Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago
Rhodoliths are spherical growths (coralline red algae) that contribute bioclasts to coastal dunes in the Gulf of California (Mexico) and the Canary Islands (North Atlantic). Pleistocene dunes on Maio and São Nicolau islands in the Cape Verde archipelago were studied to quantify rhodolith contributio...
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2013
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ftubristolcris:oai:research-information.bris.ac.uk:publications/8b127288-7e0c-45bf-aa30-2134d2666ebb 2024-01-28T10:07:48+01:00 Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago Johnson, Markes E. Baarli, B. Gudveig da Silva, Carlos M. Cachão, Mário Ramalho, Ricardo S. Ledesma-Vázquez, Jorge Mayoral, Eduardo J. Santos, Ana 2013-03 https://hdl.handle.net/1983/8b127288-7e0c-45bf-aa30-2134d2666ebb https://research-information.bris.ac.uk/en/publications/8b127288-7e0c-45bf-aa30-2134d2666ebb https://doi.org/10.1016/j.aeolia.2012.10.008 http://www.scopus.com/inward/record.url?scp=84869238551&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Johnson , M E , Baarli , B G , da Silva , C M , Cachão , M , Ramalho , R S , Ledesma-Vázquez , J , Mayoral , E J & Santos , A 2013 , ' Coastal dunes with high content of rhodolith (coralline red algae) bioclasts : Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago ' , Aeolian Research , vol. 8 , pp. 1-9 . https://doi.org/10.1016/j.aeolia.2012.10.008 Canary Islands Cape verde islands Carbonate dunes Macaronesia Northeast trade winds Rhodoliths (coralline red algae) article 2013 ftubristolcris https://doi.org/10.1016/j.aeolia.2012.10.008 2024-01-04T23:45:21Z Rhodoliths are spherical growths (coralline red algae) that contribute bioclasts to coastal dunes in the Gulf of California (Mexico) and the Canary Islands (North Atlantic). Pleistocene dunes on Maio and São Nicolau islands in the Cape Verde archipelago were studied to quantify rhodolith contribution relative to other sources. Near Pilão Cão on Maio, a transverse dune at Lomba Greija covers 0.3km 2 , exposing stoss slopes that dip 8°-10° NE and leeward slip faces that dip 28°-32° SW and SE. Point counts on thin-section samples show that basalt and other non-carbonate materials account for 5%, on average, whereas fine matrix and voided space (dissolved grains) account for 67%. Among remaining identifiable bioclasts (coralline red algae, mollusks, corals, foraminifera, and echinoderms), rhodolith grains with an average diameter of 0.5mm account for 74%. Near Carriçal at Covoadinha de Chacina on the SE coast of São Nicolau, the stoss slope dips 8° SE for 70-80m on narrow longitudinal dunes. Point counts on a thin-section sample taken 2.5m above basement rock, reveal that basalt and other non-carbonate materials account for 10%, on average, whereas fine matrix and voided spaces account for 60%. Among identifiable bioclasts from the remainder (coralline red algae, mollusks, echinoderms, and bryozoa), rhodolith grains ranging in size from 0.5 to 1mm account for 96%. Potential enrichment from coralline red algae may be overlooked in coastal dunes, because content normally is described as dominated by mollusk shells, the tests from abundant foraminifera, and/or ooids. Article in Journal/Newspaper North Atlantic University of Bristol: Bristol Research Aeolian Research 8 1 9 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
topic |
Canary Islands Cape verde islands Carbonate dunes Macaronesia Northeast trade winds Rhodoliths (coralline red algae) |
spellingShingle |
Canary Islands Cape verde islands Carbonate dunes Macaronesia Northeast trade winds Rhodoliths (coralline red algae) Johnson, Markes E. Baarli, B. Gudveig da Silva, Carlos M. Cachão, Mário Ramalho, Ricardo S. Ledesma-Vázquez, Jorge Mayoral, Eduardo J. Santos, Ana Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago |
topic_facet |
Canary Islands Cape verde islands Carbonate dunes Macaronesia Northeast trade winds Rhodoliths (coralline red algae) |
description |
Rhodoliths are spherical growths (coralline red algae) that contribute bioclasts to coastal dunes in the Gulf of California (Mexico) and the Canary Islands (North Atlantic). Pleistocene dunes on Maio and São Nicolau islands in the Cape Verde archipelago were studied to quantify rhodolith contribution relative to other sources. Near Pilão Cão on Maio, a transverse dune at Lomba Greija covers 0.3km 2 , exposing stoss slopes that dip 8°-10° NE and leeward slip faces that dip 28°-32° SW and SE. Point counts on thin-section samples show that basalt and other non-carbonate materials account for 5%, on average, whereas fine matrix and voided space (dissolved grains) account for 67%. Among remaining identifiable bioclasts (coralline red algae, mollusks, corals, foraminifera, and echinoderms), rhodolith grains with an average diameter of 0.5mm account for 74%. Near Carriçal at Covoadinha de Chacina on the SE coast of São Nicolau, the stoss slope dips 8° SE for 70-80m on narrow longitudinal dunes. Point counts on a thin-section sample taken 2.5m above basement rock, reveal that basalt and other non-carbonate materials account for 10%, on average, whereas fine matrix and voided spaces account for 60%. Among identifiable bioclasts from the remainder (coralline red algae, mollusks, echinoderms, and bryozoa), rhodolith grains ranging in size from 0.5 to 1mm account for 96%. Potential enrichment from coralline red algae may be overlooked in coastal dunes, because content normally is described as dominated by mollusk shells, the tests from abundant foraminifera, and/or ooids. |
format |
Article in Journal/Newspaper |
author |
Johnson, Markes E. Baarli, B. Gudveig da Silva, Carlos M. Cachão, Mário Ramalho, Ricardo S. Ledesma-Vázquez, Jorge Mayoral, Eduardo J. Santos, Ana |
author_facet |
Johnson, Markes E. Baarli, B. Gudveig da Silva, Carlos M. Cachão, Mário Ramalho, Ricardo S. Ledesma-Vázquez, Jorge Mayoral, Eduardo J. Santos, Ana |
author_sort |
Johnson, Markes E. |
title |
Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago |
title_short |
Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago |
title_full |
Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago |
title_fullStr |
Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago |
title_full_unstemmed |
Coastal dunes with high content of rhodolith (coralline red algae) bioclasts:Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago |
title_sort |
coastal dunes with high content of rhodolith (coralline red algae) bioclasts:pleistocene formations on maio and são nicolau in the cape verde archipelago |
publishDate |
2013 |
url |
https://hdl.handle.net/1983/8b127288-7e0c-45bf-aa30-2134d2666ebb https://research-information.bris.ac.uk/en/publications/8b127288-7e0c-45bf-aa30-2134d2666ebb https://doi.org/10.1016/j.aeolia.2012.10.008 http://www.scopus.com/inward/record.url?scp=84869238551&partnerID=8YFLogxK |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Johnson , M E , Baarli , B G , da Silva , C M , Cachão , M , Ramalho , R S , Ledesma-Vázquez , J , Mayoral , E J & Santos , A 2013 , ' Coastal dunes with high content of rhodolith (coralline red algae) bioclasts : Pleistocene formations on Maio and São Nicolau in the Cape Verde archipelago ' , Aeolian Research , vol. 8 , pp. 1-9 . https://doi.org/10.1016/j.aeolia.2012.10.008 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.aeolia.2012.10.008 |
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Aeolian Research |
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