Correlation of magnetic and lithologic features of soils and Quaternary sediments from the Undulating Pampa,Argentina |
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| Institution: | 1. CONICET-MACN, Av. A. Gallardo 470, 1405, Buenos Aires, Argentina;2. Institute of Soils, INTA-CIRN, Villa Udaondo, 1712, Castelar, Argentina;3. Geophysic Institute, University of Munich, D-80333, München, Germany;4. Institute of Soils, University of Bayreuth, D-95445, Bayreuth, Germany;1. Centro de Investigación en Ecosistemas de la Patagonia, Km 4,5 camino Puerto Aysén, Coyhaique, Chile;2. Centro de Estudios del Hombre Austral, Instituto de la Patagonia, Universidad de Magallanes, Bulnes, 01890, Punta Arenas, Chile;3. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires, Consejo de Investigaciones Científicas y Tecnológicas, Intendente Güiraldes 2160, Ciudad Universitaria, Buenos Aires, CP 1428, Argentina;4. Departamento de Antropología, Facultad de Ciencias Sociales, Universidad de Chile, Av. Ignacio Carrera Pinto 1045, Ñuñoa, Santiago, Chile;5. Museo de Historia Natural y Cultural del Desierto de Atacama, Av. O´Higgins s/n, Parque El Loa, Calama, Chile;1. Department of Geosciences and Natural Resource Management, University of Copenhagen, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, Roskilde, Denmark;1. Centro de Investigaciones en Ciencias de la Tierra (CICTERRA, CONICET-Universidad Nacional de Córdoba), Av. Vélez Sarsfield 1611, Ciudad Universitaria, Of.1, 2° Floor, X5016GCA Córdoba, Argentina;2. Centro de Investigación y Transferencia de Jujuy (CIT, Jujuy-CONICET), Instituto de Geología y Minería, Universidad Nacional de Jujuy, Av. Bolivia 1661, San Salvador de Jujuy, Argentina;3. Centre de Recherche et d’Enseignement de Géosciences de l’Environnement-CEREGE, Université Aix-Marseille, CNRS, IRD, Europôle méditerranéen de l’Arbois, BP 80, 13545 Aix-en-Provence cedex 4, France;4. Laboratório de Radiometria Ambiental – Gerência de Metrologia das Radiações, Instituto de Pesquisas Energéticas e Nucleares – IPEN, Av. Prof. Lineu Prestes, 2242, São Paulo 05508000, Brazil;1. Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile;2. Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile;3. LISA, UMR CNRS/INSU 7583, Universités de Paris-Est Créteil et Paris-Diderot, 61 avenue du General de Gaulle, Créteil, France;4. Centre for Advanced Studies in Arid Zones, Colina El Pino s/n, La Serena, Chile;5. IRD-Sorbonne Universités (UPMC, Univ. Paris 06) – CNRS-MNHN, LOCEAN Laboratory, IRD France-Nord, 32, avenue Henri Varagnat, F-93143 Bondy, France;1. Academician Koptyug Ave., 3, 630090, Novosibirsk, Russia;2. A. Donish Institute of History, Archaeology and Ethnography, National Academy of Sciences of Tajikistan, ak. Rudaki ave., 33;3. Staromonetny per., 29/4, 119017, Moscow, Russia;4. Department of Physics, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;5. Nordic Laboratory for Luminescence Dating, DTU Physics and Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde, Denmark;6. Department of Earth Sciences, Uppsala University, Uppsala, Sweden;7. Leninskiye gory, GSP-1, Moscow, Russia |
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| Abstract: | A lithological and mineral magnetic study of three soil and underlying sedimentary sections located at different topographic positions in the Undulating Pampa was performed. On the basis of grain size analyses, clay, silt and sand mineralogy, and total Ti/Zr relationship three different sedimentary units were recognised in the profiles under study suggesting that the area has been influenced by three different sources of sediments. Magnetic susceptibility (MS) appears to be related to lithology, allowing the identification of some material and lithologic discontinuities. In the studied cases the maximum values of MS appear in both the B horizons of the present zonal soils as well as in the primary or reworked loess levels. In contrast, minimum values are associated with calcrete, paleosol, and hydromorphic horizons. Although magnetic susceptibility appears to be an effective means for identifying different materials and pedological features in this area, due to the superposition of effects on the magnetic signal a thorough interpretation of MS requires that a composite analysis should be made. |
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