@article{fdi:010042755,
  title = {{G}iant submarine collapse of a carbonate platform at the {T}uronian-{C}oniacian transition : the {A}yabacas {F}ormation, southern {P}eru},
  author = {{C}allot, {P}. and {S}emp{\'e}r{\'e}, {T}hierry and {O}donne, {F}. and {R}obert, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {A}yabacas {F}ormation of southern {P}eru is an impressive unit formed by the giant submarine collapse of the mid-{C}retaceous carbonate platform of the western {P}eru back-arc basin ({WPBAB}), near the {T}uronian-{C}oniacian transition (similar to 90-89 {M}a). {I}t extends along the southwestern edge of the {C}ordillera {O}riental and throughout the {A}ltiplano and {C}ordillera {O}ccidental over > 80 000 km(2) in map view, and represents a volume of displaced sediments of > 10 000 km(3). {T}he collapse occurred down the basin slope, i.e. toward the {SW}. {S}ix zones are characterised on the basis of deformational facies, and a seventh corresponds to the northeastern 'stable' area ({Z}one 0). {Z}ones 1-3 display increasing fragmentation from {NE} to {SW}, and are composed of limestone rafts and sheets embedded in a matrix of mainly red, partly calcareous and locally sandy, mudstones to siltstones. {I}n contrast, in {Z}ones 4 and 5 the unit consists only of displaced and stacked limestone masses forming a 'sedimentary thrust and fold system', with sizes increasing to the southwest. {I}n {Z}one 6, the upper part of the limestone succession consists of rafts and sheets stacked over the regularly bedded lower part. {T}he triggering of this extremely large mass wasting clearly ensued from slope creation, oversteepening and seismicity produced by extensional tectonic activity, as demonstrated by the observation of synsedimentary normal faults and related thickness variations. {O}ther factors, such as pore pressure increases or lithification contrasts probably facilitated sliding. {T}he key role of tectonics is strengthened by the specific relationships between the basin and collapse histories and two major fault systems that cross the study area. {T}he {A}yabacas collapse occurred at a turning point in the {C}entral {A}ndean evolution. {B}efore the event, the back-arc basin had been essentially marine and deepened to the west, with little volcanic activity taking place at the arc. {A}fter the event, the back-arc was occupied by continental to near-continental environments, and was bounded to the southwest by a massive volcanic arc shedding debris and tuffs into the basin.},
  keywords = {},
  booktitle = {},
  journal = {{B}asin {R}esearch},
  volume = {20},
  numero = {3},
  pages = {333--357},
  ISSN = {0950-091{X}},
  year = {2008},
  DOI = {10.1111/j.1365-2117.2008.00358.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042755},
}