SciELO - Scientific Electronic Library Online

vol.60 número2El género Histosyrinx Massa, Termier y Termier, 1974 (Septosyringothyridinae, Brachiopoda) en el Carbonífero Tardío de ArgentinaVetas de cuarzo en el sur de Santiago del Estero índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados



  • No hay articulos citadosCitado por SciELO

Links relacionados

  • No hay articulos similaresSimilares en SciELO


Revista de la Asociación Geológica Argentina

versión On-line ISSN 1851-8249


NABEL, P.E.; MORRAS, H.J.M.  y  SAPOZNIK, M.. Magnetostratigraphy of Cenozoic sediments in western Buenos Aires. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.2, pp. 383-388. ISSN 1851-8249.

A palaeomagnetic study of Quaternary sediments in western Buenos Aires city, was carried out in order to know their age and the time span during which the different processes of deposition and evolution took place. This study carried out on two profiles called CAS and GAO, recognized the upper 8m of the loessic plain sediments as belonging to the Brunhes Magnetic Polarity Zone (younger than 0.78 Ma), and the underlying sediments to the Matuyama Magnetic Polarity Zone. This significant extension in time supports geochemical and mineralogical studies that suggest the existence of different areas of origin of the sediments in the Pampa Ondulada, and modifies the traditional concept of their homogeneity. The change of magnetic polarity was found above a buried soil, at 13,30 m a.s.l., probably equivalent to the Hisisa Geosol, identified in other areas of the province as a regional palaeosurface and proposed as the upper boundary of the Matuyama Magnetic Polarity Zone. Taking into account the morphological features of the studied materials and the fact that this magnetic polarity boundary has been repeatedly found in the upper section of the Ensenada Formation, it is possible to correlate the sediments from the lower section of the CAS profile with this formation, whereas sediments of the upper level, as well as the ones recognized in the GAO profile, correlate with the Buenos Aires Formation.

Palabras clave : Magnetostratigraphy; Pampa sediments; Buenos Aires.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License