IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
Magnetic properties of Holocene edaphised silty eolian sediments from Tierra del Fuego (Argentina)
Autor/es:
ORGEIRA, M. J.; VÁSQUEZ, C. A., CORONATO, A. ; PONCE, F. , MORETO, A. ; OSTERRIETH, M. , EGLI, R. AND ONORATO, R
Revista:
Revista de la Sociedad Geológica de España
Editorial:
Sociedad Geologica de España
Referencias:
Lugar: Madrid; Año: 2012 vol. 25 p. 45 - 56
ISSN:
0214-2708
Resumen:
Abstract: In this contribution we present preliminary environmental magnetism results from 80 samples collected along an eolian sedimentary sequence with 8 interbedded paleosols. 14C data indicates that the studied record represents the Holocene.The results principally include hysteresis data at room temperature, variation of magnetic susceptibility at two frequencies, and susceptibility at high and low temperatures in selected samples. The results discussed here suggest that the humidity during the formation of the studied paleosols was variable for each one. This means the alternating of wet and dry periods throughout the entire Holocene have been of different intensities. The magnetic results, together with some other properties of the geological record define a high climate variability occurring in the southern extremity of the Americas. A period of higher humidity than the present is suggested by the magnetic parameters during the period represented by the paleosols P7 (471 yrs BP), P5 (5552 yrs BP), P4 (6538 yrs BP) and P2 (age between 7163 and 11308 yrs BP).