Open Access

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

Earth, Planets and Space200658:BF03352634

Received: 22 December 2005

Accepted: 5 June 2006

Published: 8 November 2006


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 magnetismMagnetiteTitanomagnetiteHoloceneBuenos Aires