@article{fdi:010049321,
  title = {{C}ontinental slope reconstruction after a giant mass failure, the example of the {M}atakaoa {M}argin, {N}ew {Z}ealand},
  author = {{J}oanne, {C}. and {C}ollot, {J}ean-{Y}ves and {L}amarche, {G}. and {M}igeon, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}uring the {P}leistocene, the {M}atakaoa {D}ebris {A}valanche ({MDA}) removed similar to 430 km(3) of material and formed a 50 km-long re-entrant in the {M}atakaoa margin, offshore {E}ast {C}ape, {N}ew {Z}ealand. {I}n this study, we examine the post-avalanche processes of continental slope reconstruction via the analysis of bathymetry, seismic-reflection data and one sediment core. {T}he study reconstructs the post-{MDA} history of the {M}atakaoa margin and reveals how the giant mass-transport event laid the foundation for present variations in the margin's morphology. {A}fter the {MDA}, 600 +/- 150 ka, the high terrigenous discharge of the {R}aukumara {P}eninsula rivers (>38 {M}t/yr at present) contributed to the construction of two depositional systems that each are up to 800 m thick: 1) the {P}leistocene {S}ediment {W}edge ({PSW}), resulting from detritic-rich hemipelagic sedimentation, partly reconstructed the slope and healed the western section of the {MDA} scarp; and 2) the {M}atakaoa {T}urbidite {S}ystem ({MTS}) developed at the outlet of the {M}atakaoa {C}anyon that is fed by the {W}aiapu {R}iver, and nestled against the eastern section of the {MDA} scarp. {I}n the eastern half of the re-entrant, the topography resulting from the avalanche included a 25 km-wide confined depocentre where the aggradational {MTS} started to construct through the development of a sediment fan and a turbidite plain. {T}he construction of these two architectural elements at the base of the continental slope lowered the slope angle which restrained further destabilization in the eastern half of the re-entrant. {I}n contrast, in the re-entrant's western half, slope reconstruction (deposition of {PSW}) has been counteracted by destabilization processes including: localized erosion associated with the headward development of slope canyons, and broad-scale failures resulting from differential compaction and gravity tectonics. {S}uch instability may have contributed to produce the similar to 1000 km(3) {M}atakaoa {D}ebris {F}low (38-100 ka). {O}ur analysis points out that a collapsed margin subject to high sedimentation rates is likely to undergo further mass-failures on the long-term (>300 ka).},
  keywords = {mass-transport deposit ; debris-avalanche ; slope failure ; slope ; reconstruction ; submarine instability ; turbidites},
  booktitle = {},
  journal = {{M}arine {G}eology},
  volume = {268},
  numero = {1-4},
  pages = {67--84},
  ISSN = {0025-3227},
  year = {2010},
  DOI = {10.1016/j.margeo.2009.10.013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049321},
}