Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)

The present work aims to understand the origin of sediments deposited in the Galician coastal zone and continental shelf. Selected sediment cores were studied using different geochemical approaches: grain-size measurements, carbonate determinations and elemental analyses. Chemical analyses were carr...

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Autores principales:	Corredeira, C, Araújo, MF, Gouveia, A, Jouanneau, JM
Formato:	info:eu-repo/semantics/article
Lenguaje:	eng
Publicado:	Iniversidad Autónoma de Baja California 2005
Materias:	sedimentary geochemistry NW Iberian shelf energy dispersive X-ray fluorescence spectrometry instrumental instrumental neutron activation analysis heavy metals geoquímica sedimentaria plataforma ibérica noroccidental espectrometría de fluorescencia de rayos X por energía dispersiva análisis por activación neutrónica instrumental metales pesados
Acceso en línea:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/84
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id	repositorioinstitucional-20.500.12930-7327
record_format	dspace
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	sedimentary geochemistry NW Iberian shelf energy dispersive X-ray fluorescence spectrometry instrumental instrumental neutron activation analysis heavy metals geoquímica sedimentaria plataforma ibérica noroccidental espectrometría de fluorescencia de rayos X por energía dispersiva análisis por activación neutrónica instrumental metales pesados
spellingShingle	sedimentary geochemistry NW Iberian shelf energy dispersive X-ray fluorescence spectrometry instrumental instrumental neutron activation analysis heavy metals geoquímica sedimentaria plataforma ibérica noroccidental espectrometría de fluorescencia de rayos X por energía dispersiva análisis por activación neutrónica instrumental metales pesados Corredeira, C Araújo, MF Gouveia, A Jouanneau, JM Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)
description	The present work aims to understand the origin of sediments deposited in the Galician coastal zone and continental shelf. Selected sediment cores were studied using different geochemical approaches: grain-size measurements, carbonate determinations and elemental analyses. Chemical analyses were carried out by multielemental techniques: energy dispersive X-ray fluorescence spectrometry (EDXRF) and instrumental neutron activation analysis (INAA). The grain-size distribution demonstrated that samples collected off the rias (Vigo and Pontevedra) contain higher percentages of silt and clay. The carbonate enrichment measured in some sediment samples with different locations and granulometries seems to indicate that the sediments might have distinct origins: biological fluvial productivity in sediments off the rias and marine biogenic activities for the deeper continental shelf sediments. Chemical analyses made it possible to distinguish different elemental sources: lithogenic, anthropogenic and biogenic. The downcore profiles of the elemental composition showed signs of a recent continental contamination for Zn and to a lesser extent for As, although there are no signs of exportation to the adjacent continental shelf. Other elements that can indicate anthropogenic activities were present in low concentrations compared with reference values. The Zr distribution determined in sediments collected along a straight line off Vigo Ria increases westwards, indicating an absence of recent exportation of this element from the continent.
format	info:eu-repo/semantics/article
author	Corredeira, C Araújo, MF Gouveia, A Jouanneau, JM
author_facet	Corredeira, C Araújo, MF Gouveia, A Jouanneau, JM
author_sort	Corredeira, C
title	Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)
title_short	Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)
title_full	Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)
title_fullStr	Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)
title_full_unstemmed	Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)
title_sort	geochemical characterization of sediment cores from the continental shelf off the western rias area (nw iberian peninsula)
publisher	Iniversidad Autónoma de Baja California
publishDate	2005
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/84
_version_	1792609722514276352
spelling	repositorioinstitucional-20.500.12930-73272023-05-09T14:30:49Z Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula) Caracterización geoquímica de núcleos de sedimento de la plataforma continental en el área de las rías occidentales (NW Península Ibérica) Corredeira, C Araújo, MF Gouveia, A Jouanneau, JM sedimentary geochemistry NW Iberian shelf energy dispersive X-ray fluorescence spectrometry instrumental instrumental neutron activation analysis heavy metals geoquímica sedimentaria plataforma ibérica noroccidental espectrometría de fluorescencia de rayos X por energía dispersiva análisis por activación neutrónica instrumental metales pesados The present work aims to understand the origin of sediments deposited in the Galician coastal zone and continental shelf. Selected sediment cores were studied using different geochemical approaches: grain-size measurements, carbonate determinations and elemental analyses. Chemical analyses were carried out by multielemental techniques: energy dispersive X-ray fluorescence spectrometry (EDXRF) and instrumental neutron activation analysis (INAA). The grain-size distribution demonstrated that samples collected off the rias (Vigo and Pontevedra) contain higher percentages of silt and clay. The carbonate enrichment measured in some sediment samples with different locations and granulometries seems to indicate that the sediments might have distinct origins: biological fluvial productivity in sediments off the rias and marine biogenic activities for the deeper continental shelf sediments. Chemical analyses made it possible to distinguish different elemental sources: lithogenic, anthropogenic and biogenic. The downcore profiles of the elemental composition showed signs of a recent continental contamination for Zn and to a lesser extent for As, although there are no signs of exportation to the adjacent continental shelf. Other elements that can indicate anthropogenic activities were present in low concentrations compared with reference values. The Zr distribution determined in sediments collected along a straight line off Vigo Ria increases westwards, indicating an absence of recent exportation of this element from the continent. En el presente trabajo se busca entender el origen de los sedimentos depositados en la zona costera y la plataforma continental de Galicia. Se estudiaron núcleos de sedimentos usando diferentes métodos geoquímicos: medición del tamaño de grano, determinación de carbonato y análisis de elementos. Se realizaron análisis químicos mediante técnicas multielementales: espectrometría de fluorescencia de rayos X por energía dispersiva (EDXRF) y análisis por activación neutrónica instrumental (INAA). La distribución del tamaño de grano mostró que los sedimentos recolectados frente a las rías de Vigo y Pontevedra contenían procentajes mayores de limo y arcilla. El enriquecimiento de carbonato medido en algunas muestras de sedimento de diferentes sitios y su granulometría parecen indicar distintos orígenes de los sedimentos: productividad biológica fluvial para los sedimentos frente a las rías y actividad biogénica marina para los sedimentos de la plataforma continental. Los perfiles de la composición de elementos del núcleo indicaron contaminación continental reciente de Zn y, en menor grado, de As, aunque sin evidencias de exportación a la plataforma continental adyacente. Otros elementos que pueden indicar actividades antropogénicas se encontraron en concentraciones bajas en comparación con valores de referencia. La distribución de Zr en los sedimentos recolectados a lo largo de una línea recta enfrente de la Ría de Vigo aumenta hacia el oeste, lo que indica que este elemento no ha sido exportado recientemente desde el continente. 2005-03-06 2021-06-03T03:54:55Z 2021-06-03T03:54:55Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/84 10.7773/cm.v31i12.84 https://hdl.handle.net/20.500.12930/7327 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/84/64 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 31 No. 1B (2005); 319-325 Ciencias Marinas; Vol. 31 Núm. 1B (2005); 319-325 2395-9053 0185-3880

Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula)

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