10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps

A rock avalanche deposit was investigated in order to understand the chronological evolution of geological hazards and to evaluate the interaction of the triggering geodynamic processes in the valley Val Viola, Italian Alps. The deposit is situated west of the Alpe Dosde ́, in a permafrost area with...

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Main Authors: HORMES A, IVY OCHS S, KUBIK P, FERRELI L, MICHETTI, ALESSANDRO MARIA
Other Authors: Hormes, A, IVY OCHS, S, Kubik, P, Ferreli, L, Michetti, ALESSANDRO MARIA
Format: Article in Journal/Newspaper
Language:English
Published: 2008
Subjects:
Online Access:http://hdl.handle.net/11383/1677056
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spelling ftuninsubriairis:oai:irinsubria.uninsubria.it:11383/1677056 2024-04-14T08:18:15+00:00 10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps HORMES A IVY OCHS S KUBIK P FERRELI L MICHETTI, ALESSANDRO MARIA Hormes, A IVY OCHS, S Kubik, P Ferreli, L Michetti, ALESSANDRO MARIA 2008 http://hdl.handle.net/11383/1677056 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000260807200012 volume:190 firstpage:136 lastpage:145 numberofpages:15 journal:QUATERNARY INTERNATIONAL http://hdl.handle.net/11383/1677056 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-53249109786 Exposure age rock avalanche Holocene Valtellina info:eu-repo/semantics/article 2008 ftuninsubriairis 2024-03-21T18:53:31Z A rock avalanche deposit was investigated in order to understand the chronological evolution of geological hazards and to evaluate the interaction of the triggering geodynamic processes in the valley Val Viola, Italian Alps. The deposit is situated west of the Alpe Dosde ́, in a permafrost area with deep-seated gravitational deformations (DSGD) along a tectonic line. Based on its geomorphologic context, the rock avalanche was first interpreted as a result of slope stress release without exact timing. This hypothesis was tested by measuring the 10Be exposure date of quartz from one boulder from the rock avalanche. The age of 74307460 years places the event in the early Holocene. The timing of the last deglaciation was constrained using the inner late glacial moraine of a moraine doublet in the valley Alpe Dosde ́ situated at an altitude between 2140 and 2120m a.s.l. west of the rock avalanche. The 10Be concentrations of quartz yield minimum exposure ages of 11,4807670 and 10,8507820 years. Different proposals for potential triggering factors of the rock avalanche include (a) melting of the local valley glacier and slope stress release in the Val Viola, likely to play a minor role as trigger, because of the time delay between the deglaciation and the rock avalanche event. More likely are (b) enhanced crustal seismicity induced by post-glacial regional isostatic glacial rebound coupled with tectonic stress or/and (c) climate conditions with higher temperatures around 74307460 years, resulting in an upwards movement of the permafrost limit and destabilization of the rock walls. Article in Journal/Newspaper permafrost IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) Alta
institution Open Polar
collection IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria)
op_collection_id ftuninsubriairis
language English
topic Exposure age
rock avalanche
Holocene
Valtellina
spellingShingle Exposure age
rock avalanche
Holocene
Valtellina
HORMES A
IVY OCHS S
KUBIK P
FERRELI L
MICHETTI, ALESSANDRO MARIA
10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps
topic_facet Exposure age
rock avalanche
Holocene
Valtellina
description A rock avalanche deposit was investigated in order to understand the chronological evolution of geological hazards and to evaluate the interaction of the triggering geodynamic processes in the valley Val Viola, Italian Alps. The deposit is situated west of the Alpe Dosde ́, in a permafrost area with deep-seated gravitational deformations (DSGD) along a tectonic line. Based on its geomorphologic context, the rock avalanche was first interpreted as a result of slope stress release without exact timing. This hypothesis was tested by measuring the 10Be exposure date of quartz from one boulder from the rock avalanche. The age of 74307460 years places the event in the early Holocene. The timing of the last deglaciation was constrained using the inner late glacial moraine of a moraine doublet in the valley Alpe Dosde ́ situated at an altitude between 2140 and 2120m a.s.l. west of the rock avalanche. The 10Be concentrations of quartz yield minimum exposure ages of 11,4807670 and 10,8507820 years. Different proposals for potential triggering factors of the rock avalanche include (a) melting of the local valley glacier and slope stress release in the Val Viola, likely to play a minor role as trigger, because of the time delay between the deglaciation and the rock avalanche event. More likely are (b) enhanced crustal seismicity induced by post-glacial regional isostatic glacial rebound coupled with tectonic stress or/and (c) climate conditions with higher temperatures around 74307460 years, resulting in an upwards movement of the permafrost limit and destabilization of the rock walls.
author2 Hormes, A
IVY OCHS, S
Kubik, P
Ferreli, L
Michetti, ALESSANDRO MARIA
format Article in Journal/Newspaper
author HORMES A
IVY OCHS S
KUBIK P
FERRELI L
MICHETTI, ALESSANDRO MARIA
author_facet HORMES A
IVY OCHS S
KUBIK P
FERRELI L
MICHETTI, ALESSANDRO MARIA
author_sort HORMES A
title 10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps
title_short 10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps
title_full 10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps
title_fullStr 10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps
title_full_unstemmed 10-Be exposure ages of a rock avalanche and a late glacial moraine in Alta Valtellina, Italian Alps
title_sort 10-be exposure ages of a rock avalanche and a late glacial moraine in alta valtellina, italian alps
publishDate 2008
url http://hdl.handle.net/11383/1677056
geographic Alta
geographic_facet Alta
genre permafrost
genre_facet permafrost
op_relation info:eu-repo/semantics/altIdentifier/wos/WOS:000260807200012
volume:190
firstpage:136
lastpage:145
numberofpages:15
journal:QUATERNARY INTERNATIONAL
http://hdl.handle.net/11383/1677056
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-53249109786
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