Role of lichens in granite weathering in cold and arid environments of continental Antarctica
The mechanical and chemical effects of lichens on the outer and inner surfaces of tafoni features were investigated through a multidisciplinary approach at two locations (Oasi 74°42'S, 164°07'E, 40-250 m a.s.l.; Mount Keinath, 74°32'S; 163°58'E; 850 m a.s.l.) close to the Italian...
Published in: | Geological Society, London, Special Publications |
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Online Access: | http://hdl.handle.net/11383/1786939 https://doi.org/10.1144/SP354.12 |
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ftuninsubriairis:oai:irinsubria.uninsubria.it:11383/1786939 2024-02-11T09:58:09+01:00 Role of lichens in granite weathering in cold and arid environments of continental Antarctica GUGLIELMIN, MAURO Favero Longo S. E. CANNONE, NICOLETTA Piervittori R. Strini A. Guglielmin, Mauro Favero Longo, S. E. Cannone, Nicoletta Piervittori, R. Strini, A. 2011 http://hdl.handle.net/11383/1786939 https://doi.org/10.1144/SP354.12 unknown ispartofbook:SPECIAL PUBLICATION - GEOLOGICAL SOCIETY OF LONDON volume:354 firstpage:195 lastpage:204 numberofpages:10 serie:SPECIAL PUBLICATION - GEOLOGICAL SOCIETY OF LONDON http://hdl.handle.net/11383/1786939 doi:10.1144/SP354.12 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79958808213 info:eu-repo/semantics/bookPart 2011 ftuninsubriairis https://doi.org/10.1144/SP354.12 2024-01-17T17:44:20Z The mechanical and chemical effects of lichens on the outer and inner surfaces of tafoni features were investigated through a multidisciplinary approach at two locations (Oasi 74°42'S, 164°07'E, 40-250 m a.s.l.; Mount Keinath, 74°32'S; 163°58'E; 850 m a.s.l.) close to the Italian Antarctic station (Mario Zucchelli). Outer tafoni roof surfaces show low values of effective porosity coupled with pervasive hyphal penetration and an extensive reddish-brown weathering rind. Inner tafoni surfaces show higher values of effective porosity, which correspond with an almost absent weathering rind and low hyphal penetration. Our observations indicate that: (a) iron oxy-hydroxides, particularly concentrated where hyphal patches and bundles contact biotite, consist of hematite; (b) the microcosms of lichen hyphae and their precipitates fill voids to form case hardening on outer surfaces; and (c) on inner surfaces biological action is less active, most likely because of more intense thermal stress and salt action. Book Part Antarc* Antarctic Antarctica IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) Antarctic Mario Zucchelli ENVELOPE(164.123,164.123,-74.695,-74.695) Keinath ENVELOPE(163.950,163.950,-74.533,-74.533) Mount Keinath ENVELOPE(163.950,163.950,-74.533,-74.533) Geological Society, London, Special Publications 354 1 195 204 |
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Open Polar |
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IRInSubria - Institutional Repository Insubria (Università degli Studi dell’Insubria) |
op_collection_id |
ftuninsubriairis |
language |
unknown |
description |
The mechanical and chemical effects of lichens on the outer and inner surfaces of tafoni features were investigated through a multidisciplinary approach at two locations (Oasi 74°42'S, 164°07'E, 40-250 m a.s.l.; Mount Keinath, 74°32'S; 163°58'E; 850 m a.s.l.) close to the Italian Antarctic station (Mario Zucchelli). Outer tafoni roof surfaces show low values of effective porosity coupled with pervasive hyphal penetration and an extensive reddish-brown weathering rind. Inner tafoni surfaces show higher values of effective porosity, which correspond with an almost absent weathering rind and low hyphal penetration. Our observations indicate that: (a) iron oxy-hydroxides, particularly concentrated where hyphal patches and bundles contact biotite, consist of hematite; (b) the microcosms of lichen hyphae and their precipitates fill voids to form case hardening on outer surfaces; and (c) on inner surfaces biological action is less active, most likely because of more intense thermal stress and salt action. |
author2 |
Guglielmin, Mauro Favero Longo, S. E. Cannone, Nicoletta Piervittori, R. Strini, A. |
format |
Book Part |
author |
GUGLIELMIN, MAURO Favero Longo S. E. CANNONE, NICOLETTA Piervittori R. Strini A. |
spellingShingle |
GUGLIELMIN, MAURO Favero Longo S. E. CANNONE, NICOLETTA Piervittori R. Strini A. Role of lichens in granite weathering in cold and arid environments of continental Antarctica |
author_facet |
GUGLIELMIN, MAURO Favero Longo S. E. CANNONE, NICOLETTA Piervittori R. Strini A. |
author_sort |
GUGLIELMIN, MAURO |
title |
Role of lichens in granite weathering in cold and arid environments of continental Antarctica |
title_short |
Role of lichens in granite weathering in cold and arid environments of continental Antarctica |
title_full |
Role of lichens in granite weathering in cold and arid environments of continental Antarctica |
title_fullStr |
Role of lichens in granite weathering in cold and arid environments of continental Antarctica |
title_full_unstemmed |
Role of lichens in granite weathering in cold and arid environments of continental Antarctica |
title_sort |
role of lichens in granite weathering in cold and arid environments of continental antarctica |
publishDate |
2011 |
url |
http://hdl.handle.net/11383/1786939 https://doi.org/10.1144/SP354.12 |
long_lat |
ENVELOPE(164.123,164.123,-74.695,-74.695) ENVELOPE(163.950,163.950,-74.533,-74.533) ENVELOPE(163.950,163.950,-74.533,-74.533) |
geographic |
Antarctic Mario Zucchelli Keinath Mount Keinath |
geographic_facet |
Antarctic Mario Zucchelli Keinath Mount Keinath |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
ispartofbook:SPECIAL PUBLICATION - GEOLOGICAL SOCIETY OF LONDON volume:354 firstpage:195 lastpage:204 numberofpages:10 serie:SPECIAL PUBLICATION - GEOLOGICAL SOCIETY OF LONDON http://hdl.handle.net/11383/1786939 doi:10.1144/SP354.12 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79958808213 |
op_doi |
https://doi.org/10.1144/SP354.12 |
container_title |
Geological Society, London, Special Publications |
container_volume |
354 |
container_issue |
1 |
container_start_page |
195 |
op_container_end_page |
204 |
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