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| Format: | Artículo científico |
| Language: | en |
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Universidad Autónoma de Baja California
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=48003118 |
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Table of Contents:
- Geochemical characterization of sediment cores from the continental shelf off the western rias area (NW Iberian Peninsula) Catarina Corredeira M. Fátima Araújo Ângela Gouveia J.M. Jouanneau Ciencias de la Tierra heavy metals NW Iberian shelf energy dispersive X sedimentary geochemistry ray fluorescence spectrometry 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 determinationsand elemental analyses. Chemical analyses were carried out by multielemental techniques: energy dispersive X-rayfluorescence spectrometry (EDXRF) and instrumental neutron activation analysis (INAA). The grain-size distributiondemonstrated that samples collected off the rias (Vigo and Pontevedra) contain higher percentages of silt and clay. The carbonateenrichment measured in some sediment samples with different locations and granulometries seems to indicate that the sedimentsmight have distinct origins: biological fluvial productivity in sediments off the rias and marine biogenic activities for the deepercontinental 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 continentalcontamination 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. TheZr distribution determined in sediments collected along a straight line off Vigo Ria increases westwards, indicating an absence ofrecent exportation of this element from the continent. 2005 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48003118 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.1B Vol.31