@article{fdi:010074841,
  title = {{C}rustal exhumation during ongoing compression in the {V}ariscan {M}aures-{T}anneron {M}assif, {F}rance-{G}eological and thermo-mechanical aspects},
  author = {{G}erbault, {M}uriel and {S}chneider, {J}. and {R}everso-{P}eila, {A}. and {C}orsini, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {M}aures-{T}anneron {M}assif ({MTM}), together with {C}orsica and {S}ardinia, represent the {S}outheastern branch of the huge {E}uropean {V}ariscan belt. {A} continuous evolution from continental collision to exhumation is described from ca. 350 {M}a to ca. 320 {M}a, based on an extended compilation of available geological and geochronological data. {T}his geological compilation is complemented with thermo-mechanical modelling that tests the conditions under which deep-seated {HP} units can melt and exhume massively during continued convergence. {W}e simulate in two-dimensions the development of gravitational instabilities in a partially melting crust, depending on rheological layering and heat sources, and accounting for temperature dependent elasto-visco-plastic rheologies. {I}n order to reproduce {PT} exhumation patterns in the {MTM}, over the appropriate time-scale (>20 {M}y) and spatial extent (>100 km), a best fit was obtained with a convergence rate of 0.5 cm/yr and moderate diffusive surface processes. {T}he contribution of radiogenic heating in the pre-stacked felsic crustal units is crucial. {A} lateral alternation with mafic units is also required in order to prevent lateral spreading of the orogen. {A} low viscosity partially molten crust (10(20) {P}a.s, thus rather felsic) accompanies crustal exhumation in a decoupled mode from the deeper mantle. {A} shallow asthenosphere below the orogen ({LAB} at similar to 70 km depth, e.g. shallow slab breakoff) produces too warm and sudden exhumation as opposed to a competent mantle lithosphere (120 km depth {LAB}) that restrains it. {T}he {MTM} witnesses the typical competition between far-field plate convergence and internal body forces, and our study pleads for a progressive evolution of transpression towards perpendicular extension from ca. 320 {M}a.},
  keywords = {{V}ariscan orogeny ; {M}igmatites ; {C}rustal melting ; {T}hermomechanical modelling ; {P}ost-orogenic exhumation ; {G}ravitational instability ; {FRANCE} ; {MAURES} {TANNERON} {MASSIF}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {746},
  numero = {{S}pecial {I}ssue},
  pages = {439--458},
  ISSN = {0040-1951},
  year = {2018},
  DOI = {10.1016/j.tecto.2016.12.019},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074841},
}