Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)

The analysis of a database of radiocarbon ages is proposed as a tool for investigating major glaciofluvial systems of the Last Glacial Maximum (LGM) in the Alpine foreland, and their relations with glacier dynamics and climatic fluctuations. Our research concerns the Brenta megafan (NE Italy), where...

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Published in:Quaternary Science Reviews
Main Authors: ROSSATO, SANDRO, MOZZI, PAOLO
Other Authors: Rossato, Sandro, Mozzi, Paolo
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Ltd 2016
Subjects:
Online Access:http://hdl.handle.net/11577/3212674
https://doi.org/10.1016/j.quascirev.2016.07.013
http://www.journals.elsevier.com/quaternary-science-reviews/
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author ROSSATO, SANDRO
MOZZI, PAOLO
author2 Rossato, Sandro
Mozzi, Paolo
author_facet ROSSATO, SANDRO
MOZZI, PAOLO
author_sort ROSSATO, SANDRO
collection Padua Research Archive (IRIS - Università degli Studi di Padova)
container_start_page 115
container_title Quaternary Science Reviews
container_volume 148
description The analysis of a database of radiocarbon ages is proposed as a tool for investigating major glaciofluvial systems of the Last Glacial Maximum (LGM) in the Alpine foreland, and their relations with glacier dynamics and climatic fluctuations. Our research concerns the Brenta megafan (NE Italy), where 110 radiocarbon dates integrate a robust regional stratigraphic and palaeoclimatic framework. Age-depth models allowed us to calculate sedimentation rates, while the time distribution of peat layers, which recurrently formed in this region during the LGM, were estimated through meta-analysis. The reliability of statistical results was carefully evaluated using Pearson and Spearman coefficients. Sedimentation rates in the Brenta megafan markedly fluctuated during LGM: ≈1.8 m/ka between 40 and 26.7 ka cal BP; ≈3 m/ka between 26.7 and 23.8 ka cal BP and ≈1.4 m/ka from 23.8 to 17.5 ka cal BP, when the distributary system deactivated due to fan-head trenching. This is evidence that sediment input and routing in the glaciofluvial distributary system was particularly efficient during the central part of LGM, when glaciers were stable at their outermost position. Meta-analysis indicates an increase in peat formation in correspondence with global (Heinrich Event 3 and/or the Greenland Interstadial 5.1 and 4 for the 30.5, 29.6 and 28.8 ka cal BP peaks) and regional (23.5 ka cal BP) wet events. Other peaks at 22.2, 21.8, 20.2 and 19 ka cal BP correlate with fluctuations of south-eastern Alpine glaciers. Significant peat formation continued until ≈18 ka cal BP, when the last peak occurred. A marked decrease in peat formation is recorded concomitantly with the onset of Heinrich Event 2 (i.e. the 26 ka cal BP trough). The good correspondence of sedimentary events in the Brenta glaciofluvial system with the dynamics of glaciers and glaciofluvial and lacustrine systems in the southern Eastern Alps suggests a common climatic forcing on the whole region during the LGM. Peat layer formation in the floodplain fens increased ...
