New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard
The objective of this study were Little Ice Age (LIA) to recent subglacial tills, glaciofluvial sediments of proglacial sandur, esker sediments and sediments of moraine-mound complexes of Hrbyebreen polythermal valley glacier and LIA to recent sediments of lateral moraine, frontal moraine, ice-cored...
Published in: | Czech Polar Reports |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Masaryk University Press
2013
|
Subjects: | |
Online Access: | http://dx.doi.org/10.5817/cpr2013-2-13 https://journals.muni.cz/CPR/article/viewFile/12834/11166 |
id |
crmasarykunivpr:10.5817/cpr2013-2-13 |
---|---|
record_format |
openpolar |
spelling |
crmasarykunivpr:10.5817/cpr2013-2-13 2024-09-15T18:07:57+00:00 New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard Hanáček, Martin Nývlt, Daniel Flašar, Jan Stacke, Václav Mida, Peter Lehejček, Jiří Tóthová, Gabriela Břežný, Michal Procházková, Barbora Uxa, Tomáš Křenovská, Iva 2013 http://dx.doi.org/10.5817/cpr2013-2-13 https://journals.muni.cz/CPR/article/viewFile/12834/11166 unknown Masaryk University Press http://creativecommons.org/licenses/by-nc-nd/4.0 Czech Polar Reports volume 3, issue 2, page 107-129 ISSN 1805-0697 1805-0689 journal-article 2013 crmasarykunivpr https://doi.org/10.5817/cpr2013-2-13 2024-07-11T04:18:15Z The objective of this study were Little Ice Age (LIA) to recent subglacial tills, glaciofluvial sediments of proglacial sandur, esker sediments and sediments of moraine-mound complexes of Hrbyebreen polythermal valley glacier and LIA to recent sediments of lateral moraine, frontal moraine, ice-cored moraine and glaciofluvial sediments of proglacial sandur of Bertilbreen polythermal valley glacier. Fossil (probably early Holocene) subglacial and supraglacial tills and sediments of coarse-grained glaciomarginal delta of Bertilbreen have also been studied. The research focused on Old Red sandstone clasts, for which roundness, shape and striation presence have been investigated. The results from this research led to the proposal of new methodological approaches. It is mainly the covariant plot of striations and RA (the share of striated clasts versus the share of very angular and angular clasts), which effectively differentiate subglacial tills from glaciofluvial sediments and allows for identification of the source material of moraine-mound complexes, especially the oldest, more degraded parts near the maximum LIA glacier extent. The second is the covariant plot of distance and RS index (the distance from the starting point versus the share of subangular and subrounded clasts) to present downstream roundness trends in proglacial glaciofluvial sediments. The research confirmed the crucial role of lithological properties of thinly bedded rocks on the shape of these rock clasts in sediment and a minimum impact of passive and active transport on the clast shape modification. Article in Journal/Newspaper glacier Svalbard Munipress - Masaryk University Press Czech Polar Reports 3 2 107 129 |
institution |
Open Polar |
collection |
Munipress - Masaryk University Press |
op_collection_id |
crmasarykunivpr |
language |
unknown |
description |
The objective of this study were Little Ice Age (LIA) to recent subglacial tills, glaciofluvial sediments of proglacial sandur, esker sediments and sediments of moraine-mound complexes of Hrbyebreen polythermal valley glacier and LIA to recent sediments of lateral moraine, frontal moraine, ice-cored moraine and glaciofluvial sediments of proglacial sandur of Bertilbreen polythermal valley glacier. Fossil (probably early Holocene) subglacial and supraglacial tills and sediments of coarse-grained glaciomarginal delta of Bertilbreen have also been studied. The research focused on Old Red sandstone clasts, for which roundness, shape and striation presence have been investigated. The results from this research led to the proposal of new methodological approaches. It is mainly the covariant plot of striations and RA (the share of striated clasts versus the share of very angular and angular clasts), which effectively differentiate subglacial tills from glaciofluvial sediments and allows for identification of the source material of moraine-mound complexes, especially the oldest, more degraded parts near the maximum LIA glacier extent. The second is the covariant plot of distance and RS index (the distance from the starting point versus the share of subangular and subrounded clasts) to present downstream roundness trends in proglacial glaciofluvial sediments. The research confirmed the crucial role of lithological properties of thinly bedded rocks on the shape of these rock clasts in sediment and a minimum impact of passive and active transport on the clast shape modification. |
format |
Article in Journal/Newspaper |
author |
Hanáček, Martin Nývlt, Daniel Flašar, Jan Stacke, Václav Mida, Peter Lehejček, Jiří Tóthová, Gabriela Břežný, Michal Procházková, Barbora Uxa, Tomáš Křenovská, Iva |
spellingShingle |
Hanáček, Martin Nývlt, Daniel Flašar, Jan Stacke, Václav Mida, Peter Lehejček, Jiří Tóthová, Gabriela Břežný, Michal Procházková, Barbora Uxa, Tomáš Křenovská, Iva New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard |
author_facet |
Hanáček, Martin Nývlt, Daniel Flašar, Jan Stacke, Václav Mida, Peter Lehejček, Jiří Tóthová, Gabriela Břežný, Michal Procházková, Barbora Uxa, Tomáš Křenovská, Iva |
author_sort |
Hanáček, Martin |
title |
New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard |
title_short |
New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard |
title_full |
New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard |
title_fullStr |
New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard |
title_full_unstemmed |
New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard |
title_sort |
new methods to reconstruct clast transport history in different glacial sedimentary environments: case study for old red sandstone clasts from polythermal hrbyebreen and bertilbreen valley glaciers, central svalbard |
publisher |
Masaryk University Press |
publishDate |
2013 |
url |
http://dx.doi.org/10.5817/cpr2013-2-13 https://journals.muni.cz/CPR/article/viewFile/12834/11166 |
genre |
glacier Svalbard |
genre_facet |
glacier Svalbard |
op_source |
Czech Polar Reports volume 3, issue 2, page 107-129 ISSN 1805-0697 1805-0689 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.5817/cpr2013-2-13 |
container_title |
Czech Polar Reports |
container_volume |
3 |
container_issue |
2 |
container_start_page |
107 |
op_container_end_page |
129 |
_version_ |
1810445316818731008 |