The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal)
The main goal of this work is to distinguish anthropic and climatic influences in sediments from the lagoon of Aveiro (Portugal). This study is based on a core (240-cm long) collected in Murtosa Channel. Optical and X-radiographic images and high-resolution elemental profiles were acquired with ITRA...
Published in: | Journal of Coastal Research |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Coastal Education and Research Foundation
2013
|
Subjects: | |
Online Access: | http://hdl.handle.net/10773/24720 https://doi.org/10.2112/SI65-013.1 |
id |
ftria:oai:ria.ua.pt:10773/24720 |
---|---|
record_format |
openpolar |
spelling |
ftria:oai:ria.ua.pt:10773/24720 2023-05-15T17:36:44+02:00 The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) Martins, Virgínia A. Dias, João A. Bernardes, Cristina Rubio, Belén Bernabeu, Ana Rey, Daniel Soares, António M. Sobrinho, Frederico Laut, Lázaro M. Frontalini, Fabrizio Terroso, Denise Miranda, Paulo Fernández-Fernández, Sandra Rodrigues, Maria Antonieta Figueira, Rubens Sousa, Sílvia Amaral, Paula Mahiques, Michel Rocha, Fernando 2013 http://hdl.handle.net/10773/24720 https://doi.org/10.2112/SI65-013.1 eng eng Coastal Education and Research Foundation http://www.bioone.org/doi/10.2112/SI65-013.1 0749-0208 http://hdl.handle.net/10773/24720 doi:10.2112/SI65-013.1 1551-5036 restrictedAccess Sediment sources Sedimentary dynamic Geochemical and mineralogical proxies North Atlantic Oscillation Heavy metals pollution article 2013 ftria https://doi.org/10.2112/SI65-013.1 2022-05-25T18:37:04Z The main goal of this work is to distinguish anthropic and climatic influences in sediments from the lagoon of Aveiro (Portugal). This study is based on a core (240-cm long) collected in Murtosa Channel. Optical and X-radiographic images and high-resolution elemental profiles were acquired with ITRAX micro-X-ray fluorescence (XRF) core scanner. Samples collected at each ≈3 cm along the core were analysed for grain size and total organic carbon. Furthermore, the fine fraction of selected layers was subjected to geochemical analysis by ICP-MS, after total acid digestion of the sediments, and mineralogical analysis, by XRD techniques. A radiocarbon age was determined by AMS, using molluscs shells collected at a depth of 90 cm. Sediments along the core are composed by fine and medium sand, with several mud layers. Sediments composing the first 100-cm may have been deposited after 1950, as it is indicated by the radiocarbon data, the increasing trend of Zn/Al, Pb/Al and Cu/Al and total concentrations of Zn, Pb, Cu, V, Cr, As and Ni in this interval that therefore might be linked with industrial activities of Chemical Complex of Estarreja. The progressive increase of Si/Al, Cl/Al, Rb/Al, K/Al and Br/Al and reduced Al concentrations, from the base to the top of this core, are interpreted as being related to higher marine influence and greater differences in tidal currents with longer exposition to air of the sediments with the consequent formation of brines favouring minerals precipitation in the area (e.g. anhydrite). These results seem to be a consequence of several works developed over time like: i) dredging to improve the navigation access to the harbour, located in the external sector of the lagoon; ii) the control of the course of some rivers influencing the supply of sediments. The tendency of sea level rise may have also emphasized the gradual increase of marine influence in this area. Fine-grained sections, related to an increase in Al, phyllosilicates, organic matter, pyrite and siderite contents would be ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Repositório Institucional da Universidade de Aveiro (RIA) Journal of Coastal Research 65 70 75 |
institution |
Open Polar |
collection |
Repositório Institucional da Universidade de Aveiro (RIA) |
op_collection_id |
ftria |
language |
English |
topic |
Sediment sources Sedimentary dynamic Geochemical and mineralogical proxies North Atlantic Oscillation Heavy metals pollution |
spellingShingle |
