Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions

During the greenhouse conditions prevailing in the early–middle Eocene, larger benthic foraminifers (LBF) spread out on carbonate platforms worldwide while rhodolith beds were scarcely represented. This reduction in rhodolith beds coincided with a relative decrease in coralline algal diver...

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Autores: Aguirre, Julio, Braga, Juan Carlos, Pujalte Navarro, Victoriano, Orue-Etxebarria Urkitza, Xabier, Salazar-Ortiz, Edward, Rincón-Martínez, Daniel, Abad, Manuel, Pérez-Valera, Fernando
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/42600
Acceso en línea:http://hdl.handle.net/10810/42600
Access Level:acceso abierto
Palabra clave:calcareous red algae
larger foraminifer lithofacies
Eocene
Southern Spain
Colombia
Dominican Republic
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spelling Middle Eocene Rhodoliths from Tropical and Mid-Latitude RegionsAguirre, JulioBraga, Juan CarlosPujalte Navarro, VictorianoOrue-Etxebarria Urkitza, XabierSalazar-Ortiz, EdwardRincón-Martínez, DanielAbad, ManuelPérez-Valera, Fernandocalcareous red algaelarger foraminifer lithofaciesEoceneSouthern SpainColombiaDominican RepublicDuring the greenhouse conditions prevailing in the early&ndash;middle Eocene, larger benthic foraminifers (LBF) spread out on carbonate platforms worldwide while rhodolith beds were scarcely represented. This reduction in rhodolith beds coincided with a relative decrease in coralline algal diversity and with a drastic decline of coral reef abundance. Middle Eocene rhodoliths from two tropical (San Jacinto Fold Belt in northern Colombia and Bahoruco Peninsula in the Dominican Republic) and two mid-latitude (Salinas Menores Ravine and Sierra del Zacat&iacute;n in Southern Spain) localities were studied. Rhodolith rudstones in the tropical areas accumulated on relatively deep (several tens of meters) platform environments and were also redeposited in deeper settings downslope. In Salinas Menores, rhodoliths are dispersed in planktic foraminifer-rich marls. Miliolids are common in the infilling of constructional voids in these rhodoliths, indicating that they originally grew in shallow-water inner-shelf settings and afterwards they were transported to deeper environments. In Sierra del Zacat&iacute;n, rhodoliths are scarce and coralline algae mainly occur as crusts attached to and intergrowing with corals. Here, LBF dominated shallow-water carbonate platforms. In terms of taxonomic composition, coralline algae of the order Hapalidiales are the most abundant in the study areas, followed by Sporolithales. The order Corallinales is poorly represented except in Salinas Menores, where it is relatively abundant and diverse. The impact of high temperatures due to high levels of atmospheric CO<sub>2</sub> during the Eocene and widespread oligotrophic conditions, which favored formation of LBF-rich lithofacies, might account for the low abundance of rhodolith beds at mid and high latitudes. In contrast, the more productive equatorial regions would have favored the formation of rhodolith beds.This research was funded by Research Group RNM-190 of the Junta de Andalucía (JA and JCB), MINECO/FEDER-UE project CGL2015-65404-R and by the Consolidated Research Group IT930-16 of the Basque Government (VP and XOE).MDPI2020202020202020info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/42600reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/grantAgreement/MINECO/CGL2015-65404-R/https://www.mdpi.com/1424-2818/12/3/117info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/3.0/es/© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)oai:addi.ehu.eus:10810/426002026-06-18T09:23:17Z
dc.title.none.fl_str_mv Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
title Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
spellingShingle Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
Aguirre, Julio
calcareous red algae
larger foraminifer lithofacies
Eocene
Southern Spain
Colombia
Dominican Republic
title_short Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
title_full Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
title_fullStr Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
title_full_unstemmed Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
title_sort Middle Eocene Rhodoliths from Tropical and Mid-Latitude Regions
dc.creator.none.fl_str_mv Aguirre, Julio
Braga, Juan Carlos
Pujalte Navarro, Victoriano
Orue-Etxebarria Urkitza, Xabier
Salazar-Ortiz, Edward
Rincón-Martínez, Daniel
Abad, Manuel
Pérez-Valera, Fernando
author Aguirre, Julio
author_facet Aguirre, Julio
Braga, Juan Carlos
Pujalte Navarro, Victoriano
Orue-Etxebarria Urkitza, Xabier
Salazar-Ortiz, Edward
Rincón-Martínez, Daniel
Abad, Manuel
Pérez-Valera, Fernando
author_role author
author2 Braga, Juan Carlos
Pujalte Navarro, Victoriano
Orue-Etxebarria Urkitza, Xabier
Salazar-Ortiz, Edward
Rincón-Martínez, Daniel
Abad, Manuel
Pérez-Valera, Fernando
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv calcareous red algae
larger foraminifer lithofacies
Eocene
Southern Spain
Colombia
Dominican Republic
topic calcareous red algae
larger foraminifer lithofacies
Eocene
Southern Spain
Colombia
Dominican Republic
description During the greenhouse conditions prevailing in the early&ndash;middle Eocene, larger benthic foraminifers (LBF) spread out on carbonate platforms worldwide while rhodolith beds were scarcely represented. This reduction in rhodolith beds coincided with a relative decrease in coralline algal diversity and with a drastic decline of coral reef abundance. Middle Eocene rhodoliths from two tropical (San Jacinto Fold Belt in northern Colombia and Bahoruco Peninsula in the Dominican Republic) and two mid-latitude (Salinas Menores Ravine and Sierra del Zacat&iacute;n in Southern Spain) localities were studied. Rhodolith rudstones in the tropical areas accumulated on relatively deep (several tens of meters) platform environments and were also redeposited in deeper settings downslope. In Salinas Menores, rhodoliths are dispersed in planktic foraminifer-rich marls. Miliolids are common in the infilling of constructional voids in these rhodoliths, indicating that they originally grew in shallow-water inner-shelf settings and afterwards they were transported to deeper environments. In Sierra del Zacat&iacute;n, rhodoliths are scarce and coralline algae mainly occur as crusts attached to and intergrowing with corals. Here, LBF dominated shallow-water carbonate platforms. In terms of taxonomic composition, coralline algae of the order Hapalidiales are the most abundant in the study areas, followed by Sporolithales. The order Corallinales is poorly represented except in Salinas Menores, where it is relatively abundant and diverse. The impact of high temperatures due to high levels of atmospheric CO<sub>2</sub> during the Eocene and widespread oligotrophic conditions, which favored formation of LBF-rich lithofacies, might account for the low abundance of rhodolith beds at mid and high latitudes. In contrast, the more productive equatorial regions would have favored the formation of rhodolith beds.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/42600
url http://hdl.handle.net/10810/42600
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/MINECO/CGL2015-65404-R/
https://www.mdpi.com/1424-2818/12/3/117
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/3.0/es/
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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