@article{PAR00014888,
  title = {{A}re adakites slab melts or high-pressure fractionated mantle melts ?},
  author = {{R}ibeiro, {J}. {M}. and {M}aury, {R}. {C}. and {G}r{\'e}goire, {M}ichel},
  editor = {},
  language = {{ENG}},
  abstract = {{A}dakites are unusual felsic igneous rocks commonly associated with asthenospheric slab window opening or fast subduction of a young (<25 {M}a) oceanic plate that may allow slab melting at shallow depths. {T}heir genesis has been extensively debated, as they are also observed in other geodynamic settings where thermal models do not predict slab melting in the fore-arc region. {H}ere, we present a new approach that provides new constraints on adakite petrogenesis in hot subduction zones (e.g. the {P}hilippines) and above an asthenospheric window (e.g. {B}aja {C}alifornia, {M}exico). {W}e use amphibole compositions to estimate magma storage depths and the composition of the host melts to test the hypothesis that adakites are pristine slab melts. {W}e find that adakites from the {P}hilippines and {B}aja {C}alifornia fore-arcs formed in two distinct petrogenetic scenarios: in the {P}hilippines, water-rich mantle melts stalled and crystallized within lower and upper crustal magma storage regions to produce silica-rich melts with an adakitic signature; in {B}aja {C}alifornia, slab melts that percolated through the mantle wedge mixed or mingled with water-rich mantle melts within a lower crustal (similar to 30km depth) magma storage region before stalling in the upper arc crust (similar to 7-15km depth). {A}lternatively, the {B}aja {C}alifornia adakites may represent mixing products between high-pressure differentiated mantle melts and mantle melts in a lower crustal magma reservoir, periodically refluxed by mantle melts. {T}hus, slab melting is not necessarily required to produce an adakitic geochemical fingerprint in hot subduction zones. {T}he hot downgoing plate may cross the 'adakitic window' and melt in specific geodynamic settings such as the opening of a slab tear, as beneath {B}aja {C}alifornia.},
  keywords = {adakite ; amphibole ; slab melt ; mantle melt ; {P}hilippines ; {B}aja {C}alifornia ; magma mixing ; fractionation ; geothermobarometry ; {PHILIPPINES} ; {CALIFORNIE} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{J}ournal of {P}etrology},
  volume = {57},
  numero = {5},
  pages = {839--862},
  ISSN = {0022-3530},
  year = {2016},
  DOI = {10.1093/petrology/egw023},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00014888},
}