Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive
The combination of permafrost history and dynamics, lake level changes and the tectonical framework is considered to play a crucial role for sediment delivery to El'gygytgyn Crater Lake, NE Russian Arctic. The purpose of this study is to propose a depositional framework based on analyses of the...
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Copernicus Publications
2012
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Online Access: | https://doi.org/10.5194/cp-8-1897-2012 https://doaj.org/article/2d6b3b6d65d24b6c855ce28ba7acdb76 |
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ftdoajarticles:oai:doaj.org/article:2d6b3b6d65d24b6c855ce28ba7acdb76 2023-05-15T15:17:49+02:00 Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive G. Schwamborn G. Fedorov N. Ostanin L. Schirrmeister A. Andreev the El'gygytgyn Scientific Party 2012-11-01T00:00:00Z https://doi.org/10.5194/cp-8-1897-2012 https://doaj.org/article/2d6b3b6d65d24b6c855ce28ba7acdb76 EN eng Copernicus Publications http://www.clim-past.net/8/1897/2012/cp-8-1897-2012.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-8-1897-2012 1814-9324 1814-9332 https://doaj.org/article/2d6b3b6d65d24b6c855ce28ba7acdb76 Climate of the Past, Vol 8, Iss 6, Pp 1897-1911 (2012) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2012 ftdoajarticles https://doi.org/10.5194/cp-8-1897-2012 2022-12-30T22:55:57Z The combination of permafrost history and dynamics, lake level changes and the tectonical framework is considered to play a crucial role for sediment delivery to El'gygytgyn Crater Lake, NE Russian Arctic. The purpose of this study is to propose a depositional framework based on analyses of the core strata from the lake margin and historical reconstructions from various studies at the site. A sedimentological program has been conducted using frozen core samples from the 141.5 m long El'gygytgyn 5011-3 permafrost well. The drill site is located in sedimentary permafrost west of the lake that partly fills the El'gygytgyn Crater. The total core sequence is interpreted as strata building up a progradational alluvial fan delta. Four macroscopically distinct sedimentary units are identified. Unit 1 (141.5–117.0 m) is comprised of ice-cemented, matrix-supported sandy gravel and intercalated sandy layers. Sandy layers represent sediments which rained out as particles in the deeper part of the water column under highly energetic conditions. Unit 2 (117.0–24.25 m) is dominated by ice-cemented, matrix-supported sandy gravel with individual gravel layers. Most of the Unit 2 diamicton is understood to result from alluvial wash and subsequent gravitational sliding of coarse-grained (sandy gravel) material on the basin slope. Unit 3 (24.25–8.5 m) has ice-cemented, matrix-supported sandy gravel that is interrupted by sand beds. These sandy beds are associated with flooding events and represent near-shore sandy shoals. Unit 4 (8.5–0.0 m) is ice-cemented, matrix-supported sandy gravel with varying ice content, mostly higher than below. It consists of slope material and creek fill deposits. The uppermost metre is the active layer (i.e. the top layer of soil with seasonal freeze and thaw) into which modern soil organic matter has been incorporated. The nature of the progradational sediment transport taking place from the western and northern crater margins may be related to the complementary occurrence of frequent turbiditic layers ... Article in Journal/Newspaper Arctic Ice permafrost Directory of Open Access Journals: DOAJ Articles Arctic Crater Lake ENVELOPE(-60.667,-60.667,-62.983,-62.983) Climate of the Past 8 6 1897 1911 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 G. Schwamborn G. Fedorov N. Ostanin L. Schirrmeister A. Andreev the El'gygytgyn Scientific Party Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
The combination of permafrost history and dynamics, lake level changes and the tectonical framework is considered to play a crucial role for sediment delivery to El'gygytgyn Crater Lake, NE Russian Arctic. The purpose of this study is to propose a depositional framework based on analyses of the core strata from the lake margin and historical reconstructions from various studies at the site. A sedimentological program has been conducted using frozen core samples from the 141.5 m long El'gygytgyn 5011-3 permafrost well. The drill site is located in sedimentary permafrost west of the lake that partly fills the El'gygytgyn Crater. The total core sequence is interpreted as strata building up a progradational alluvial fan delta. Four macroscopically distinct sedimentary units are identified. Unit 1 (141.5–117.0 m) is comprised of ice-cemented, matrix-supported sandy gravel and intercalated sandy layers. Sandy layers represent sediments which rained out as particles in the deeper part of the water column under highly energetic conditions. Unit 2 (117.0–24.25 m) is dominated by ice-cemented, matrix-supported sandy gravel with individual gravel layers. Most of the Unit 2 diamicton is understood to result from alluvial wash and subsequent gravitational sliding of coarse-grained (sandy gravel) material on the basin slope. Unit 3 (24.25–8.5 m) has ice-cemented, matrix-supported sandy gravel that is interrupted by sand beds. These sandy beds are associated with flooding events and represent near-shore sandy shoals. Unit 4 (8.5–0.0 m) is ice-cemented, matrix-supported sandy gravel with varying ice content, mostly higher than below. It consists of slope material and creek fill deposits. The uppermost metre is the active layer (i.e. the top layer of soil with seasonal freeze and thaw) into which modern soil organic matter has been incorporated. The nature of the progradational sediment transport taking place from the western and northern crater margins may be related to the complementary occurrence of frequent turbiditic layers ... |
format |
Article in Journal/Newspaper |
author |
G. Schwamborn G. Fedorov N. Ostanin L. Schirrmeister A. Andreev the El'gygytgyn Scientific Party |
author_facet |
G. Schwamborn G. Fedorov N. Ostanin L. Schirrmeister A. Andreev the El'gygytgyn Scientific Party |
author_sort |
G. Schwamborn |
title |
Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive |
title_short |
Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive |
title_full |
Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive |
title_fullStr |
Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive |
title_full_unstemmed |
Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive |
title_sort |
depositional dynamics in the el'gygytgyn crater margin: implications for the 3.6 ma old sediment archive |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/cp-8-1897-2012 https://doaj.org/article/2d6b3b6d65d24b6c855ce28ba7acdb76 |
long_lat |
ENVELOPE(-60.667,-60.667,-62.983,-62.983) |
geographic |
Arctic Crater Lake |
geographic_facet |
Arctic Crater Lake |
genre |
Arctic Ice permafrost |
genre_facet |
Arctic Ice permafrost |
op_source |
Climate of the Past, Vol 8, Iss 6, Pp 1897-1911 (2012) |
op_relation |
http://www.clim-past.net/8/1897/2012/cp-8-1897-2012.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-8-1897-2012 1814-9324 1814-9332 https://doaj.org/article/2d6b3b6d65d24b6c855ce28ba7acdb76 |
op_doi |
https://doi.org/10.5194/cp-8-1897-2012 |
container_title |
Climate of the Past |
container_volume |
8 |
container_issue |
6 |
container_start_page |
1897 |
op_container_end_page |
1911 |
_version_ |
1766348082191007744 |