Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain

Here we present the results of the study of two Lower Toarcian carbonate sections located in the Iberian Range of central Spain. Analyses of stable isotope on belemnite calcite allowed calculation of seawater palaeotemperature variations, which were compared with the stratigraphical distribution of...

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Detalles Bibliográficos
Autores: Gómez Fernández, Juan José, Arias Fernández, María Del Carmen
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/44363
Acceso en línea:https://hdl.handle.net/20.500.14352/44363
Access Level:acceso abierto
Palabra clave:565.33(234.1)
Palaeoclimate
Stable isotopes
Ostracods
Mass extinction
Early Toarcian
Paleontología
2416 Paleontología
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oai_identifier_str oai:docta.ucm.es:20.500.14352/44363
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repository_id_str
spelling Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central SpainGómez Fernández, Juan JoséArias Fernández, María Del Carmen565.33(234.1)PalaeoclimateStable isotopesOstracodsMass extinctionEarly ToarcianPaleontología2416 PaleontologíaHere we present the results of the study of two Lower Toarcian carbonate sections located in the Iberian Range of central Spain. Analyses of stable isotope on belemnite calcite allowed calculation of seawater palaeotemperature variations, which were compared with the stratigraphical distribution of ostracods. These organisms are particularly sensitive to ratios of temperature and salinity variations and hence are good indicators of climate changes. From a cooling interval, with seawater temperatures of 13.2 °C recorded at the Pliensbachian−Toarcian transition, seawater temperature began to rise in the lowermost Toarcian Tenuicostatum Zone, reaching average temperatures between 14.6 °C and 16.3 °C during the time of deposition of this Zone. Coinciding with this seawater warming, up to 85% of the ostracods species progressively disappeared during a period of approximately 300 kyr, marking the extinction interval. The extinction boundary, located around the Tenuicostatum−Serpentinum zonal boundary, coincides with a marked increase in temperature in the Serpentinum Zone, on which average seawater temperatures of 22 °C have been calculated. Warming continued through part of the Middle Toarcian Bifrons Zone, reaching average temperatures of 24.7 °C. Readjustment of the ostracod population allowed recovery of these faunas in the upper Serpentinum Zone, although the extinction of a major ostracod group, the healdioids, was also recorded. The correlation between mass extinction and warming infers a causal relationship. Comparison of the results with the records of stable isotopes in belemnites and in bulk carbonates, as well as TOC and facies analysis suggests that the anoxia linked to the Early Toarcian oceanic anoxic event was not the main responsible for the ostracod mass extinction.Elsevier Science B.V., Amsterdam.Universidad Complutense de Madrid20102010-01-0120102010-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/44363reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/443632026-06-02T12:44:21Z
dc.title.none.fl_str_mv Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
title Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
spellingShingle Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
Gómez Fernández, Juan José
565.33(234.1)
Palaeoclimate
Stable isotopes
Ostracods
Mass extinction
Early Toarcian
Paleontología
2416 Paleontología
title_short Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
title_full Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
title_fullStr Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
title_full_unstemmed Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
title_sort Rapid warming and ostracods mass extinction at the Lower Toarcian (Jurassic) of central Spain
dc.creator.none.fl_str_mv Gómez Fernández, Juan José
Arias Fernández, María Del Carmen
author Gómez Fernández, Juan José
author_facet Gómez Fernández, Juan José
Arias Fernández, María Del Carmen
author_role author
author2 Arias Fernández, María Del Carmen
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 565.33(234.1)
Palaeoclimate
Stable isotopes
Ostracods
Mass extinction
Early Toarcian
Paleontología
2416 Paleontología
topic 565.33(234.1)
Palaeoclimate
Stable isotopes
Ostracods
Mass extinction
Early Toarcian
Paleontología
2416 Paleontología
description Here we present the results of the study of two Lower Toarcian carbonate sections located in the Iberian Range of central Spain. Analyses of stable isotope on belemnite calcite allowed calculation of seawater palaeotemperature variations, which were compared with the stratigraphical distribution of ostracods. These organisms are particularly sensitive to ratios of temperature and salinity variations and hence are good indicators of climate changes. From a cooling interval, with seawater temperatures of 13.2 °C recorded at the Pliensbachian−Toarcian transition, seawater temperature began to rise in the lowermost Toarcian Tenuicostatum Zone, reaching average temperatures between 14.6 °C and 16.3 °C during the time of deposition of this Zone. Coinciding with this seawater warming, up to 85% of the ostracods species progressively disappeared during a period of approximately 300 kyr, marking the extinction interval. The extinction boundary, located around the Tenuicostatum−Serpentinum zonal boundary, coincides with a marked increase in temperature in the Serpentinum Zone, on which average seawater temperatures of 22 °C have been calculated. Warming continued through part of the Middle Toarcian Bifrons Zone, reaching average temperatures of 24.7 °C. Readjustment of the ostracod population allowed recovery of these faunas in the upper Serpentinum Zone, although the extinction of a major ostracod group, the healdioids, was also recorded. The correlation between mass extinction and warming infers a causal relationship. Comparison of the results with the records of stable isotopes in belemnites and in bulk carbonates, as well as TOC and facies analysis suggests that the anoxia linked to the Early Toarcian oceanic anoxic event was not the main responsible for the ostracod mass extinction.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01
2010
2010-01-01
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/20.500.14352/44363
url https://hdl.handle.net/20.500.14352/44363
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
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
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
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score 15,300719

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