@article{fdi:010042318,
  title = {{P}ossible orogeny-parallel lower crustal flow and thickening in the {C}entral {A}ndes},
  author = {{G}erbault, {M}uriel and {M}artinod, {J}oseph and {H}{\'e}rail, {G}{\'e}rard},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he relatively low elevation and thick crust in the {A}ltiplano, in comparison to the higher elevation, but thinner crust in the {P}una plateau, together with geophysical data, suggests that isostatic equillibrium is achieved by cooler and denser lithospheric mantle in the {A}ltiplano. {E}xcess density in the {A}ltiplano mantle could create differential horizontal stress in the order of 25 {MP}a between both lithospheric columns. {N}umerical models accounting for pressure and temperature-dependent rheology show that such stress can induce horizontal ductile flow in the lower crust, from the {P}una towards the {A}ltiplano. {W}ith a minimum viscosity of 10(19) {P}a s, this flow reaches {I} cm/year, displacing more than 50 km of material within 5 {M}a. {I}f the lower crust viscosity is smaller, the amount of orogeny-parallel lower crustal flow can be even greater. {S}uch a mechanism of channel flow may explain that different amounts of crustal material have been accommodated by shortening in the {A}ltiplano and in the {P}una. {B}ecause of the strength of the elastic-brittle upper crust, this channel flow does not necessitate large amounts of surface deformation (except vertical uplift), making it difficult to detect from the geology. © 2005 {P}ublished by {E}lsevier {B}.{V}.},
  keywords = {orogeny ; isostasy ; lower crust flow ; mantle density ; {ANDES}},
  booktitle = {},
  journal = {{T}ectonophysics},
  volume = {399 (1-4) {S}pecial {I}ss. {SI}},
  numero = {},
  pages = {59--72},
  ISSN = {0040-1951},
  year = {2005},
  DOI = {10.1016/j.tecto.2004.12.015},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042318},
}