Sea floor bedforms and their influence on slope accommodation (2019)

V Maselli (Corresponding Author), B Kneller, O. L. Taiwo, D Iacopini

Research output: Contribution to journalArticle

Abstract

In deep-water settings, the accommodation for sediment transported by turbidity flows relates to the difference between the elevation of the depositional surface and its equilibrium profile. As a consequence, accommodation creation, or disruption, may depend from changes in the physiography of the receiving basin, or changes in the flow properties. In topographically complex slopes, such where salt-withdrawal intra-slope basins occur, three different types of accommodation have been recognized. Among other parameters, the ratio between flow thickness and depth of the intra-slope basin controls the partial, or full, ponding of the sediment in suspension, and consequently, the lithology distribution within the deposit. On a smaller spatial scale, the behavior of bottom-hugging sediment-laden flows can be affected by topographic variations of the sea floor associated with the presence of km-scale bedforms. In this work, we show that ponded lobes accumulate on the convex-up stoss side of pre-existing large-wavelength bedforms (length up to 103, and height up to 102), and that their lithology distribution depends on the flow characteristics respect to the bedform height. In detail, when partial ponding of turbidity currents occurs, flow stripping promotes the accumulation of the coarse-grained fractions on the stoss side of the bedform, while the fine-grained cloud over-spills the lee side, affecting deposition basinward. By introducing the concept of stoss-side accommodation, this work suggests a new mechanism for the formation of ponded coarse-grained facies in slope settings due to the trapping effect large-wavelength bedforms with convex-up stoss sides.
Original languageEnglish
Pages (from-to)625-637
Number of pages13
JournalMarine and Petroleum Geology
Volume102
Early online date22 Jan 2019
DOIs
Publication statusPublished - Apr 2019

Fingerprint

accommodation
bedform
seafloor
slopes
sediments
turbidity
lithology
geomorphology
basin
sediment
wavelength
flow characteristics
deep water
stripping
wavelengths
lobes
turbidity current
trapping
deposits
salts

Keywords

  • Stoss-side accommodation
  • ponded lobes
  • turbidity currents
  • bedforms
  • Offshore Brazil
  • Turbidity currents
  • Bedforms
  • Ponded lobes
  • SEISMIC GEOMORPHOLOGY
  • SUBMARINE CANYONS
  • MASS-TRANSPORT
  • TURBIDITY CURRENTS
  • FAN
  • CHANNEL
  • HIGH-RESOLUTION
  • ARCHITECTURE
  • SEDIMENT WAVES
  • MONTEREY CANYON

ASJC Scopus subject areas

  • Economic Geology
  • Geology
  • Geophysics
  • Oceanography
  • Stratigraphy

Cite this

Sea floor bedforms and their influence on slope accommodation (2019). / Maselli, V (Corresponding Author); Kneller, B; Taiwo, O. L.; Iacopini, D.

In: Marine and Petroleum Geology, Vol. 102, 04.2019, p. 625-637.

Research output: Contribution to journalArticle

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abstract = "In deep-water settings, the accommodation for sediment transported by turbidity flows relates to the difference between the elevation of the depositional surface and its equilibrium profile. As a consequence, accommodation creation, or disruption, may depend from changes in the physiography of the receiving basin, or changes in the flow properties. In topographically complex slopes, such where salt-withdrawal intra-slope basins occur, three different types of accommodation have been recognized. Among other parameters, the ratio between flow thickness and depth of the intra-slope basin controls the partial, or full, ponding of the sediment in suspension, and consequently, the lithology distribution within the deposit. On a smaller spatial scale, the behavior of bottom-hugging sediment-laden flows can be affected by topographic variations of the sea floor associated with the presence of km-scale bedforms. In this work, we show that ponded lobes accumulate on the convex-up stoss side of pre-existing large-wavelength bedforms (length up to 103, and height up to 102), and that their lithology distribution depends on the flow characteristics respect to the bedform height. In detail, when partial ponding of turbidity currents occurs, flow stripping promotes the accumulation of the coarse-grained fractions on the stoss side of the bedform, while the fine-grained cloud over-spills the lee side, affecting deposition basinward. By introducing the concept of stoss-side accommodation, this work suggests a new mechanism for the formation of ponded coarse-grained facies in slope settings due to the trapping effect large-wavelength bedforms with convex-up stoss sides.",
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