Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island

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...

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Autor principal: Manograsso Czalbowski, Nadia Tamara
Publicado: 2017
Materias:
Antarctica
environmental magnetism
grain size analysis
hydrochemical studies
lake sediments
multivariate statistics
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v_n_p1_Chaparro
http://hdl.handle.net/20.500.12110/paper_09541020_v_n_p1_Chaparro
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_09541020_v_n_p1_Chaparro2023-06-08T15:55:48Z Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island Manograsso Czalbowski, Nadia Tamara Antarctica environmental magnetism grain size analysis hydrochemical studies lake sediments multivariate statistics 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 m3 kg-1, remanent coercivity Hcr=49.2 mT and total organic carbon (TOC)=1.11%) and sand facies (e.g. χ=82.1×10-8 m3 kg-1, Hcr=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. © Antarctic Science Ltd 2017 Fil:Manograsso Czalbowski, N.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v_n_p1_Chaparro http://hdl.handle.net/20.500.12110/paper_09541020_v_n_p1_Chaparro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Antarctica
environmental magnetism
grain size analysis
hydrochemical studies
lake sediments
multivariate statistics
spellingShingle Antarctica
environmental magnetism
grain size analysis
hydrochemical studies
lake sediments
multivariate statistics
Manograsso Czalbowski, Nadia Tamara
Sedimentary analysis and magnetic properties of Lake Anónima, Vega Island
topic_facet Antarctica
environmental magnetism
grain size analysis
hydrochemical studies
lake sediments
multivariate statistics
description 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 m3 kg-1, remanent coercivity Hcr=49.2 mT and total organic carbon (TOC)=1.11%) and sand facies (e.g. χ=82.1×10-8 m3 kg-1, Hcr=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. © Antarctic Science Ltd 2017
author Manograsso Czalbowski, Nadia Tamara
author_facet Manograsso Czalbowski, Nadia Tamara
author_sort Manograsso Czalbowski, Nadia Tamara
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
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v_n_p1_Chaparro
http://hdl.handle.net/20.500.12110/paper_09541020_v_n_p1_Chaparro
work_keys_str_mv AT manograssoczalbowskinadiatamara sedimentaryanalysisandmagneticpropertiesoflakeanonimavegaisland
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