Morphodynamics of supercritical turbidity currents in the channel-lobe transition zone
Morphodynamics of supercritical turbidity currents in the channel-lobe transition zone
This study aims to resolve process-facies links at both bed and environmental scales for the channel lobe transition zone (CLTZ). Data comes from existing experimental and modern CLTZ studies and from new outcrop studies. The experiments show that the CLTZ architecture of supercritical turbidity currents is complex and different from their counterparts where flows are subcritical throughout. Supercritical CLTZ’s are characterised by erosive channels formed by supercritical turbidity currents, by offset stacked lobes deposited from subcritical turbidity currents and by hydraulic jump related mouth bar deposits and upslope onlapping backfill deposits at the down slope end of the transition zone. Erosive channels and backfill features can be resolved by high resolution seismic data, yet evidence for supercritical flow must come from facies analysis of core data. Outcrop examples of the CLTZ from the Tabernas submarine fan (SE Spain) and the Llorenç del Munt deep-water delta slope (N. Spain) are used to establish such links between seismic scale architecture and facies recognised in cores. The outcrops described here were mapped as transition zone, and show 100 m sized, spoon-shaped scours filled with sediment containing sandy to gravelly backsets up to 4 m in height. Their facies and architecture is indicative of deposition by hydraulic jumps, can be recognized from cores, and is a good proxy for further predicting CLTZ architecture constructed by supercritical turbidity currents.
CLTZ, Super-critical turbidity currents, Submarine fan, Backset, Flutes
469-478
Postma, George
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Hoyal, David C.
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Abreu, Vitor
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Cartigny, Matthieu J.B.
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Demco, Timothy
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Fedele, Juan J.
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Kleverlaan, Kick
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Pederson, Keriann H.
c4b223da-5094-4636-8d09-5a337ed280e0
2016
Postma, George
9f590b3e-32fb-4959-b63b-d25dc07c4463
Hoyal, David C.
777162f2-d669-48ad-9a13-fc49f93c1697
Abreu, Vitor
8ba81ae4-2797-4931-a5f9-c22d9fb42e0a
Cartigny, Matthieu J.B.
d252d7b1-16c6-47b1-bf86-8087070934ce
Demco, Timothy
28d2e910-7b86-41e1-8f9e-5b56dda25b2d
Fedele, Juan J.
b1c8e8e6-abbd-4350-8ab9-f695325d265e
Kleverlaan, Kick
6d888202-9752-485b-916c-d4c04e57a936
Pederson, Keriann H.
c4b223da-5094-4636-8d09-5a337ed280e0
Postma, George, Hoyal, David C., Abreu, Vitor, Cartigny, Matthieu J.B., Demco, Timothy, Fedele, Juan J., Kleverlaan, Kick and Pederson, Keriann H.
(2016)
Morphodynamics of supercritical turbidity currents in the channel-lobe transition zone.
In,
Lamarche, Geoffroy, Mountjoy, Joshu, Bull, Suzanne, Hubble, Tom, Krastel, Sebastian, Lane, Emily, Micallef, Aaron, Moscardelli, Lorena, Mueller, Christof, Pecher, Ingo and Woelz, Susanne
(eds.)
Submarine Mass Movements and their Consequences: 7th International Symposium.
(Advances in Natural and Technological Hazards Research, 41)
Cham, CH.
Springer Cham, .
(doi:10.1007/978-3-319-20979-1_47).
Record type:
Book Section
Abstract
This study aims to resolve process-facies links at both bed and environmental scales for the channel lobe transition zone (CLTZ). Data comes from existing experimental and modern CLTZ studies and from new outcrop studies. The experiments show that the CLTZ architecture of supercritical turbidity currents is complex and different from their counterparts where flows are subcritical throughout. Supercritical CLTZ’s are characterised by erosive channels formed by supercritical turbidity currents, by offset stacked lobes deposited from subcritical turbidity currents and by hydraulic jump related mouth bar deposits and upslope onlapping backfill deposits at the down slope end of the transition zone. Erosive channels and backfill features can be resolved by high resolution seismic data, yet evidence for supercritical flow must come from facies analysis of core data. Outcrop examples of the CLTZ from the Tabernas submarine fan (SE Spain) and the Llorenç del Munt deep-water delta slope (N. Spain) are used to establish such links between seismic scale architecture and facies recognised in cores. The outcrops described here were mapped as transition zone, and show 100 m sized, spoon-shaped scours filled with sediment containing sandy to gravelly backsets up to 4 m in height. Their facies and architecture is indicative of deposition by hydraulic jumps, can be recognized from cores, and is a good proxy for further predicting CLTZ architecture constructed by supercritical turbidity currents.
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More information
Published date: 2016
Keywords:
CLTZ, Super-critical turbidity currents, Submarine fan, Backset, Flutes
Organisations:
Marine Geoscience
Identifiers
Local EPrints ID: 401571
URI: http://eprints.soton.ac.uk/id/eprint/401571
PURE UUID: 4c54d647-31c6-4097-a0d1-e2eb5d4ccd3b
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Date deposited: 13 Oct 2016 15:36
Last modified: 15 Mar 2024 02:50
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Contributors
Author:
George Postma
Author:
David C. Hoyal
Author:
Vitor Abreu
Author:
Matthieu J.B. Cartigny
Author:
Timothy Demco
Author:
Juan J. Fedele
Author:
Kick Kleverlaan
Author:
Keriann H. Pederson
Editor:
Geoffroy Lamarche
Editor:
Joshu Mountjoy
Editor:
Suzanne Bull
Editor:
Tom Hubble
Editor:
Sebastian Krastel
Editor:
Emily Lane
Editor:
Aaron Micallef
Editor:
Lorena Moscardelli
Editor:
Christof Mueller
Editor:
Ingo Pecher
Editor:
Susanne Woelz
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