Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)

The stable isotope composition (S’3C and S,80) of the laminae in three Quaternary, calcitic, tufa strom atolites of different ages (M IS6, M IS 5 a n d M IS1 ) in the Anamaza valley are studied and compared with the modern tufa in the Ahamaza river. The cyclic textural variations represent thick cya...

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Detalhes bibliográficos
Autores: Osácar, María Cinta, Arenas Abad, Concepción, Sancho, Carlos, Pardo, Gonzalo, Martín Bello, Leticia
Tipo de documento: artigo
Data de publicação:2017
País:España
Recursos:Universidad de Huelva (UHU)
Repositório:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglês
OAI Identifier:oai:ariasmontano.uhu.es:10272/14549
Acesso em linha:http://hdl.handle.net/10272/14549
Access Level:Acceso aberto
Palavra-chave:Stromatolite texture
Stable isotopes
Fluvial tufa
Pleistocene
Textura de estromatolitos
Isótopos estables
Tobas fluviales
Pleistoceno
Holoceno
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spelling Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)Los variaciones en ¡os isótopos estables de estromatolitos tobáceos cuaternarios del sistema fluvial del Añamaza (Cordillera Ibérica, España)Osácar, María CintaArenas Abad, ConcepciónSancho, CarlosPardo, GonzaloMartín Bello, LeticiaStromatolite textureStable isotopesFluvial tufaPleistocenePleistoceneTextura de estromatolitosIsótopos establesTobas fluvialesPleistocenoHolocenoThe stable isotope composition (S’3C and S,80) of the laminae in three Quaternary, calcitic, tufa strom atolites of different ages (M IS6, M IS 5 a n d M IS1 ) in the Anamaza valley are studied and compared with the modern tufa in the Ahamaza river. The cyclic textural variations represent thick cyanobacteria! growth in the light laminae and thin or absent cyanobacteria! growth in the dark laminae. The textural cyclicity is parallel to 8 180 changes: Each light-dark couplet corresponds to one year in which the light lamina (lower 8 ’80 values) represents warmer water temperatures (Tw) than the dark lamina (higher 8 ’80 values). This is consistent with the fact that the large crystals composing the dark laminae correspond to precipitation in the absence of microbial films and likely represent the coldest conditions. The 8 ,s0 ^ -derived Tw from M IS 5 stromatolite is higher than the MIS6 and MIS 1 samples, which agrees with the commonly admitted climatic conditions during MIS5 in NE Iberia. Moreover, S^O^mi Tw from MIS6 suggests a wider yearly Tw range than the two other samples. The higher a n d more disperse S ,3C values o f the M IS1 stromatolite are consisten t with the peculiarities o f the vegetal co ver a n d the de cre a se d w a ter availability in the HoloceneSociedad Geológica de España20172017-01-0120172017-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/14549reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/145492026-06-02T14:58:11Z
dc.title.none.fl_str_mv Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
Los variaciones en ¡os isótopos estables de estromatolitos tobáceos cuaternarios del sistema fluvial del Añamaza (Cordillera Ibérica, España)
title Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
spellingShingle Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
Osácar, María Cinta
Stromatolite texture
Stable isotopes
Fluvial tufa
Pleistocene
Pleistocene
Textura de estromatolitos
Isótopos estables
Tobas fluviales
Pleistoceno
Holoceno
title_short Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
title_full Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
title_fullStr Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
title_full_unstemmed Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
title_sort Stable-isotope changes in tufa stromatolites of the Quaternary Añamaza fluvial system (Iberian Ranges, Spain)
dc.creator.none.fl_str_mv Osácar, María Cinta
Arenas Abad, Concepción
Sancho, Carlos
Pardo, Gonzalo
Martín Bello, Leticia
author Osácar, María Cinta
author_facet Osácar, María Cinta
Arenas Abad, Concepción
Sancho, Carlos
Pardo, Gonzalo
Martín Bello, Leticia
author_role author
author2 Arenas Abad, Concepción
Sancho, Carlos
Pardo, Gonzalo
Martín Bello, Leticia
author2_role author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Stromatolite texture
Stable isotopes
Fluvial tufa
Pleistocene
Pleistocene
Textura de estromatolitos
Isótopos estables
Tobas fluviales
Pleistoceno
Holoceno
topic Stromatolite texture
Stable isotopes
Fluvial tufa
Pleistocene
Pleistocene
Textura de estromatolitos
Isótopos estables
Tobas fluviales
Pleistoceno
Holoceno
description The stable isotope composition (S’3C and S,80) of the laminae in three Quaternary, calcitic, tufa strom atolites of different ages (M IS6, M IS 5 a n d M IS1 ) in the Anamaza valley are studied and compared with the modern tufa in the Ahamaza river. The cyclic textural variations represent thick cyanobacteria! growth in the light laminae and thin or absent cyanobacteria! growth in the dark laminae. The textural cyclicity is parallel to 8 180 changes: Each light-dark couplet corresponds to one year in which the light lamina (lower 8 ’80 values) represents warmer water temperatures (Tw) than the dark lamina (higher 8 ’80 values). This is consistent with the fact that the large crystals composing the dark laminae correspond to precipitation in the absence of microbial films and likely represent the coldest conditions. The 8 ,s0 ^ -derived Tw from M IS 5 stromatolite is higher than the MIS6 and MIS 1 samples, which agrees with the commonly admitted climatic conditions during MIS5 in NE Iberia. Moreover, S^O^mi Tw from MIS6 suggests a wider yearly Tw range than the two other samples. The higher a n d more disperse S ,3C values o f the M IS1 stromatolite are consisten t with the peculiarities o f the vegetal co ver a n d the de cre a se d w a ter availability in the Holocene
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-01-01
2017
2017-01-01
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 http://hdl.handle.net/10272/14549
url http://hdl.handle.net/10272/14549
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
Atribución-NoComercial-SinDerivadas 3.0 España
http://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
http://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 Sociedad Geológica de España
publisher.none.fl_str_mv Sociedad Geológica de España
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422085775818752
score 15,81155

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