Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy
In the Schiantala Valley of the Maritime Alps, the relationship between a till-like body and a contiguous rock glacier has been analyzed using geomorphologic, geoelectric and ice-petrographic methodologies. DC resistivity tomographies undertaken in the till and in the rock glacier show the presence...
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ftuninsubriairis:oai:irinsubria.uninsubria.it:11383/1674312 2024-04-14T08:12:53+00:00 Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy RIBOLINI A CHELLI A PAPPALARDO M. GUGLIELMIN, MAURO Ribolini, A Chelli, A Guglielmin, Mauro Pappalardo, M. 2007 http://hdl.handle.net/11383/1674312 https://doi.org/10.1016/j.yqres.2007.08.004 unknown info:eu-repo/semantics/altIdentifier/wos/WOS:000250629300006 volume:68 firstpage:353 lastpage:363 numberofpages:11 journal:QUATERNARY RESEARCH http://hdl.handle.net/11383/1674312 doi:10.1016/j.yqres.2007.08.004 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-35348835942 info:eu-repo/semantics/closedAccess rock glacier debris-covered glacier glacier permafrost DC resistivity ice petrography holocene maritime Alps info:eu-repo/semantics/article 2007 ftuninsubriairis https://doi.org/10.1016/j.yqres.2007.08.004 2024-03-21T18:53:31Z In the Schiantala Valley of the Maritime Alps, the relationship between a till-like body and a contiguous rock glacier has been analyzed using geomorphologic, geoelectric and ice-petrographic methodologies. DC resistivity tomographies undertaken in the till and in the rock glacier show the presence of buried massive ice and ice-rich sediments, respectively. Ice samples from a massive ice outcrop show spherical gas inclusions and equidimensional ice crystals that are randomly orientated, confirming the typical petrographic characteristics of sedimentary ice. The rock glacier formation began after a phase of glacier expansion about 2550+/-50 C-14 yr BP. Further ice advance during the Little Ice Age (LIA) overrode the rock glacier root and caused partial shrinkage of the pre-existing permafrost. Finally, during the 19th and 20th centuries, the glacial surface became totally debris covered. Geomorphological and geophysical methods combined with analyses of ice structure and fabric can effectively interpret the genesis of landforms in an environment where glaciers and permafrost interact. Ice petrography proved especially useful for differentiating ice of past glaciers versus ice formed under permafrost conditions. These two mechanisms of ice formation are common in the Maritime Alps where many sites of modem rock glaciers were formerly occupied by LIA glaciers Article in Journal/Newspaper Ice permafrost IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) Quaternary Research 68 3 353 363 |
institution |
Open Polar |
collection |
IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) |
op_collection_id |
ftuninsubriairis |
language |
unknown |
topic |
rock glacier debris-covered glacier glacier permafrost DC resistivity ice petrography holocene maritime Alps |
spellingShingle |
rock glacier debris-covered glacier glacier permafrost DC resistivity ice petrography holocene maritime Alps RIBOLINI A CHELLI A PAPPALARDO M. GUGLIELMIN, MAURO Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy |
topic_facet |
rock glacier debris-covered glacier glacier permafrost DC resistivity ice petrography holocene maritime Alps |
description |
In the Schiantala Valley of the Maritime Alps, the relationship between a till-like body and a contiguous rock glacier has been analyzed using geomorphologic, geoelectric and ice-petrographic methodologies. DC resistivity tomographies undertaken in the till and in the rock glacier show the presence of buried massive ice and ice-rich sediments, respectively. Ice samples from a massive ice outcrop show spherical gas inclusions and equidimensional ice crystals that are randomly orientated, confirming the typical petrographic characteristics of sedimentary ice. The rock glacier formation began after a phase of glacier expansion about 2550+/-50 C-14 yr BP. Further ice advance during the Little Ice Age (LIA) overrode the rock glacier root and caused partial shrinkage of the pre-existing permafrost. Finally, during the 19th and 20th centuries, the glacial surface became totally debris covered. Geomorphological and geophysical methods combined with analyses of ice structure and fabric can effectively interpret the genesis of landforms in an environment where glaciers and permafrost interact. Ice petrography proved especially useful for differentiating ice of past glaciers versus ice formed under permafrost conditions. These two mechanisms of ice formation are common in the Maritime Alps where many sites of modem rock glaciers were formerly occupied by LIA glaciers |
author2 |
Ribolini, A Chelli, A Guglielmin, Mauro Pappalardo, M. |
format |
Article in Journal/Newspaper |
author |
RIBOLINI A CHELLI A PAPPALARDO M. GUGLIELMIN, MAURO |
author_facet |
RIBOLINI A CHELLI A PAPPALARDO M. GUGLIELMIN, MAURO |
author_sort |
RIBOLINI A |
title |
Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy |
title_short |
Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy |
title_full |
Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy |
title_fullStr |
Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy |
title_full_unstemmed |
Relationships between glacier and rock glacier in the Maritime Alps,Schiantala Valley, Italy |
title_sort |
relationships between glacier and rock glacier in the maritime alps,schiantala valley, italy |
publishDate |
2007 |
url |
http://hdl.handle.net/11383/1674312 https://doi.org/10.1016/j.yqres.2007.08.004 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000250629300006 volume:68 firstpage:353 lastpage:363 numberofpages:11 journal:QUATERNARY RESEARCH http://hdl.handle.net/11383/1674312 doi:10.1016/j.yqres.2007.08.004 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-35348835942 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.yqres.2007.08.004 |
container_title |
Quaternary Research |
container_volume |
68 |
container_issue |
3 |
container_start_page |
353 |
op_container_end_page |
363 |
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1796310734829780992 |