@article{fdi:010062283,
  title = {{A} fictitious domain method for lithosphere-asthenosphere interaction : application to periodic slab folding in the upper mantle},
  author = {{C}erpa, {N}. {G}. and {H}assani, {R}. and {G}erbault, {M}uriel and {P}revost, {J}. {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e present a new approach for the lithosphere-asthenosphere interaction in subduction zones. {T}he lithosphere is modeled as a {M}axwell viscoelastic body sinking in the viscous asthenosphere. {B}oth domains are discretized by the finite element method, and we use a staggered coupling method. {T}he interaction is provided by a nonmatching interface method called the fictitious domain method. {W}e describe a simplified formulation of this numerical technique and present 2-{D} examples and benchmarks. {W}e aim at studying the effect of mantle viscosity on the cyclicity of slab folding at the 660 km depth transition zone. {S}uch cyclicity has previously been shown to occur depending on the kinematics of both the overriding and subducting plates, in analog and numerical models that approximate the 660 km depth transition zone as an impenetrable barrier. {H}ere we applied far-field plate velocities corresponding to those of the {S}outh-{A}merican and {N}azca plates at present. {O}ur models show that the viscosity of the asthenosphere impacts on folding cyclicity and consequently on the slab's dip as well as the stress regime of the overriding plate. {V}alues of the mantle viscosity between 3 and 5 x 10(20) {P}a s are found to produce cycles similar to those reported for the {A}ndes, which are of the order of 30-40 {M}yr (based on magmatism and sedimentological records). {M}oreover, we discuss the episodic development of horizontal subduction induced by cyclic folding and, hence, propose a new explanation for episodes of flat subduction under the {S}outh-{A}merican plate.},
  keywords = {{AMERIQUE} {DU} {SUD} ; {PACIFIQUE} ; {ANDES}},
  booktitle = {},
  journal = {{G}eochemistry {G}eophysics {G}eosystems},
  volume = {15},
  numero = {5},
  pages = {1852--1877},
  ISSN = {1525-2027},
  year = {2014},
  DOI = {10.1002/2014gc005241},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062283},
}