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  • Article
  • Open Access

Rock magnetic study of fluvial Holocene soil from Buenos Aires province (Argentina)

Earth, Planets and Space200658:BF03352634

https://doi.org/10.1186/BF03352634

  • Received: 22 December 2005
  • Accepted: 5 June 2006
  • Published:

Abstract

The magnetic characteristics of soils are widely used in environmental and paleoclimatic investigations for studying the several factors involved in the soil formation process. We propose here a new analytical tool that takes into account the variations in magnetic properties correlated with grain sizes and concentrations of ferrimagnetic minerals. This analytical tool is based on a mathematical model of well-established magnetic properties in samples of known grain sizes and was used in this study to determine changes in the grain size and concentration of ferrimagnetic minerals along a terminal Pleistocene/Holocene fluvial section located in the northeast of Buenos Aires province. These variations may reflect a humid period prevailing in the area and may be associated with climate changes that occurred in the Chaco-Pampean region during the Middle Holocene.

Key words

  • Rock magnetism
  • Magnetite
  • Titanomagnetite
  • Holocene
  • Buenos Aires

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