Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula
Abstract Interplay of deep‐water sedimentary processes is responsible for building a myriad of features and deposits across mixed turbidite–contourite systems, from <5 cm beds to >200 km long sedimentary drifts. Investigations of the spatial and temporal variability of their sedimentary facies...
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crwiley:10.1111/sed.12978 2024-09-15T17:47:31+00:00 Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula Rodrigues, Sara Hernández‐Molina, Francisco Javier Hillenbrand, Claus‐Dieter Lucchi, Renata G. Rodríguez‐Tovar, Francisco J. Rebesco, Michele Larter, Robert D. Valdez, Victoria British Antarctic Survey Junta de Andalucía 2022 http://dx.doi.org/10.1111/sed.12978 https://onlinelibrary.wiley.com/doi/pdf/10.1111/sed.12978 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/sed.12978 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Sedimentology volume 69, issue 4, page 1953-1991 ISSN 0037-0746 1365-3091 journal-article 2022 crwiley https://doi.org/10.1111/sed.12978 2024-07-23T04:12:17Z Abstract Interplay of deep‐water sedimentary processes is responsible for building a myriad of features and deposits across mixed turbidite–contourite systems, from <5 cm beds to >200 km long sedimentary drifts. Investigations of the spatial and temporal variability of their sedimentary facies and facies associations is crucial to reveal the dynamics between along‐slope bottom currents and down‐slope turbidity currents, as well as their impact on drift construction and channel erosion. This study focuses on extensive modern mixed (turbidite–contourite) systems, developed across the continental rise of the Pacific margin of the Antarctic Peninsula. Nine sediment cores were sampled and analysed, through grain size and geochemical methods, to study the sedimentary facies at high‐resolution ( ca 1 to 20 cm). Three main facies associations have been identified across distinct morphological features (i.e. mounded drifts and trunk channels), comprising intercalations of hemipelagites, bottom current reworked sands (which include fine to coarse‐grained contourites) and gravitational facies (turbidites and mass‐transport deposits). These facies associations reflect fluctuations of the background sedimentation, oscillations of the bottom‐current velocity and of the frequency of gravity‐driven currents. The sedimentary record features cyclic alternations during the Late Quaternary (>99 kyr), suggesting that variations between along‐slope bottom currents and down‐slope turbidity currents are strongly linked to glacial–interglacial cycles during Marine Isotope Stages 1 to 6. Sedimentary records affected by bottom currents on polar margins, such as those of the Antarctic Peninsula, are essential to decipher the facies and facies sequences of bottom‐current deposits, as the low degree of bioturbation throughout most of the sediments allows us to observe the original sedimentary structures, which are poorly preserved in similar deposits from other continental margins. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Wiley Online Library Sedimentology |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Interplay of deep‐water sedimentary processes is responsible for building a myriad of features and deposits across mixed turbidite–contourite systems, from <5 cm beds to >200 km long sedimentary drifts. Investigations of the spatial and temporal variability of their sedimentary facies and facies associations is crucial to reveal the dynamics between along‐slope bottom currents and down‐slope turbidity currents, as well as their impact on drift construction and channel erosion. This study focuses on extensive modern mixed (turbidite–contourite) systems, developed across the continental rise of the Pacific margin of the Antarctic Peninsula. Nine sediment cores were sampled and analysed, through grain size and geochemical methods, to study the sedimentary facies at high‐resolution ( ca 1 to 20 cm). Three main facies associations have been identified across distinct morphological features (i.e. mounded drifts and trunk channels), comprising intercalations of hemipelagites, bottom current reworked sands (which include fine to coarse‐grained contourites) and gravitational facies (turbidites and mass‐transport deposits). These facies associations reflect fluctuations of the background sedimentation, oscillations of the bottom‐current velocity and of the frequency of gravity‐driven currents. The sedimentary record features cyclic alternations during the Late Quaternary (>99 kyr), suggesting that variations between along‐slope bottom currents and down‐slope turbidity currents are strongly linked to glacial–interglacial cycles during Marine Isotope Stages 1 to 6. Sedimentary records affected by bottom currents on polar margins, such as those of the Antarctic Peninsula, are essential to decipher the facies and facies sequences of bottom‐current deposits, as the low degree of bioturbation throughout most of the sediments allows us to observe the original sedimentary structures, which are poorly preserved in similar deposits from other continental margins. |
author2 |
Valdez, Victoria British Antarctic Survey Junta de Andalucía |
format |
Article in Journal/Newspaper |
author |
Rodrigues, Sara Hernández‐Molina, Francisco Javier Hillenbrand, Claus‐Dieter Lucchi, Renata G. Rodríguez‐Tovar, Francisco J. Rebesco, Michele Larter, Robert D. |
spellingShingle |
Rodrigues, Sara Hernández‐Molina, Francisco Javier Hillenbrand, Claus‐Dieter Lucchi, Renata G. Rodríguez‐Tovar, Francisco J. Rebesco, Michele Larter, Robert D. Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula |
author_facet |
Rodrigues, Sara Hernández‐Molina, Francisco Javier Hillenbrand, Claus‐Dieter Lucchi, Renata G. Rodríguez‐Tovar, Francisco J. Rebesco, Michele Larter, Robert D. |
author_sort |
Rodrigues, Sara |
title |
Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula |
title_short |
Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula |
title_full |
Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula |
title_fullStr |
Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula |
title_full_unstemmed |
Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula |
title_sort |
recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: the case of the pacific margin of the antarctic peninsula |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dx.doi.org/10.1111/sed.12978 https://onlinelibrary.wiley.com/doi/pdf/10.1111/sed.12978 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/sed.12978 |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Sedimentology volume 69, issue 4, page 1953-1991 ISSN 0037-0746 1365-3091 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/sed.12978 |
container_title |
Sedimentology |
_version_ |
1810496911633809408 |