Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany
An excellent section in the Welzow‐Süd open‐cast lignite mine in Lower Lusatia, eastern Germany, provided a rare opportunity to study a small (5 m deep), buried subglacial meltwater channel of Saalian age. The channel is steep‐sided and distinctly U‐shaped. It is separated from undeformed outwash de...
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Online Access: | http://dx.doi.org/10.1111/j.1502-3885.1999.tb00226.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1999.tb00226.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1999.tb00226.x |
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crwiley:10.1111/j.1502-3885.1999.tb00226.x 2024-06-02T08:08:18+00:00 Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany PIOTROWSKI, JAN A. GELETNEKY, JÖRN VATER, RALF 1999 http://dx.doi.org/10.1111/j.1502-3885.1999.tb00226.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1999.tb00226.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1999.tb00226.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 28, issue 3, page 363-374 ISSN 0300-9483 1502-3885 journal-article 1999 crwiley https://doi.org/10.1111/j.1502-3885.1999.tb00226.x 2024-05-03T10:57:30Z An excellent section in the Welzow‐Süd open‐cast lignite mine in Lower Lusatia, eastern Germany, provided a rare opportunity to study a small (5 m deep), buried subglacial meltwater channel of Saalian age. The channel is steep‐sided and distinctly U‐shaped. It is separated from undeformed outwash deposits in which it is incised by a sharp erosional contact and it is filled with meltwater sand and till. The till was possibly squeezed into the channel from the adjacent ice/bed interface. Directly beneath the channel, there is a partly truncated diapir of clayey silt, evidencing sediment intrusion into the channel from below. During channel formation, the pressure gradient was oriented from the surrounding sediments into the channel, so that the channel served as a drainage conduit for groundwater from the adjacent subglacial aquifer. The substratum consists largely of sandy aquifers with a total thickness of about 100 m, separated by two aquitards. Channel formation was initiated when hydraulic transmissivity of the bed did not suffice to evacuate all the subglacial meltwater as groundwater flow. As the Welzow‐Süd channel belongs to a dense network of subglacial channels in eastern Germany, temporary ice‐sheet instability in this region prior to channel formation seems possible. Article in Journal/Newspaper Ice Sheet Wiley Online Library Boreas 28 3 363 374 |
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Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
An excellent section in the Welzow‐Süd open‐cast lignite mine in Lower Lusatia, eastern Germany, provided a rare opportunity to study a small (5 m deep), buried subglacial meltwater channel of Saalian age. The channel is steep‐sided and distinctly U‐shaped. It is separated from undeformed outwash deposits in which it is incised by a sharp erosional contact and it is filled with meltwater sand and till. The till was possibly squeezed into the channel from the adjacent ice/bed interface. Directly beneath the channel, there is a partly truncated diapir of clayey silt, evidencing sediment intrusion into the channel from below. During channel formation, the pressure gradient was oriented from the surrounding sediments into the channel, so that the channel served as a drainage conduit for groundwater from the adjacent subglacial aquifer. The substratum consists largely of sandy aquifers with a total thickness of about 100 m, separated by two aquitards. Channel formation was initiated when hydraulic transmissivity of the bed did not suffice to evacuate all the subglacial meltwater as groundwater flow. As the Welzow‐Süd channel belongs to a dense network of subglacial channels in eastern Germany, temporary ice‐sheet instability in this region prior to channel formation seems possible. |
format |
Article in Journal/Newspaper |
author |
PIOTROWSKI, JAN A. GELETNEKY, JÖRN VATER, RALF |
spellingShingle |
PIOTROWSKI, JAN A. GELETNEKY, JÖRN VATER, RALF Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany |
author_facet |
PIOTROWSKI, JAN A. GELETNEKY, JÖRN VATER, RALF |
author_sort |
PIOTROWSKI, JAN A. |
title |
Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany |
title_short |
Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany |
title_full |
Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany |
title_fullStr |
Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany |
title_full_unstemmed |
Soft‐bedded subglacial meltwater channel from the Welzow‐Süd opencast lignite mine, Lower Lusatia, eastern Germany |
title_sort |
soft‐bedded subglacial meltwater channel from the welzow‐süd opencast lignite mine, lower lusatia, eastern germany |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.1111/j.1502-3885.1999.tb00226.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1999.tb00226.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1999.tb00226.x |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Boreas volume 28, issue 3, page 363-374 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1502-3885.1999.tb00226.x |
container_title |
Boreas |
container_volume |
28 |
container_issue |
3 |
container_start_page |
363 |
op_container_end_page |
374 |
_version_ |
1800753513896083456 |