Titre

Evolution of the Nile deep‐sea turbidite system during the Late Quaternary: influence of climate change on fan sedimentation

Année de publication

2009

Source

Sedimentology 56 2061 2090 7

ISSN
0037-0746
Résumé

This paper presents an overview of the evolution of the Nile deep‐sea turbidite system during the last 200 kyr, over a series of glacial to interglacial cycles. Six individual deep‐sea fans were identified from an extensive field data set. Each fan comprises a canyon, channel system and terminal lobes. Two of these fan systems were possibly active at the same time, at least during some periods. Large‐scale slope failures destroyed channel segments and caused the formation of new submarine fan systems. These slope failures thus played an important role in the overall evolution of the turbidite system. During the last glacial maximum (ca 25 to 14·8 ka) the central and eastern parts of the Nile deep‐sea turbidite system were relatively inactive. This inactivity corresponds to a lowstand in sea‐level, and a period of arid climate and relatively low sediment discharge from the Nile fluvial system. Rapid accumulation of fluvial flood‐derived deposits occurred across the shallower part of the submarine delta during sea‐level rise between ca 14·8 and 5 ka. The most recent deep‐sea channel–lobe system was very active during this period of rising sea‐level, which is also associated with a wetter continental climate and increased sediment and water discharge from the Nile. Increased sediment deposition in shallower water areas led to occasional large‐scale slope failure. The Nile deep‐sea turbidite system was largely inactive after ca 5 ka. This widespread inactivity is due to retreat of the coastline away from the continental shelf break, and to a more arid continental climate and reduced discharge of sediment from the Nile. The Nile deep‐sea turbidite system may be more active during periods of rising and high sea‐level associated with wetter climates, than during lowstands, and may rapidly become largely inactive during highstands in sea‐level coupled with arid periods. These acute responses to climate change have produced sedimentary/stratigraphic features that diverge from traditional sequence models in their nature and timing. This large‐scale sedimentary system responded to monsoon‐driven climate change and sea‐level change in a system‐wide and contemporaneous manner.

Type de publication
  • journal
Type de document
  • article
Classification
 
Classification - Inist-CNRS
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ecologie animale, vegetale et microbienne
Classification - Scopus
  • 1 - Physical Sciences
  • 2 - Earth and Planetary Sciences
  • 3 - Stratigraphy
  • 3 - Geology
Classification - Science Metrix
  • 1 - natural sciences
  • 2 - earth & environmental sciences
  • 3 - geology
Classification - Clarivate Analytics (Subject Category)
  • 1 - science
  • 2 - geology
Termes extraits

turbidite; facies; nile turbidite system; ducassou; sedimentology; journal compilation; sedimentologists; international association; sedimentation rates; uvial; nile; pluvial; quaternary; geol; sapropel; holocene; clastic; oods; lowstand; ecozone; sediment; highstand; mascle; loncke; eastern mediterranean; ruber; sedimentation; tectonics; lowstands; nabtian; mis3; levee; pelagic; turbidite systems; sealevel; turbidites; warne; mis4; mis5; sedimentary; mulder; nile river; glacial; turbidite system; quatern; mis2; stanley warne; sedimentary processes; mtcs; migeon; garziglia; early holocene; silt; bpsl; slope failures; saharan; piper; waelbroeck; eastern provinces; climatic; highstands; western province; deepsea; neonile; gasse; radiocarbon; carbonate; clast; depositional; mis6; sedimentary facies; arid periods; stratigraphy; antonioli; sediment supply; hemipelagic; anastomosing; maldonado; aapg; precipitation; tephra; continental slope; water discharge; lambeck; dsf4; ecozones; rotterdam; debrite; centimetre; aapg bull; balkema; alba; nile drainage basin; ocean drilling program; sediment discharge; shelf edge; pluvial periods; late quaternary; glacial stage; arid; uvial system; late holocene; summer monsoon; turbidite beds; continental climate; williams adamson; continental shelf; lambeck purcell; eastern province; white shoreline; adamson; pluvial period; hemipelagic muds; climate change; gasse street; right column; coarse sand; northern africa; prehistoric occupation; central province; rapid accumulation; upper part; quaternary environments; uvial sediment supply; traditional models; climatic conditions; arid period; nile delta; landslide; monsoon; deposition; wetter; numeral; dispersal; seismic; deposit; saharan pluvial; anastomosing river; high sedimentation rates; large rivers; piston cores; college station; drainage basin; northernmost part; arid climate; marine deposits; salt tectonics; pluvial phases; turbidite deposition; sediment cores; deepsea turbidite system; kolla perlmutter; sediment transfer; lowstand fans; older deposits; blum tornqvist; radiocarbon ages; uvial deposits; plant debris; african monsoon; global planet; saharan pluvial period; earth planet; channel beds; delta neonile; beta neonile; nile cone; nile margin; lobe

Entité nommée
 
Entité nommée - Emplacement géographique
  • Cherbourg
  • Chad
  • Mediterranean Sea
  • Bologna
  • France
  • Italy
  • Zurich
Entité nommée - Organisme
  • Malvern Instruments
  • Kley-France, Rueil
  • Second Leg Prismed II Scientific party.
  • the leg 155 Sedimentology Group
Entité nommée - Personne
Y. Balut; Ethiopian; Sahara Desert; G. Chabaud; M.E. Deptuck; D. Poirier; B. Martin; D.J.W. Piper; Nile; J. St; P.J. Talling; Rosetta Canyon
ark:/67375/WNG-RBQ3MPL6-8
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