format Article in Journal/Newspaper
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Greenland
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Greenland
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Last Peak
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journal:QUATERNARY SCIENCE REVIEWS
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doi:10.1016/j.quascirev.2016.07.013
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spelling ftunivpadovairis:oai:www.research.unipd.it:11577/3212674 2025-01-16T22:02:37+00:00 Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy) ROSSATO, SANDRO MOZZI, PAOLO Rossato, Sandro Mozzi, Paolo 2016 STAMPA http://hdl.handle.net/11577/3212674 https://doi.org/10.1016/j.quascirev.2016.07.013 http://www.journals.elsevier.com/quaternary-science-reviews/ eng eng Elsevier Ltd info:eu-repo/semantics/altIdentifier/wos/WOS:000383313100009 volume:148 firstpage:115 lastpage:127 numberofpages:13 journal:QUATERNARY SCIENCE REVIEWS http://hdl.handle.net/11577/3212674 doi:10.1016/j.quascirev.2016.07.013 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84979200773 http://www.journals.elsevier.com/quaternary-science-reviews/ Alluvial sedimentation European Alp LGM Paleoclimate Peat layer Radiocarbon dates database Venetian-Friulian alluvial plain Geology Global and Planetary Change Ecology Evolution Behavior and Systematic Archeology (arts and humanities) Archeology info:eu-repo/semantics/article 2016 ftunivpadovairis https://doi.org/10.1016/j.quascirev.2016.07.013 2024-01-24T17:51:55Z The analysis of a database of radiocarbon ages is proposed as a tool for investigating major glaciofluvial systems of the Last Glacial Maximum (LGM) in the Alpine foreland, and their relations with glacier dynamics and climatic fluctuations. Our research concerns the Brenta megafan (NE Italy), where 110 radiocarbon dates integrate a robust regional stratigraphic and palaeoclimatic framework. Age-depth models allowed us to calculate sedimentation rates, while the time distribution of peat layers, which recurrently formed in this region during the LGM, were estimated through meta-analysis. The reliability of statistical results was carefully evaluated using Pearson and Spearman coefficients. Sedimentation rates in the Brenta megafan markedly fluctuated during LGM: ≈1.8 m/ka between 40 and 26.7 ka cal BP; ≈3 m/ka between 26.7 and 23.8 ka cal BP and ≈1.4 m/ka from 23.8 to 17.5 ka cal BP, when the distributary system deactivated due to fan-head trenching. This is evidence that sediment input and routing in the glaciofluvial distributary system was particularly efficient during the central part of LGM, when glaciers were stable at their outermost position. Meta-analysis indicates an increase in peat formation in correspondence with global (Heinrich Event 3 and/or the Greenland Interstadial 5.1 and 4 for the 30.5, 29.6 and 28.8 ka cal BP peaks) and regional (23.5 ka cal BP) wet events. Other peaks at 22.2, 21.8, 20.2 and 19 ka cal BP correlate with fluctuations of south-eastern Alpine glaciers. Significant peat formation continued until ≈18 ka cal BP, when the last peak occurred. A marked decrease in peat formation is recorded concomitantly with the onset of Heinrich Event 2 (i.e. the 26 ka cal BP trough). The good correspondence of sedimentary events in the Brenta glaciofluvial system with the dynamics of glaciers and glaciofluvial and lacustrine systems in the southern Eastern Alps suggests a common climatic forcing on the whole region during the LGM. Peat layer formation in the floodplain fens increased ... Article in Journal/Newspaper glacier Greenland Padua Research Archive (IRIS - Università degli Studi di Padova) Greenland Last Peak ENVELOPE(-134.221,-134.221,61.599,61.599) Quaternary Science Reviews 148 115 127
spellingShingle Alluvial sedimentation
European Alp
LGM
Paleoclimate
Peat layer
Radiocarbon dates database
Venetian-Friulian alluvial plain
Geology
Global and Planetary Change
Ecology
Evolution
Behavior and Systematic
Archeology (arts and humanities)
Archeology
ROSSATO, SANDRO
MOZZI, PAOLO
Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)
title Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)
title_full Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)
title_fullStr Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)
title_full_unstemmed Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)
title_short Inferring LGM sedimentary and climatic changes in the southern Eastern Alps foreland through the analysis of a 14C ages database (Brenta megafan, Italy)
title_sort inferring lgm sedimentary and climatic changes in the southern eastern alps foreland through the analysis of a 14c ages database (brenta megafan, italy)
topic Alluvial sedimentation
European Alp
LGM
Paleoclimate
Peat layer
Radiocarbon dates database
Venetian-Friulian alluvial plain
Geology
Global and Planetary Change
Ecology
Evolution
Behavior and Systematic
Archeology (arts and humanities)
Archeology
topic_facet Alluvial sedimentation
European Alp
LGM
Paleoclimate
Peat layer
Radiocarbon dates database
Venetian-Friulian alluvial plain
Geology
Global and Planetary Change
Ecology
Evolution
Behavior and Systematic
Archeology (arts and humanities)
Archeology
url http://hdl.handle.net/11577/3212674
https://doi.org/10.1016/j.quascirev.2016.07.013
http://www.journals.elsevier.com/quaternary-science-reviews/