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Daily bathymetric surveys document how stratigraphy is built and its extreme incompleteness in submarine channels

Vendettuoli, D.; Clare, M.A.; Hughes Clarke, J.E.; Vellinga, A.; Hizzet, J.; Hage, S.; Cartigny, M.J.B.; Talling, P.J.; Waltham, D.; Hubbard, S.M.; Stacey, C.; Lintern, D.G.

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Authors

D. Vendettuoli

M.A. Clare

J.E. Hughes Clarke

A. Vellinga

J. Hizzet

S. Hage

D. Waltham

S.M. Hubbard

C. Stacey

D.G. Lintern



Abstract

Turbidity currents are powerful flows of sediment that pose a hazard to critical seafloor infrastructure and transport globally important amounts of sediment to the deep sea. Due to challenges of direct monitoring, we typically rely on their deposits to reconstruct past turbidity currents. Understanding these flows is complicated because successive flows can rework or erase previous deposits. Hence, depositional environments dominated by turbidity currents, such as submarine channels, only partially record their deposits. But precisely how incomplete these deposits are, is unclear. Here we use the most extensive repeat bathymetric mapping yet of any turbidity current system, to reveal the stratigraphic evolution of three submarine channels. We re-analyze 93 daily repeat surveys performed over four months at the Squamish submarine delta, British Columbia in 2011, during which time >100 turbidity currents were monitored. Turbidity currents deposit and rework sediments into upstream-migrating bedforms, ensuring low rates of preservation (median 11%), even on the terminal lobes. Large delta-lip collapses (up to 150,000 m3) are relatively well preserved, however, due to their rapidly emplaced volumes, which shield underlying channel deposits from erosion over the surveyed timescale. The biggest gaps in the depositional record relate to infrequent powerful flows that cause significant erosion, particularly at the channel-lobe transition zone where no deposits during our monitoring period are preserved. Our analysis of repeat surveys demonstrates how incomplete the stratigraphy of submarine channels can be, even over just 4 months, and provides a new approach to better understand how the stratigraphic record is built and preserved in a wider range of marine settings.

Citation

Vendettuoli, D., Clare, M., Hughes Clarke, J., Vellinga, A., Hizzet, J., Hage, S., …Lintern, D. (2019). Daily bathymetric surveys document how stratigraphy is built and its extreme incompleteness in submarine channels. Earth and Planetary Science Letters, 515, 231-247. https://doi.org/10.1016/j.epsl.2019.03.033

Journal Article Type Article
Acceptance Date Mar 23, 2019
Online Publication Date Apr 4, 2019
Publication Date Jun 1, 2019
Deposit Date Apr 11, 2019
Publicly Available Date Mar 28, 2024
Journal Earth and Planetary Science Letters
Print ISSN 0012-821X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 515
Pages 231-247
DOI https://doi.org/10.1016/j.epsl.2019.03.033

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