@article{fdi:010037720,
  title = {{S}tructure of the {M}alpelo {R}idge ({C}olombia) from seismic and gravity modelling},
  author = {{M}arcaillou, {B}oris and {C}harvis, {P}hilippe and {C}ollot, {J}ean-{Y}ves},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ide-angle and multichannel seismic data collected on the {M}alpelo {R}idge provide an image of the deep structure of the ridge and new insights on its emplacement and tectonic history. {T}he crustal structure of the {M}alpelo {R}idge shows a 14 km thick asymmetric crustal root with a smooth transition to the oceanic basin southeastward, whereas the transition is abrupt beneath its northwestern flank. {C}rustal thickening is mainly related to the thickening of the lower crust, which exhibits velocities from 6.5 to 7.4 km/s. {T}he deep structure is consistent with emplacement at an active spreading axis under a hotspot like the present-day {G}alapagos {H}otspot on the {C}ocos-{N}azca {S}preading {C}entre. {O}ur results favour the hypothesis that the {M}alpelo {R}idge was formerly a continuation of the {C}ocos {R}idge, emplaced simultaneously with the {C}arnegie {R}idge at the {C}ocos-{N}azca {S}preading {C}entre, from which it was separated and subsequently drifted southward relative to the {C}ocos {R}idge due to differential motion along the dextral strike-slip {P}anama {F}racture {Z}one. {T}he steep faulted northern flank of the {M}alpelo {R}idge and the counterpart steep and faulted southern flank of {R}egina {R}idge are possibly related to a rifting phase that resulted in the {C}oiba {M}icroplate's separation from the {N}azca {P}late along the {S}andra {R}ift.},
  keywords = {{M}alpelo {R}idge ; {G}alapagos hot spot ; {C}ocos {N}azca {S}preading {C}entre ; wide angle seismic ; multichanel seismic},
  booktitle = {},
  journal = {{M}arine {G}eophysical {R}esearches},
  volume = {27},
  numero = {4},
  pages = {289--300},
  ISSN = {0025-3235},
  year = {2006},
  DOI = {10.1007/s11001-006-9009-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010037720},
}