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How is a turbidite actually deposited?

The deposition of a classic turbidite by a surge-type turbidity current, as envisaged by conceptual models, is widely considered a discrete event of continuous sediment accumulation at a falling rate by the gradually waning density flow. Here, we demonstrate, on the basis of a high-resolution advanc...

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Autores principales: Ge, Zhiyuan, Nemec, Wojciech, Vellinga, Age J., Gawthorpe, Rob L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8769550/
https://www.ncbi.nlm.nih.gov/pubmed/35044818
http://dx.doi.org/10.1126/sciadv.abl9124
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author Ge, Zhiyuan
Nemec, Wojciech
Vellinga, Age J.
Gawthorpe, Rob L.
author_facet Ge, Zhiyuan
Nemec, Wojciech
Vellinga, Age J.
Gawthorpe, Rob L.
author_sort Ge, Zhiyuan
collection PubMed
description The deposition of a classic turbidite by a surge-type turbidity current, as envisaged by conceptual models, is widely considered a discrete event of continuous sediment accumulation at a falling rate by the gradually waning density flow. Here, we demonstrate, on the basis of a high-resolution advanced numerical CFD (computational fluid dynamics) simulation and rock-record examples, that the depositional event in reality involves many brief episodes of nondeposition. The reason is inherent hydraulic fluctuations of turbidity current energy driven by interfacial Kelvin-Helmholtz waves. The experimental turbidity current, with realistic grain-size composition of a natural turbidite, used only 26 to 33% of its in-place flow time for deposition, while the remaining time went to the numerous episodes of sediment bypass and transient erosion. The general stratigraphic notion of a gross incompleteness of sedimentary record may then extend down to the deposition time scale of a single turbidite.
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spelling pubmed-87695502022-02-01 How is a turbidite actually deposited? Ge, Zhiyuan Nemec, Wojciech Vellinga, Age J. Gawthorpe, Rob L. Sci Adv Earth, Environmental, Ecological, and Space Sciences The deposition of a classic turbidite by a surge-type turbidity current, as envisaged by conceptual models, is widely considered a discrete event of continuous sediment accumulation at a falling rate by the gradually waning density flow. Here, we demonstrate, on the basis of a high-resolution advanced numerical CFD (computational fluid dynamics) simulation and rock-record examples, that the depositional event in reality involves many brief episodes of nondeposition. The reason is inherent hydraulic fluctuations of turbidity current energy driven by interfacial Kelvin-Helmholtz waves. The experimental turbidity current, with realistic grain-size composition of a natural turbidite, used only 26 to 33% of its in-place flow time for deposition, while the remaining time went to the numerous episodes of sediment bypass and transient erosion. The general stratigraphic notion of a gross incompleteness of sedimentary record may then extend down to the deposition time scale of a single turbidite. American Association for the Advancement of Science 2022-01-19 /pmc/articles/PMC8769550/ /pubmed/35044818 http://dx.doi.org/10.1126/sciadv.abl9124 Text en Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Earth, Environmental, Ecological, and Space Sciences
Ge, Zhiyuan
Nemec, Wojciech
Vellinga, Age J.
Gawthorpe, Rob L.
How is a turbidite actually deposited?
title How is a turbidite actually deposited?
title_full How is a turbidite actually deposited?
title_fullStr How is a turbidite actually deposited?
title_full_unstemmed How is a turbidite actually deposited?
title_short How is a turbidite actually deposited?
title_sort how is a turbidite actually deposited?
topic Earth, Environmental, Ecological, and Space Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8769550/
https://www.ncbi.nlm.nih.gov/pubmed/35044818
http://dx.doi.org/10.1126/sciadv.abl9124
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