@article{fdi:010054292,
  title = {{M}odern-style plate subduction preserved in the {P}alaeoproterozoic {W}est {A}frican craton},
  author = {{G}anne, {J}{\'e}r{\^o}me and {D}e {A}ndrade, {V}. and {W}einberg, {R}.{F}. and {V}idal, {O}. and {D}ubacq, {B}. and {K}agambega, {N}. and {N}aba, {S}. and {B}aratoux, {L}enka and {J}essell, {M}ark and {A}llibon, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he timing of onset of modern-style plate tectonics is debated. {T}he apparent lack of blueschist metamorphism(1)-a key indicator of modern plate subduction(2)-in rocks aged more than about 1 billion years calls into question the existence of plate tectonics during the {A}rchaean and {P}alaeoproterozoic eras(3,4). {I}nstead, plate tectonics and subduction could have either not occurred at that time(5), or could have proceeded differently(6) owing to warmer conditions in the early {E}arth mantle(7). {H}ere we use thermodynamic models(8-10) to investigate the formation conditions of metamorphic minerals in the 2.2-2.0 {G}yr old {W}est {A}frican metamorphic province. {W}e find a record of blueschist metamorphism in these rocks. {W}e show that minerals such as chlorite and phengite formed at high pressures of 10-12 kbar, low temperatures of 400-450 degrees {C} and under a geothermal gradient of 10-12 degrees {C} km(-1). {T}hese conditions are typical of modern subduction zones. {W}e therefore suggest that modern-style plate tectonics existed during the {P}alaeoproterozoic era. {W}e conclude that ancient blueschist metamorphism may exist in other parts of the world, but the identification of these rocks has so far been hampered by methodological problems associated with deciphering their pressure and temperature evolution.},
  keywords = {{AFRIQUE} {DE} {L}'{OUEST} ; {BURKINA} {FASO}},
  booktitle = {},
  journal = {{N}ature {G}eoscience},
  volume = {5},
  numero = {1},
  pages = {60--65},
  ISSN = {1752-0894},
  year = {2012},
  DOI = {10.1038/ngeo1321},
  URL = {https://www.documentation.ird.fr/hor/fdi:010054292},
}