Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago)
This project examines the role of tropical storms in the northeast Atlantic Ocean related to the post-mortem deposition of rhodoliths in coastal settings during Neogene to Holocene time with primary emphasis on Sal Island in the Cabo Verde Archipelago located 600 km off the coast of Senegal in north...
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ftmdpi:oai:mdpi.com:/2076-3263/10/11/419/ 2023-08-20T04:08:40+02:00 Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) Markes E. Johnson Ricardo Ramalho Carlos Marques da Silva agris 2020-10-23 application/pdf https://doi.org/10.3390/geosciences10110419 EN eng Multidisciplinary Digital Publishing Institute Sedimentology, Stratigraphy and Palaeontology https://dx.doi.org/10.3390/geosciences10110419 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 10; Issue 11; Pages: 419 coastal storm deposits wind-driven waves long-shore currents coralline red algae Text 2020 ftmdpi https://doi.org/10.3390/geosciences10110419 2023-08-01T00:20:06Z This project examines the role of tropical storms in the northeast Atlantic Ocean related to the post-mortem deposition of rhodoliths in coastal settings during Neogene to Holocene time with primary emphasis on Sal Island in the Cabo Verde Archipelago located 600 km off the coast of Senegal in northwest Africa. Fossil rhodoliths from 10 to 15 cm in diameter are equal in size to contemporary rhodoliths that survive for a century or more at water depths undisturbed by all but the most energetic storms. The shape of large rhodoliths makes them susceptible to rare disturbances with sufficient energy to export them beyond their preferred habitat into extreme environments that include supratidal settings. The methodology of this study gauges the relative sphericity of rhodoliths based on measurements across three axes perpendicular to one another, plots size variations on bar graphs, and considers whether or not individual nodules are nucleated around rock cores eroded from proximal rocky shores. Sal Island is impacted on a steady basis by wave swell generated from the Northeast Trade Winds, but Pleistocene and Holocene deposits with large rhodoliths on the Island’s windward coast are interpreted as the result of major storms of hurricane intensity. Comparison of Sal Island rhodoliths with Pliocene and Miocene examples from other insular localities in the Northeast Atlantic considers evidence for displacement of the Inter-Tropical Convergence Zone (ITCZ) into more northern latitudes as an influence on past hurricane tracks that are less common today. Text Northeast Atlantic MDPI Open Access Publishing Geosciences 10 11 419 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
coastal storm deposits wind-driven waves long-shore currents coralline red algae |
spellingShingle |
coastal storm deposits wind-driven waves long-shore currents coralline red algae Markes E. Johnson Ricardo Ramalho Carlos Marques da Silva Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) |
topic_facet |
coastal storm deposits wind-driven waves long-shore currents coralline red algae |
description |
This project examines the role of tropical storms in the northeast Atlantic Ocean related to the post-mortem deposition of rhodoliths in coastal settings during Neogene to Holocene time with primary emphasis on Sal Island in the Cabo Verde Archipelago located 600 km off the coast of Senegal in northwest Africa. Fossil rhodoliths from 10 to 15 cm in diameter are equal in size to contemporary rhodoliths that survive for a century or more at water depths undisturbed by all but the most energetic storms. The shape of large rhodoliths makes them susceptible to rare disturbances with sufficient energy to export them beyond their preferred habitat into extreme environments that include supratidal settings. The methodology of this study gauges the relative sphericity of rhodoliths based on measurements across three axes perpendicular to one another, plots size variations on bar graphs, and considers whether or not individual nodules are nucleated around rock cores eroded from proximal rocky shores. Sal Island is impacted on a steady basis by wave swell generated from the Northeast Trade Winds, but Pleistocene and Holocene deposits with large rhodoliths on the Island’s windward coast are interpreted as the result of major storms of hurricane intensity. Comparison of Sal Island rhodoliths with Pliocene and Miocene examples from other insular localities in the Northeast Atlantic considers evidence for displacement of the Inter-Tropical Convergence Zone (ITCZ) into more northern latitudes as an influence on past hurricane tracks that are less common today. |
format |
Text |
author |
Markes E. Johnson Ricardo Ramalho Carlos Marques da Silva |
author_facet |
Markes E. Johnson Ricardo Ramalho Carlos Marques da Silva |
author_sort |
Markes E. Johnson |
title |
Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) |
title_short |
Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) |
title_full |
Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) |
title_fullStr |
Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) |
title_full_unstemmed |
Storm-Related Rhodolith Deposits from the Upper Pleistocene and Recycled Coastal Holocene on Sal Island (Cabo Verde Archipelago) |
title_sort |
storm-related rhodolith deposits from the upper pleistocene and recycled coastal holocene on sal island (cabo verde archipelago) |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/geosciences10110419 |
op_coverage |
agris |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Geosciences; Volume 10; Issue 11; Pages: 419 |
op_relation |
Sedimentology, Stratigraphy and Palaeontology https://dx.doi.org/10.3390/geosciences10110419 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences10110419 |
container_title |
Geosciences |
container_volume |
10 |
container_issue |
11 |
container_start_page |
419 |
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1774721075158974464 |