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Grain Size Analysis and Clay Mineral Associations in Bottom Sediments From Paraná River Basin

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      Abstract

      Three different clay mineral assemblages are detected in mud-sandy bottom sediments of the Paraná Basin of Argentina. A dominant Kaolinite association, with sources areas in the Upper Amazon, north-east of the study area and within the Brazilian Shield (also with subordinated crystalline Illite); an Illitic- Smectitic and Interlayer I/S association, from the Andean Cordillera and the Chaco Plains in the north-west and mainly represented by the Bermejo and Pilcomayo Rivers; a southern Illitic-Chlorite dominant, but with lower crystallinity index than in the northern area, whose source is in the Pampean Plains to the west of Argentina. Mixed layer clays (Illite/Smectite) were also detected in this southern sector. These clay mineral associations reflect not only the climate but the source rock composition in these three main geographical areas. The tributaries of the lower Paraná River Basin show a dominant Illitic-Smectitic clay mineral association that has been eroded and transported from the Pampean Plains. In this contribution, three main clay mineral associations (Illite-Chlorite, Smectite-I/S, and Kaolinite) in stream sediments of the Paraná River and tributaries within a wide area of Argentina are described and their provenance is interpreted on the basis of controlling factors, climate and provenance.

      Translated abstract

      Se describen tres asociaciones de argilominerales presentes en sedimentos de fondo limo-arcillosos del río Paraná y algunos de sus tributarios en Argentina. Una asociación con Caolinita (con Illita cristalina subordinada) y con áreas de aporte hacia el noreste de la zona de estudio, en el Alto Amazonas y el Macizo Brasileño, una asociación de Illita-Esmectita e interestratificado Esmectita/ Illita, procedente de la Cordillera Andina y las Planicies del Chaco ubicadas hacia el noroeste y representadas por los ríos Bermejo y Pilcomayo y una asociación de Illita-Clorita dominante, de menor índice de cristalinidad que las del área norte, procedente de las Planicies Pampeanas de Argentina hacia el oeste. Argilominerales interestratificados de tipo Illita/ Esmectita son también descriptos en este sector sur. Las asociaciones de arcilla reflejan tanto la influencia del clima como a la litología y composición de estas áreas de aporte. Los tributarios del río Paraná Inferior muestran una composición de argilominerales dominante, de tipo Illita-Esmectita con proveniencia de las Planicies Pampeanas. En esta contribución tres asociaciones de argilofacies (Illita-Clorita, Illita- Esmectita interestratificado y Caolinita) en los sedimentos de fondo de los tributarios del Río Paraná son analizadas e interpretadas en base a los principales factores de control como clima y procedencia.

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      Most cited references 43

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      Mineralogy and Sedimentation of Recent Deep-Sea Clay in the Atlantic Ocean and Adjacent Seas and Oceans

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        Antarctic subtropical humid episode at the Paleocene-Eocene boundary: Clay-mineral evidence

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          Geochemistry of large river suspended sediments: silicate weathering or recycling tracer?

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            Author and article information

            Affiliations
            [1 ] UNLP- CONICET Argentina
            [2 ] UNLP- CONICET Argentina
            [3 ] UNLP- CONICET Argentina
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            lajsba
            Latin American journal of sedimentology and basin analysis
            Lat. Am. j. sedimentol. basin anal.
            Asociación Argentina de Sedimentología (La Plata )
            1851-4979
            December 2008
            : 15
            : 2
            : 125-137
            S1851-49792008000200004

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Argentina
            Categories
            GEOLOGY
            GEOSCIENCES, MULTIDISCIPLINARY

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