consequence of mechanicalithermo-mechanical erosion and assimilation of sulfur-rich bedrock during the turbulent flow of high-temperature and low-viscosity komatiite lava flows. {T}his study adopts this mineralization model and presents numerical simulations of erosion and assimilation of sulfide- and sulfate-rich sedimentary substrates during the dynamic emplacement of (channelled) mafic-ultramafic lava flows on {M}ars. {F}or sedimentary substrates containing adequate sulfide proportions (e.g., 1 wt% {S}), our simulations suggest that sulfide supersaturation in low-temperature (<1350 degrees {C}) flows could be attained at < 200 km distance, but may be postponed in high-temperature lavas flows (> 1400 degrees {C}). {T}he precious-metals tenor in the derived immiscible sulfide liquids may be significantly upgraded as a result of their prolonged equilibration with large volumes of silicate melts along flow conduits. {T}he influence of sulfate assimilation on sulfide supersaturation in martian lava flows is addressed by simulations of melt-gas equilibration in the {C}-{H}-{O}-{S} fluid system. {H}owever, prolonged sulfide segregation and deposit genesis by means of sulfate assimilation appears to be limited by lava oxidation and the release of sulfur-rich gas. {T}he identification of massive sulfide endowments on {M}ars is not possible from remote sensing data. {Y}et the results of this study aid to define regions for the potential occurrence of such mineral systems, which may be the large canyon systems {N}octis {L}abyrinthus and {V}alles {M}arineris, or the {H}esperian channel systems of {M}ars' highlands (e.g., {K}asei {V}alles), most of which have been periodically draped by mafic-ultramafic lavas.},
  keywords = {},
  booktitle = {},
  journal = {{I}carus},
  volume = {296},
  numero = {},
  pages = {257--274},
  ISSN = {0019-1035},
  year = {2017},
  DOI = {10.1016/j.icarus.2017.06.016},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070904},
}