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Abstract:

Pedosedimentary processes, recorded in a late Quaternary section near Zarate city, north Buenos Aires province are reconstructed in this study. Both field features and laboratory results were analyzed as a whole. Grain size, sand, silt and clay mineralogy, micromorphology, Rb and Sr concentrations, optical stimulated luminescence (OSL) ages as well as preliminary paleomagnetic analysis were performed in order to get a detailed information on processes involved. All studied paleosols were developed on loess horizons. Four definite breaks in sedimentation and a coupled development of paleosols were observed. On this basis four units showing different types of calcretes were defined. Welded paleosols at unit C, could be correlated to those studied at Baradero (Buenos Aires province) and Lozada (Córdoba province), which probably record the last interglacial stage before present, the Marine Isotopic Stage 5 (MIS5), studied on marine cores. The highest values of Rb/Sr ratio reflect changes due to chemical weathering processes and generally match paleosol levels occurrences. Development of ground water-related and pedogenic calcretes, as well as their association to smectite, illite and ferric oxide indicate drier weather conditions than present and strong seasonality. Finally, a tentative correlation between one of the paleosols and the marine isotope stage 11(MIS 11) is suggested.

Registro:

Documento: Artículo
Título:A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals
Autor:Tófalo, O.R.; Orgeira, M.J.; Ramos, A.M.; Alonso, M.S.
Filiación:Departamento Cs. Geológicas, FCEN, Universidad de Buenos Aires, Pabellón II, 1428 Buenos Aires, Argentina
CONICET
Instituto de Geocronología y Geología Isotópica, 1428 Buenos Aires, Argentina
Palabras clave:Loess-paleosols successions; Micromorphology; Mineralogy; Pampa Ondulada; Zárate; calcrete; Cenozoic; chemical weathering; grain size; interglacial; loess; marine isotope stage; micromorphology; paleosol; sediment analysis; sedimentation; Argentina; Buenos Aires [Argentina]; South America
Año:2008
Volumen:63
Número:3
Página de inicio:430
Página de fin:441
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00044822_v63_n3_p430_Tofalo.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n3_p430_Tofalo

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Citas:

---------- APA ----------
Tófalo, O.R., Orgeira, M.J., Ramos, A.M. & Alonso, M.S. (2008) . A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals . Revista de la Asociacion Geologica Argentina, 63(3), 430-441.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n3_p430_Tofalo [ ]
---------- CHICAGO ----------
Tófalo, O.R., Orgeira, M.J., Ramos, A.M., Alonso, M.S. "A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals " . Revista de la Asociacion Geologica Argentina 63, no. 3 (2008) : 430-441.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n3_p430_Tofalo [ ]
---------- MLA ----------
Tófalo, O.R., Orgeira, M.J., Ramos, A.M., Alonso, M.S. "A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals " . Revista de la Asociacion Geologica Argentina, vol. 63, no. 3, 2008, pp. 430-441.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n3_p430_Tofalo [ ]
---------- VANCOUVER ----------
Tófalo, O.R., Orgeira, M.J., Ramos, A.M., Alonso, M.S. A pedosedimentary succession of the Late Cenozoic of Zárate (Buenos Aires): Continental record of the MIS5 and older interglacial intervals . Rev. Asoc. Geol. Argent. 2008;63(3):430-441.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n3_p430_Tofalo [ ]