Created by the Monte Peron rock avalanche: Lago di Vedana (Dolomites, Italy) and its sediment record of landscape evolution after a mass wasting event

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Authors

Bernd Zolitschka , Irene Sophie Polgar , Hermann Behling 

Abstract

The timing of the Monte Peron Landslide is revised to 2890 cal. BP based on a radiocarbon-dated sediment stratigraphy of Lago di Vedana. This age fosters the importance of hydroclimatic triggers in the light of accelerating global warming with a predicted increase of precipitation enhancing the regional predisposition to large landslides. Moreover, a layer enriched in allochthonous organic and minerogenic detritus dating to the same wet period is interpreted as response to a younger and yet unidentified mass wasting event in the catchment of Lago di Vedana.
Rock debris of the Monte Peron Landslide impounded the Cordevole River valley and created a landslide-dammed lake. Around AD 1150, eutrophication of this lacustrine ecosystem started with intensified human occupation – a process that ended 150 years later, when the river was diverted back into its original bed. Most likely, this occurred due to artificial opening of the river dam. In consequence, Lago di Vedana was isolated from an open and minerogenic to an endorheic and carbonaceous lacustrine system. After a monastery was established nearby in AD 1457, a second eutrophication process was initiated due to intensified land use linked with deforestation. Only in the 18th and 19th century, deposition of organic matter decreased coinciding with climatic (Little Ice Age) and cultural changes. Conversational measures are the likely reasons for a trend towards less eutrophic conditions since AD 1950.

DOI

https://doi.org/10.31223/X55W32

Subjects

Earth Sciences, Geochemistry, Geology, Geomorphology

Keywords

geochemistry, soil erosion, Landslide, geochemistry, soil erosion, XRF scanning, XRF scanning, cultural eutrophication, Late Holocene, cultural eutrophication

Dates

Published: 2021-07-09 13:14

Last Updated: 2021-07-09 20:14

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
none

Data Availability (Reason not available):
The multiproxy dataset of the lacustrine sediment record from Lago di Vedana will be made accessible via the PANGAEA data archiving and publication system at https://doi.pangaea.de/10.1594/PANGAEA.xxxxxx during revisions.

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