@article{fdi:010074891,
  title = {{W}hen {P}roterozoic crusts became thick : new insights from magma petrology},
  author = {{G}anne, {J}{\'e}r{\^o}me and {F}eng, {X}. {J}. and {M}c{F}arlane, {H}. and {M}acouin, {M}. and {R}ousse, {S}onia and {N}aba, {S}. and {T}raore, {A}. and {H}odel, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {E}arth's continental crust represents the outermost envelope of the solid {E}arth, controlling exchanges within the geosphere and reflecting geodynamics processes. {O}ne of the fundamental issues of {E}arth {S}cience aims to determine crustal thickness in past geodynamic environments in order to discuss the evolution of certain geodynamic processes through time. {D}espite presenting a continuing challenge, the evolution of crustal thickness during the last 3 billion years can be investigated using indirect clues yielded by the chemical signature of mafic magmas and associated ferromagnesian minerals (pyroxene, amphibole). {H}ere, we present a new statistical assessment of a global database of magmatic and mineral chemical information. {A}nalysis reveals the increasing occurrence of high-temperature pyroxenes and amphiboles growing in {C}a-rich, {F}e-poor magma since similar to 1 {G}a, which contrasts with lower temperature conditions of minerals crystallization throughout the {M}eso- and {P}alaeoproterozoic times. {T}his is interpreted to reflect temporal changes in the control of {E}arth's crust on mantle-derived magma composition, related to changes in lithospheric thickness and mantle secular cooling. {W}e propose that thick existing crust is associated with deeper, hotter magmatic reservoirs, potentially elucidating the mineral chemistry and the contrasting iron content between primary and derivative mafic magmas. {B}ased on both the chemical and mineral information of mafic magma, an integrated approach provides qualitative estimates of past crustal thickness and associated magmatic systems. {O}ur findings indicate that the {P}roterozoic was characterized by thicker crustal sections (>40-50 km) relative to the {P}hanerozoic and {A}rchean (<35 km). {T}his period of crustal thickening appears at the confluence of major changes on {E}arth, marked by the onset of mantle cooling and {P}late {T}ectonics and the assembly of {C}olumbia, the first supercontinent.},
  keywords = {magma chemistry ; crustal thickness ; statistical petrology ; proterozoic},
  booktitle = {},
  journal = {{G}eosciences},
  volume = {8},
  numero = {12},
  pages = {art. 428 [21 ]},
  ISSN = {2076-3263},
  year = {2018},
  DOI = {10.3390/geosciences8120428},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074891},
}