Estudio de las propiedades magnéticas en las terrazas del río Tajo: implicaciones paleoambientales

• M.F. Bógalo ^[1] ; P. Keller ^[1] ; A. Pérez-González ^[1] ; J. Gallardo ^[2] ; M.L. Osete ^[1]
  1. [1] Universidad Complutense de Madrid

     Universidad Complutense de Madrid

     Madrid, España

     
  2. [2] dpto.de Edafología. E.TI. Agrónomos. Universidad Politécnica. Madrid
• Localización: Geogaceta, ISSN 0213-683X, Nº. 20, 5, 1996, págs. 1062-1065
• Idioma: español
• Títulos paralelos:
  • Magnetic properties studies of Tagus river terraces: palaeoenvironmental implications
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• Resumen

  • Soil profiles from 12 terraces of Plio-Pleistocene to Holocene age from the Tajo river in Central Spain were investigated on there rock magnetic properties. Systematic profiles were sampled in O. 1 m intervals from 24 fresh trenches of 2.5m depth. The soil profiles consist of an upper eluvial horizon (A, E), a intermediate illuvial horizon (B), and sometimes a lower horizon (C). Low and high frequency susceptibility (x), saturation IRM (SIRM), and anhysteretic remanent magnetization (ARM) measurements were performed out. The differences between the stable values of horizon B and the high values of the horizons A and E increase with the age of the soils. Comparison of the mean values of the B horizons for each terrace show low X values for the Holocene and the Late Pleistocene, a strong x increase during the Middle Pleistocene, and again low values for the Pliocene and Early Pleistocene. Magnetic parameters of soils show the palaeoenvironmental changes during this period of time.