The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction

Quantitative analysis of Late Pliensbachian–Early Toarcian calcareous nannofossil assemblages from the West Rodiles section (Asturias, Northern Spain) has been performed in order to interpret the paleoenvironmental changes that occurred during this time interval, characterized by a major extinction...

Descripción completa

Detalles Bibliográficos
Autores: Fraguas Herráez, Ángela Raquel, Comas Rengifo, María José, Gómez Fernández, Juan José, Goy Goy, Antonio
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:español
OAI Identifier:oai:docta.ucm.es:20.500.14352/42966
Acceso en línea:https://hdl.handle.net/20.500.14352/42966
Access Level:acceso abierto
Palabra clave:551.752.1 (460.12)
551.583 (460.12)
Calcareous nannofossils
Biotic crisis
Extinction event
Climate change
Early Toarcian
Asturias
Geología estratigráfica
Paleontología
2506.19 Estratigrafía
2416 Paleontología
id ES_ad324fe40cc8242fde74b7fdfc0a9831
oai_identifier_str oai:docta.ucm.es:20.500.14352/42966
network_acronym_str ES
network_name_str España
repository_id_str
spelling The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinctionFraguas Herráez, Ángela RaquelComas Rengifo, María JoséGómez Fernández, Juan JoséGoy Goy, Antonio551.752.1 (460.12)551.583 (460.12)Calcareous nannofossilsBiotic crisisExtinction eventClimate changeEarly ToarcianAsturiasGeología estratigráficaPaleontología2506.19 Estratigrafía2416 PaleontologíaQuantitative analysis of Late Pliensbachian–Early Toarcian calcareous nannofossil assemblages from the West Rodiles section (Asturias, Northern Spain) has been performed in order to interpret the paleoenvironmental changes that occurred during this time interval, characterized by a major extinction event, and especially around the Lower Toarcian Tenuicostatum/Serpentinum zonal and extinction boundary. Nannofossil data were statisti- cally treated: the Shannon diversity index was calculated, and results were compared to the stable isotope data and the total organic carbon content. To determine the changes recorded in the entire nannofossil communities, a principal component analysis was applied. During the latest Pliensbachian, the nannofossil assemblages were dominated by Schizosphaerella sp. and Tubirhabdus patulus, followed by the dominance of Calcivascularis jansae, taxa that probably thrived in rather cold waters. The progressive decrease in the relative abundances of both Schizosphaerella sp. and C. jansae coincides with a progressive increase in paleotemperatures during the extinc- tion interval, as indicated by the δ18O values measured on diagenetically screened belemnite calcite. Biscutum spp. dominated the nannofossil assemblages during the Early Toarcian Tenuicostatum Ammonite Zone, when seawaters were warm. In the West Rodiles section, the extinction boundary coincides with the deposition of the laminated shales, where especially high relative abundances of Calyculus spp. were recorded. After the extinction boundary, C. jansae becomes extinct, the relative abundance of Biscutum spp. sharply decreases, and the nannofossil assemblages become dominated by the Crepidolithus and Lotharingius species, which have been interpreted as opportunistic taxa. The Shannon Index fluctuates throughout the studied section, although it is especially high after the extinction boundary. The covariance between the nannofossil crisis and the evolu- tion of δ18Obel-based seawater paleotemperatures, as well as the fact that none of the explanations proposed by other authors seems to explain our observations, suggest a clear relationship between the increase in paleotemperature and the changes recorded in our nannofossil assemblages. Nevertheless, we do not discard possible changes in other paleoenvironmental parameters related or not to warmingElsevier Science B.V., Amsterdam.Universidad Complutense de Madrid20122012-01-0120122012-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/42966reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Españolspaopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttps://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/429662026-06-02T12:44:21Z
dc.title.none.fl_str_mv The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
title The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
spellingShingle The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
Fraguas Herráez, Ángela Raquel
551.752.1 (460.12)
551.583 (460.12)
Calcareous nannofossils
Biotic crisis
Extinction event
Climate change
Early Toarcian
Asturias
Geología estratigráfica
Paleontología
2506.19 Estratigrafía
2416 Paleontología
title_short The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
title_full The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
title_fullStr The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
title_full_unstemmed The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
title_sort The calcareous nannofossil crisis in Northern Spain (Asturias province) linked to the Early Toarcian warming-driven mass extinction
dc.creator.none.fl_str_mv Fraguas Herráez, Ángela Raquel
Comas Rengifo, María José
Gómez Fernández, Juan José
Goy Goy, Antonio
author Fraguas Herráez, Ángela Raquel
author_facet Fraguas Herráez, Ángela Raquel
Comas Rengifo, María José
Gómez Fernández, Juan José
Goy Goy, Antonio
author_role author
author2 Comas Rengifo, María José
Gómez Fernández, Juan José
Goy Goy, Antonio
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.752.1 (460.12)
551.583 (460.12)
Calcareous nannofossils
Biotic crisis
Extinction event
Climate change
Early Toarcian
Asturias
Geología estratigráfica
Paleontología
2506.19 Estratigrafía
2416 Paleontología
topic 551.752.1 (460.12)
551.583 (460.12)
Calcareous nannofossils
Biotic crisis
Extinction event
Climate change
Early Toarcian
Asturias
Geología estratigráfica
Paleontología
2506.19 Estratigrafía
2416 Paleontología
description Quantitative analysis of Late Pliensbachian–Early Toarcian calcareous nannofossil assemblages from the West Rodiles section (Asturias, Northern Spain) has been performed in order to interpret the paleoenvironmental changes that occurred during this time interval, characterized by a major extinction event, and especially around the Lower Toarcian Tenuicostatum/Serpentinum zonal and extinction boundary. Nannofossil data were statisti- cally treated: the Shannon diversity index was calculated, and results were compared to the stable isotope data and the total organic carbon content. To determine the changes recorded in the entire nannofossil communities, a principal component analysis was applied. During the latest Pliensbachian, the nannofossil assemblages were dominated by Schizosphaerella sp. and Tubirhabdus patulus, followed by the dominance of Calcivascularis jansae, taxa that probably thrived in rather cold waters. The progressive decrease in the relative abundances of both Schizosphaerella sp. and C. jansae coincides with a progressive increase in paleotemperatures during the extinc- tion interval, as indicated by the δ18O values measured on diagenetically screened belemnite calcite. Biscutum spp. dominated the nannofossil assemblages during the Early Toarcian Tenuicostatum Ammonite Zone, when seawaters were warm. In the West Rodiles section, the extinction boundary coincides with the deposition of the laminated shales, where especially high relative abundances of Calyculus spp. were recorded. After the extinction boundary, C. jansae becomes extinct, the relative abundance of Biscutum spp. sharply decreases, and the nannofossil assemblages become dominated by the Crepidolithus and Lotharingius species, which have been interpreted as opportunistic taxa. The Shannon Index fluctuates throughout the studied section, although it is especially high after the extinction boundary. The covariance between the nannofossil crisis and the evolu- tion of δ18Obel-based seawater paleotemperatures, as well as the fact that none of the explanations proposed by other authors seems to explain our observations, suggest a clear relationship between the increase in paleotemperature and the changes recorded in our nannofossil assemblages. Nevertheless, we do not discard possible changes in other paleoenvironmental parameters related or not to warming
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-01-01
2012
2012-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/42966
url https://hdl.handle.net/20.500.14352/42966
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
https://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier Science B.V., Amsterdam.
publisher.none.fl_str_mv Elsevier Science B.V., Amsterdam.
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869416419745071104
score 15,301629

Similares en LA Referencia