Estudio de las propiedades magnéticas en las terrazas del río Tajoimplicaciones paleoambientales

  1. M.F. Bógalo 1
  2. P. Keller 1
  3. A. Pérez-González 2
  4. J. Gallardo 3
  5. M.L. Osete 1
  1. 1 Dpto.de Geofísica, Facultad de Física, Universidad Complutense
  2. 2 Dpto.de Geodinámica. Facultad de Geología, Universidad Complutense
  3. 3 dpto.de Edafología. E.TI. Agrónomos. Universidad Politécnica. Madrid
Revista:
Geogaceta

ISSN: 0213-683X

Año de publicación: 1996

Número: 20

Páginas: 1062-1065

Tipo: Artículo

Otras publicaciones en: Geogaceta

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.