Purpose: Loess in Northern Italy has been usually considered deposited during the MIS 4-2 period, which corresponds to the last Pleistocene glacial cycle. In particular, no absolute dating evidenced loess depositions older than ca. 89 ka. We investigated two strongly rubified soil profiles in the southern margin of the Alpine range in Lombardy to prove their aeolian origin and age of formation. Methods: We analysed the granulometry of all genetic horizons of these strongly rubified soils, and a total of 8 samples were collected for luminescence dating purpose. Results: Most of the analysed soil horizons were dominated by silt and were characterized by the s-shaped granulometric curve, typical of loess materials. A particularly high clay content evidenced a strong weathering degree. A deep horizon was particularly clay rich, and it was interpreted as a typical Terra-Rossa horizon. Luminescence dates increased with depth, reaching 122 ka for the deepest loess layer and 453 ka (minimum age) for the Terra-Rossa horizon. Conclusions: The deepest observed loess layer represents the oldest quantitatively dated aeolian deposition in Northern Italy up to now.

New dates of a Northern Italian loess deposit (Monte Orfano, Southern pre-Alps, Brescia) / M. D'Amico, E. Casati, S. Andreucci, M. Martini, L. Panzeri, D. Sechi, D. Abu El Khair, F. Previtali. - In: JOURNAL OF SOILS AND SEDIMENTS. - ISSN 1439-0108. - 21:2(2021 Jan 07), pp. 832-841. [10.1007/s11368-020-02860-4]

New dates of a Northern Italian loess deposit (Monte Orfano, Southern pre-Alps, Brescia)

M. D'Amico
;
F. Previtali
2021

Abstract

Purpose: Loess in Northern Italy has been usually considered deposited during the MIS 4-2 period, which corresponds to the last Pleistocene glacial cycle. In particular, no absolute dating evidenced loess depositions older than ca. 89 ka. We investigated two strongly rubified soil profiles in the southern margin of the Alpine range in Lombardy to prove their aeolian origin and age of formation. Methods: We analysed the granulometry of all genetic horizons of these strongly rubified soils, and a total of 8 samples were collected for luminescence dating purpose. Results: Most of the analysed soil horizons were dominated by silt and were characterized by the s-shaped granulometric curve, typical of loess materials. A particularly high clay content evidenced a strong weathering degree. A deep horizon was particularly clay rich, and it was interpreted as a typical Terra-Rossa horizon. Luminescence dates increased with depth, reaching 122 ka for the deepest loess layer and 453 ka (minimum age) for the Terra-Rossa horizon. Conclusions: The deepest observed loess layer represents the oldest quantitatively dated aeolian deposition in Northern Italy up to now.
Loess; MIS1-MIS6; OSL-IRSL dating; Terra-Rossa soil
Settore AGR/14 - Pedologia
Settore GEO/04 - Geografia Fisica e Geomorfologia
Article (author)
File in questo prodotto:
File Dimensione Formato  
accepted manuscript.pdf

embargo fino al 07/01/2022

Descrizione: Accepted manuscript
Tipologia: Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione 251.04 kB
Formato Adobe PDF
251.04 kB Adobe PDF Visualizza/Apri
2021 DAmico2021_Article_NewDatesOfANorthernItalianLoes.pdf

accesso riservato

Tipologia: Publisher's version/PDF
Dimensione 2.73 MB
Formato Adobe PDF
2.73 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/874617
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact