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Geochemistry of lake sediments from the South Shetland Islands and James Ross Archipelago, north Antarctic Peninsula

Published online by Cambridge University Press:  30 May 2024

Silvia H. Coria Open the ORCID record for Silvia H. Coria [Opens in a new window] ,
Soledad Pérez Catán Open the ORCID record for Soledad Pérez Catán [Opens in a new window] ,
Andrea I. Pasquini Open the ORCID record for Andrea I. Pasquini [Opens in a new window] ,
María Arribere Open the ORCID record for María Arribere [Opens in a new window] ,
Rosemary Vieira Open the ORCID record for Rosemary Vieira [Opens in a new window] ,
Luiz H. Rosa Open the ORCID record for Luiz H. Rosa [Opens in a new window] ,
Juan M. Lirio Open the ORCID record for Juan M. Lirio [Opens in a new window]  and
Karina L. Lecomte Open the ORCID record for Karina L. Lecomte [Opens in a new window]
Silvia H. Coria
Affiliation:
Instituto Antártico Argentino, 25 de Mayo 1143, San Martín, Prov. Buenos Aires, Argentina
Soledad Pérez Catán
Affiliation:
Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche (CAB), Comisión Nacional de Energía Atómica (CNEA), Av. Bustillo km 9.5, (8400), Bariloche, Argentina
Andrea I. Pasquini
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET/Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina
María Arribere
Affiliation:
Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche (CAB), Comisión Nacional de Energía Atómica (CNEA), Av. Bustillo km 9.5, (8400), Bariloche, Argentina
Rosemary Vieira
Affiliation:
Instituto de Geociências, Universidade Federal Fluminense, Niteroi, RJ, Brazil
Luiz H. Rosa
Affiliation:
Laboratório de Microbiologia Polar e Conexões Tropicais, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, PO Box 486, Belo Horizonte, MG 31270-901, Brazil
Juan M. Lirio
Affiliation:
Instituto Antártico Argentino, 25 de Mayo 1143, San Martín, Prov. Buenos Aires, Argentina
Karina L. Lecomte*
Affiliation:
Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET/Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield, 1611, X5016CGA Córdoba, Argentina
*
karina.lecomte@unc.edu.ar
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Abstract

The geochemistry of lake sediments provides valuable information on environmental conditions and geochemical processes in polar regions. To characterize geochemical composition and to analyse weathering and provenance, 26 lakes located in six islands of the South Shetland Islands (SSI) and James Ross Archipelago (JRA) were analysed. Regarding major composition, the studied lake sediments correspond to ferruginous mudstones and to a lesser extent to mudstones. The weathering indices indicate incipient chemical alteration (Chemical Index of Alteration = 52.6; Plagioclase Index of Alteration = 57.6). The La-Th-Sc plot shows different provenance signatures. SSI lake sediments correspond to oceanic island arcs, whereas those of JRA denote a signal of continental arcs with mixed sources. In James Ross Island lake sediments are of continental arcs (inland lakes), oceanic island arcs (coastal lakes) and a middle signature (foreland lakes). Multi-elemental analysis indicates that the sediments are enriched from regional basalts in Ba, Rb, Th, Cs and U (typical of silica-rich rocks) and depleted in Cr and Co due to mafic mineral weathering. The geochemical signals identified by principal component analysis enable us to group the sediments according to the studied islands and their geomorphological characteristics. This study underlines the importance of knowing the geochemical background levels in pristine lake sediments to evaluate potential future anthropogenic effects.

Keywords

Clearwater MesaJames Ross Islandprincipal component analysisprovenancetrace elementsweathering

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Type
Earth Sciences
Information
Antarctic Science , Volume 36 , Issue 3 , June 2024 , pp. 160 - 180
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Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Antarctic Science Ltd

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