@article{fdi:010069502,
  title = {{P}rimary magmas and mantle temperatures through time},
  author = {{G}anne, {J}{\'e}r{\^o}me and {F}eng, {X}iaojun},
  editor = {},
  language = {{ENG}},
  abstract = {{C}hemical composition of mafic magmas is a critical indicator of physicochemical conditions, such as pressure, temperature, and fluid availability, accompanying melt production in the mantle and its evolution in the continental or oceanic lithosphere. {R}ecovering this information has fundamental implications in constraining the thermal state of the mantle and the physics of mantle convection throughout the {E}arth's history. {H}ere a statistical approach is applied to a geochemical database of about 22,000 samples from the mafic magma record. {P}otential temperatures ({T}-ps) of the mantle derived from this database, assuming melting by adiabatic decompression and a {T}i-dependent ({F}e2{O}3/{T}i{O}2 - 0.5) or constant redox condition ({F}e2+/{S}igma {F}e= 0.9 or 0.8) in the magmatic source, are thought to be representative of different thermal "horizons' (or thermal heterogeneities) in the ambient mantle, ranging in depth from a shallow sublithospheric mantle ({T}-p minima) to a lower thermal boundary layer ({T}-p maxima). {T}he difference of temperature ({D}elta {T}-p) observed between {T}-p maxima and minima did not change significantly with time (similar to 170 degrees {C}). {C}onversely, a progressive but limited cooling of similar to 150 degrees {C} is proposed since similar to 2.5 {G}yr for the {E}arth's ambient mantle, which falls in the lower limit proposed by {H}erzberg et al. [ 2010] (similar to 15-250 degrees {C} hotter than today). {C}ooling of the ambient mantle after 2.5 {G}a is preceded by a high-temperature plateau evolution and a transition from dominant plumes to a plate tectonics geodynamic regime, suggesting that subductions stabilized temperatures in the {A}rchaean mantle that was in warming mode at that time.},
  keywords = {},
  booktitle = {},
  journal = {{G}eochemistry {G}eophysics {G}eosystems},
  volume = {18},
  numero = {3},
  pages = {872--888},
  ISSN = {1525-2027},
  year = {2017},
  DOI = {10.1002/2016gc006787},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069502},
}