Pleistocene permafrost features in soils in the South-western Italian Alps
Because of extensive Pleistocenic glaciations which erased most of the previously existing soils, slope steepness and climatic conditions favoring soil erosion, most soils observed on the Alps (and in other mid-latitude mountain ranges) developed only during the Holocene. However, in few sites, part...
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ftunivmilanoair:oai:air.unimi.it:2434/874629 2024-01-28T10:08:36+01:00 Pleistocene permafrost features in soils in the South-western Italian Alps D'Amico Michele Catoni Marcella Bonifacio Eleonora Zanini Ermanno M. D'Amico M. Catoni E. Bonifacio E. Zanini 2015 http://hdl.handle.net/2434/874629 http://meetingorganizer.copernicus.org/EGU2015/EGU2015-14185.pdf eng eng General Assembly EGU http://hdl.handle.net/2434/874629 http://meetingorganizer.copernicus.org/EGU2015/EGU2015-14185.pdf Settore AGR/14 - Pedologia Settore GEO/04 - Geografia Fisica e Geomorfologia info:eu-repo/semantics/conferenceObject 2015 ftunivmilanoair 2024-01-02T23:53:10Z Because of extensive Pleistocenic glaciations which erased most of the previously existing soils, slope steepness and climatic conditions favoring soil erosion, most soils observed on the Alps (and in other mid-latitude mountain ranges) developed only during the Holocene. However, in few sites, particularly in the outermost sections of the Alpine range, Pleistocene glaciers covered only small and scattered surfaces because of the low altitude reached in the basins, and ancient soils could be preserved for long periods of time on particularly stable surfaces. In some cases, these soils retain good memories of past periglacial activity. We described and sampled soils on stable surfaces in the Upper Tanaro valley, Ligurian Alps (Southwestern Piemonte, Italy). The sampling sites were between 600 to 1600 m of altitude, under present day lower montane Castanea sativa/Ostrya carpinifolia forests, montane Fagus sylvatica and Pinus uncinata forests or montane heath/grazed grassland, on different quartzitic substrata. The surface morphology often showed strongly developed, fossil periglacial patterned ground forms, such as coarse stone circles on flat surfaces, or stone stripes on steeper slopes. The stone circles could be up to 5 m wide, while the sorted stripes could be as wide as 12-15 m. A strong lateral cryogenic textural sorting characterized the fine fraction too, with sand dominating close to the stone rims of the patterned ground features and silt and clay the central parts. The surface 60-120 cm of the soils were podzolized during the Holocene; as a result of the textural lateral sorting, the thickness of the podzolic E and Bs horizons varied widely across the patterns. The lower boundary of the Holocene Podzols was abrupt, and corresponded with dense layers with thick coarse laminar structure and illuvial silt accumulation (Cjj horizons). Dense Cjj diapiric inclusions were sometimes preserved in the central parts of the patterns. Where cover beds were developed, more superimposed podzol cycles were observed: ... Conference Object permafrost The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Settore AGR/14 - Pedologia Settore GEO/04 - Geografia Fisica e Geomorfologia |
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Settore AGR/14 - Pedologia Settore GEO/04 - Geografia Fisica e Geomorfologia D'Amico Michele Catoni Marcella Bonifacio Eleonora Zanini Ermanno Pleistocene permafrost features in soils in the South-western Italian Alps |
topic_facet |
Settore AGR/14 - Pedologia Settore GEO/04 - Geografia Fisica e Geomorfologia |
description |
Because of extensive Pleistocenic glaciations which erased most of the previously existing soils, slope steepness and climatic conditions favoring soil erosion, most soils observed on the Alps (and in other mid-latitude mountain ranges) developed only during the Holocene. However, in few sites, particularly in the outermost sections of the Alpine range, Pleistocene glaciers covered only small and scattered surfaces because of the low altitude reached in the basins, and ancient soils could be preserved for long periods of time on particularly stable surfaces. In some cases, these soils retain good memories of past periglacial activity. We described and sampled soils on stable surfaces in the Upper Tanaro valley, Ligurian Alps (Southwestern Piemonte, Italy). The sampling sites were between 600 to 1600 m of altitude, under present day lower montane Castanea sativa/Ostrya carpinifolia forests, montane Fagus sylvatica and Pinus uncinata forests or montane heath/grazed grassland, on different quartzitic substrata. The surface morphology often showed strongly developed, fossil periglacial patterned ground forms, such as coarse stone circles on flat surfaces, or stone stripes on steeper slopes. The stone circles could be up to 5 m wide, while the sorted stripes could be as wide as 12-15 m. A strong lateral cryogenic textural sorting characterized the fine fraction too, with sand dominating close to the stone rims of the patterned ground features and silt and clay the central parts. The surface 60-120 cm of the soils were podzolized during the Holocene; as a result of the textural lateral sorting, the thickness of the podzolic E and Bs horizons varied widely across the patterns. The lower boundary of the Holocene Podzols was abrupt, and corresponded with dense layers with thick coarse laminar structure and illuvial silt accumulation (Cjj horizons). Dense Cjj diapiric inclusions were sometimes preserved in the central parts of the patterns. Where cover beds were developed, more superimposed podzol cycles were observed: ... |
author2 |
M. D'Amico M. Catoni E. Bonifacio E. Zanini |
format |
Conference Object |
author |
D'Amico Michele Catoni Marcella Bonifacio Eleonora Zanini Ermanno |
author_facet |
D'Amico Michele Catoni Marcella Bonifacio Eleonora Zanini Ermanno |
author_sort |
D'Amico Michele |
title |
Pleistocene permafrost features in soils in the South-western Italian Alps |
title_short |
Pleistocene permafrost features in soils in the South-western Italian Alps |
title_full |
Pleistocene permafrost features in soils in the South-western Italian Alps |
title_fullStr |
Pleistocene permafrost features in soils in the South-western Italian Alps |
title_full_unstemmed |
Pleistocene permafrost features in soils in the South-western Italian Alps |
title_sort |
pleistocene permafrost features in soils in the south-western italian alps |
publishDate |
2015 |
url |
http://hdl.handle.net/2434/874629 http://meetingorganizer.copernicus.org/EGU2015/EGU2015-14185.pdf |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
General Assembly EGU http://hdl.handle.net/2434/874629 http://meetingorganizer.copernicus.org/EGU2015/EGU2015-14185.pdf |
_version_ |
1789337532246261760 |