Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island
Abstract During the summer Lake Anónima experiences important changes in salinity and lake level fluctuations. Physicochemical data and field observations indicate that evaporative processes are dominant and that the water inflow is mainly provided by snow meltwater and streams. A multiproxy analysi...
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Language: | English |
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Cambridge University Press (CUP)
2017
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Online Access: | http://dx.doi.org/10.1017/s0954102017000116 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102017000116 |
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crcambridgeupr:10.1017/s0954102017000116 2024-09-15T17:44:04+00:00 Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island Chaparro, Marcos A.E. Chaparro, Mauro A.E. Córdoba, Francisco E. Lecomte, Karina L. Gargiulo, José D. Barrios, Ana M. Urán, Gimena M. Manograsso Czalbowski, Nadia T. Lavat, Araceli Böhnel, Harald N. 2017 http://dx.doi.org/10.1017/s0954102017000116 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102017000116 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 29, issue 5, page 429-444 ISSN 0954-1020 1365-2079 journal-article 2017 crcambridgeupr https://doi.org/10.1017/s0954102017000116 2024-08-07T04:04:14Z Abstract During the summer Lake Anónima experiences important changes in salinity and lake level fluctuations. Physicochemical data and field observations indicate that evaporative processes are dominant and that the water inflow is mainly provided by snow meltwater and streams. A multiproxy analysis of data from lake bottom sediments suggests that the main surface stream located south-west of the lake controls the clastic input and the spatial variation of sediment composition. Through an integrated analysis (magnetic, X-ray diffraction and Fourier transform infrared spectroscopy studies) magnetite and greigite minerals were identified in these lake sediments. Such ferrimagnetic minerals have ultra-fine grain sizes (<0.1 μm). Magnetic parameters and non-magnetic variables analysed by multivariate statistics reveal significant differences between silt facies (e.g. mass-specific susceptibility χ=109.6×10 -8 m 3 kg -1 , remanent coercivity H cr =49.2 mT and total organic carbon (TOC)=1.11%) and sand facies (e.g. χ=82.1×10 -8 m 3 kg -1 , H cr =44.7 mT and TOC=0.70%), and four recent depositional sub-environments were identified and characterized in Lake Anónima. This multiparameter analysis contributes to the understanding of present-day lacustrine dynamic and sedimentary processes. Lake Anónima may provide a useful analogue for the interpretation of other lacustrine basins in the Antarctic region. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Vega Island Cambridge University Press Antarctic Science 29 5 429 444 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract During the summer Lake Anónima experiences important changes in salinity and lake level fluctuations. Physicochemical data and field observations indicate that evaporative processes are dominant and that the water inflow is mainly provided by snow meltwater and streams. A multiproxy analysis of data from lake bottom sediments suggests that the main surface stream located south-west of the lake controls the clastic input and the spatial variation of sediment composition. Through an integrated analysis (magnetic, X-ray diffraction and Fourier transform infrared spectroscopy studies) magnetite and greigite minerals were identified in these lake sediments. Such ferrimagnetic minerals have ultra-fine grain sizes (<0.1 μm). Magnetic parameters and non-magnetic variables analysed by multivariate statistics reveal significant differences between silt facies (e.g. mass-specific susceptibility χ=109.6×10 -8 m 3 kg -1 , remanent coercivity H cr =49.2 mT and total organic carbon (TOC)=1.11%) and sand facies (e.g. χ=82.1×10 -8 m 3 kg -1 , H cr =44.7 mT and TOC=0.70%), and four recent depositional sub-environments were identified and characterized in Lake Anónima. This multiparameter analysis contributes to the understanding of present-day lacustrine dynamic and sedimentary processes. Lake Anónima may provide a useful analogue for the interpretation of other lacustrine basins in the Antarctic region. |
format |
Article in Journal/Newspaper |
author |
Chaparro, Marcos A.E. Chaparro, Mauro A.E. Córdoba, Francisco E. Lecomte, Karina L. Gargiulo, José D. Barrios, Ana M. Urán, Gimena M. Manograsso Czalbowski, Nadia T. Lavat, Araceli Böhnel, Harald N. |
spellingShingle |
Chaparro, Marcos A.E. Chaparro, Mauro A.E. Córdoba, Francisco E. Lecomte, Karina L. Gargiulo, José D. Barrios, Ana M. Urán, Gimena M. Manograsso Czalbowski, Nadia T. Lavat, Araceli Böhnel, Harald N. Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island |
author_facet |
Chaparro, Marcos A.E. Chaparro, Mauro A.E. Córdoba, Francisco E. Lecomte, Karina L. Gargiulo, José D. Barrios, Ana M. Urán, Gimena M. Manograsso Czalbowski, Nadia T. Lavat, Araceli Böhnel, Harald N. |
author_sort |
Chaparro, Marcos A.E. |
title |
Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island |
title_short |
Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island |
title_full |
Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island |
title_fullStr |
Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island |
title_full_unstemmed |
Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island |
title_sort |
sedimentary analysis and magnetic properties of lake anónima, vega island |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/s0954102017000116 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102017000116 |
genre |
Antarc* Antarctic Antarctic Science Vega Island |
genre_facet |
Antarc* Antarctic Antarctic Science Vega Island |
op_source |
Antarctic Science volume 29, issue 5, page 429-444 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102017000116 |
container_title |
Antarctic Science |
container_volume |
29 |
container_issue |
5 |
container_start_page |
429 |
op_container_end_page |
444 |
_version_ |
1810491390588616704 |