MAGNETIC PROPERTIES IN A LOESS-PALEOSOL SEQUENCE OF CÓRDOBA, ARGENTINA

ROUZAUT; ORGEIRA; VASQUEZ; ARGÜELLO; SANABRIA

revista de la sociedad geologica de españa

Sociedad Geologica de España

Lugar: Salamanca; Año: 2012 vol. 25 p. 57 - 65

0214-2708

Abstract: In order to understand pedogenic processes and their relation with changes in magnetic mineralogy and paleoclimate conditions, a study of magnetic properties was carried out in Corralito area, Córdoba province, Argentina. In this contribution the hysteresis parameters at room temperature and the variation of magnetic susceptibility with temperature were analyzed. The area is situated in central semiarid region of Argentina (mean annual precipitation of 700 mm and mean annual temperature of 17ºC). The section comprises loess layers with one buried soil and three paleosols. An extensive period of soil formation recorded in one of the mentioned paleosol can be correlated with Marine Isotopic Stage 5 (MIS 5) and other two paleosols could be related with Marine Isotopic Stage 3 (MIS 3).Changes in magnetic parameters suggest that paleosol III and the buried soil are characterized by depletion of detrital magnetic minerals, while the other paleosols the magnetic signal is the opposite.According to the interpretation of the obtained results the actual climatic conditions seems to be similar to those prevailing during MIS 5, while MIS 3 seems to be more humid. Keywords: Magnetic Properties, Paleosols, Quaternary.