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Type: Artigo de periódico
Title: Fission-track dating of a tephra layer related to Poti-Malal and Seguro drifts in the Rio Grande basin, Mendoza, Argentina
Author: Espizua, LE
Bigazzi, G
Iunes, PJ
Hadler, JC
Osorio, AM
Abstract: Two old drift units called Poti-Malal and Seguro have been differentiated in the Rio Grande basin based on relative-age criteria, stratigraphical relationships, morphology and fission-track dating. A tephra dated at 0.226+/-0.025 Ma was deposited on the Poti-Malal drift and underlies the Seguro outwash, which is inferred to equate with marine oxygen isotope stage 6. The stratigraphical position and age suggest that the tephra post-dates the Poti-Malal glaciation and that it is older than the Seguro drift. The Poti-Malal glaciation must be at least as old as Early-Middle Pleistocene, and the Seguro glaciation is assigned to the penultimate glaciation. The tephra unit may have been deposited during marine oxygen isotope stage 7. Copyright (C) 2002 John Wiley Sons, Ltd.
Subject: Pleistocene glaciations
fission-track dating
climate changes
Mendoza Andes
Country: EUA
Editor: Wiley-blackwell
Citation: Journal Of Quaternary Science. Wiley-blackwell, v. 17, n. 8, n. 781, n. 788, 2002.
Rights: fechado
Identifier DOI: 10.1002/jqs.723
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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