@article{fdi:010083057,
  title = {{S}uccessive, large mass-transport deposits in the south {K}ermadec fore-arc basin, {N}ew {Z}ealand : the {M}atakaoa submarine instability complex},
  author = {{L}amarche, {G}. and {J}oanne, {C}. and {C}ollot, {J}ean-{Y}ves},
  editor = {},
  language = {{ENG}},
  abstract = {{F}our > 100 km(3) mass-transport deposits ({MTD}s) identified from their morphology and seismic facies across the {M}atakaoa {M}argin and {R}aukumara fore-arc basin, {NE} {N}ew {Z}ealand, constitute the {M}atakaoa {S}ubmarine {I}nstability {C}omplex ({MSIC}). {MSIC} originates from a 45-km-wide, 1100-m-high reentrant in the continental slope. {T}he deposits resulted from three mass-failure events: ( 1) {T}he {R}aukumara {S}lump is identified from the collapsed {NW} flank of an anticline at the northern end of the reentrant and imbricate structures at its distal end, overlying a flat decollement over a > 50-km distance. {T}he slump age is roughly estimated between upper {M}iocene and lower {P}leistocene. (2) {T}he {M}atakaoa {D}ebris {A}valanche ({MDA}) is subdivided into a similar to 260-km(3) blocky unit and a similar to 170-km(3) weakly reflective unit, overlying a highamplitude seismic reflector truncating the underlying sedimentary units. {T}he {MDA} is dated 600 +/- 150 ka. {I}t originated as a slump, as indicated by back-tilted blocks overlying a rotational failure surface, and evolved during transport as a debris avalanche. {T}he failure of sedimentary basement blocks released {P}lio-{P}leistocene shelf-basin infill, thus producing the blocky and weakly reflective units. {F}ore-arc basin sediments deformed in front of the {MDA} for approximately 20 km. (3) {T}he {M}atakaoa {D}ebris {F}low ({MDF}) occurred 38-100 ka ago and extends 200 km northward from the reentrant headwall and consists of a 150-m- thick layer with a chaotic seismic facies. {S}couring beneath the {MDF} and a < 250- m- high east bounding scarp indicate basal and lateral erosion associated with the flow displacement. {I}ncorporation of eroded material into the debris flow accounts for > 30% of the flow's 1250 km 3 volume. {F}actors facilitating failures include the following: slope oversteepening associated with margin uplift and fore-arc subsidence, large-scale folding related to shortening between the {P}acific and {A}ustralia plates, high-discharge rivers draining the region, and rapid sediment accumulation on the margin. {L}arge to great earthquakes along the plate interface are a likely trigger mechanism controlling the recurrence of large margin failures. {U}nlike other {MTD}s along plate boundaries, which are destined to be consumed into the subduction factory, the {MSIC} provides an opportunity to investigate mega- instabilities at an active margin over million year timescales.},
  keywords = {submarine landslide ; debris flow ; slump ; debris avalanche ; {R}aukumara {B}asin ; {H}ikurangi {M}argin ; {NOUVELLE} {ZELANDE} ; {KERMADEC}},
  booktitle = {},
  journal = {{G}eochemistry {G}eophysics {G}eosystems},
  volume = {9},
  numero = {art. no {Q}04001},
  pages = {{NIL}_57--{NIL}_86},
  ISSN = {1525-2027},
  year = {2008},
  DOI = {10.1029/2007{GC}001843},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083057},
}