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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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2022
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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. |
format | Online Article Text |
id | pubmed-8769550 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
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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