Sediment sources Sedimentary dynamic Geochemical and mineralogical proxies North Atlantic Oscillation Heavy metals pollution Martins, Virgínia A. Dias, João A. Bernardes, Cristina Rubio, Belén Bernabeu, Ana Rey, Daniel Soares, António M. Sobrinho, Frederico Laut, Lázaro M. Frontalini, Fabrizio Terroso, Denise Miranda, Paulo Fernández-Fernández, Sandra Rodrigues, Maria Antonieta Figueira, Rubens Sousa, Sílvia Amaral, Paula Mahiques, Michel Rocha, Fernando The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) |
topic_facet |
Sediment sources Sedimentary dynamic Geochemical and mineralogical proxies North Atlantic Oscillation Heavy metals pollution |
description |
The main goal of this work is to distinguish anthropic and climatic influences in sediments from the lagoon of Aveiro (Portugal). This study is based on a core (240-cm long) collected in Murtosa Channel. Optical and X-radiographic images and high-resolution elemental profiles were acquired with ITRAX micro-X-ray fluorescence (XRF) core scanner. Samples collected at each ≈3 cm along the core were analysed for grain size and total organic carbon. Furthermore, the fine fraction of selected layers was subjected to geochemical analysis by ICP-MS, after total acid digestion of the sediments, and mineralogical analysis, by XRD techniques. A radiocarbon age was determined by AMS, using molluscs shells collected at a depth of 90 cm. Sediments along the core are composed by fine and medium sand, with several mud layers. Sediments composing the first 100-cm may have been deposited after 1950, as it is indicated by the radiocarbon data, the increasing trend of Zn/Al, Pb/Al and Cu/Al and total concentrations of Zn, Pb, Cu, V, Cr, As and Ni in this interval that therefore might be linked with industrial activities of Chemical Complex of Estarreja. The progressive increase of Si/Al, Cl/Al, Rb/Al, K/Al and Br/Al and reduced Al concentrations, from the base to the top of this core, are interpreted as being related to higher marine influence and greater differences in tidal currents with longer exposition to air of the sediments with the consequent formation of brines favouring minerals precipitation in the area (e.g. anhydrite). These results seem to be a consequence of several works developed over time like: i) dredging to improve the navigation access to the harbour, located in the external sector of the lagoon; ii) the control of the course of some rivers influencing the supply of sediments. The tendency of sea level rise may have also emphasized the gradual increase of marine influence in this area. Fine-grained sections, related to an increase in Al, phyllosilicates, organic matter, pyrite and siderite contents would be ... |
format |
Article in Journal/Newspaper |
author |
Martins, Virgínia A. Dias, João A. Bernardes, Cristina Rubio, Belén Bernabeu, Ana Rey, Daniel Soares, António M. Sobrinho, Frederico Laut, Lázaro M. Frontalini, Fabrizio Terroso, Denise Miranda, Paulo Fernández-Fernández, Sandra Rodrigues, Maria Antonieta Figueira, Rubens Sousa, Sílvia Amaral, Paula Mahiques, Michel Rocha, Fernando |
author_facet |
Martins, Virgínia A. Dias, João A. Bernardes, Cristina Rubio, Belén Bernabeu, Ana Rey, Daniel Soares, António M. Sobrinho, Frederico Laut, Lázaro M. Frontalini, Fabrizio Terroso, Denise Miranda, Paulo Fernández-Fernández, Sandra Rodrigues, Maria Antonieta Figueira, Rubens Sousa, Sílvia Amaral, Paula Mahiques, Michel Rocha, Fernando |
author_sort |
Martins, Virgínia A. |
title |
The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) |
title_short |
The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) |
title_full |
The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) |
title_fullStr |
The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) |
title_full_unstemmed |
The ITRAX core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of Aveiro (N Portugal) |
title_sort |
itrax core scanner, a useful tool to distinguish anthropic vs. climatic influences in lagoon of aveiro (n portugal) |
publisher |
Coastal Education and Research Foundation |
publishDate |
2013 |
url |
http://hdl.handle.net/10773/24720 https://doi.org/10.2112/SI65-013.1 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
http://www.bioone.org/doi/10.2112/SI65-013.1 0749-0208 http://hdl.handle.net/10773/24720 doi:10.2112/SI65-013.1 1551-5036 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.2112/SI65-013.1 |
container_title |
Journal of Coastal Research |
container_volume |
65 |
container_start_page |
70 |
op_container_end_page |
75 |
_version_ |
1766136306294849536 |