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      Variaciones isotópicas (210Pb, 137Cs) antropogénicas en el registro estratigráfico de un lago de la cordillera de Nahuelbuta, Chile

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          Abstract

          La actividad y distribución de 210Pb y 137Cs en el registro sedimentario de un lago de la cordillera de Nahuelbuta están influenciadas por la actividad antrópica. Análisis isotópicos, de rayos X, susceptibilidad magnética, polen y granulometría muestran que tanto las variaciones en las tasas de erosión, generadas por cambios en el uso del suelo de la cuenca, como las inyecciones atmosféricas del 137Cs han operado sobre el comportamiento de dichos isótopos en la columna estratigráfica. Se discute, también, el papel desempeñado por algunas variables naturales, como la proporción entre continentes y océanos en el hemisferio sur y la localización de la cordillera de Nahuelbuta.

          Translated abstract

          Anthropogenic isotope (210Pb, 137Cs) variations in the sedimentary record from a lake in the Nahuelbuta mountain range, Chile. The activity and distribution of 210Pb and 137Cs through the sedimentary record of a lake, which is located in the Nahuelbuta mountain range, are influenced by anthropic activity. Isotope analyses, X-rays, magnetic susceptibility, pollen and grain size analyses show both erosion rates variations-produced by land use changes within the watershed-and the 137Cs atmospheric inputs have affected on the behavior of those isotopes in the record. The role of some natural variables -as the low ratio of land to ocean in southern latitudes, and the Nahuelbuta mountain range locations are also discussed

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          Most cited references 59

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            A new procedure for the determination of lead-210 in lake and marine sediments

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                Author and article information

                Journal
                rgch
                Revista geológica de Chile
                Rev. geol. Chile
                Servicio Nacional de Geología y Minería (SERNAGEOMIN) (Santiago, , Chile )
                0716-0208
                July 2001
                : 28
                : 1
                : 105-115
                Affiliations
                Concepción orgnameUniversidad de Concepción orgdiv1Centro EULA-Chile Chile mcisterv@ 123456udec.cl
                Article
                S0716-02082001000100006 S0716-0208(01)02800106
                10.4067/S0716-02082001000100006

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 44, Pages: 11
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