Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic
Seismic profiles of Far East Russian Lake El'gygytgyn, formed by a meteorite impact some 3.6 million years ago, show a stratified sediment succession that can be separated into subunits Ia and Ib at approximately 167 m below lake floor (=~3.17 Ma). The upper (Ia) is well-stratified, while the l...
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ftdoajarticles:oai:doaj.org/article:05ad2102f0ab48af99cce88da117b33e 2023-05-15T15:13:17+02:00 Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic A. C. Gebhardt A. Francke J. Kück M. Sauerbrey F. Niessen V. Wennrich M. Melles 2013-08-01T00:00:00Z https://doi.org/10.5194/cp-9-1933-2013 https://doaj.org/article/05ad2102f0ab48af99cce88da117b33e EN eng Copernicus Publications http://www.clim-past.net/9/1933/2013/cp-9-1933-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-1933-2013 1814-9324 1814-9332 https://doaj.org/article/05ad2102f0ab48af99cce88da117b33e Climate of the Past, Vol 9, Iss 4, Pp 1933-1947 (2013) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/cp-9-1933-2013 2022-12-31T04:42:59Z Seismic profiles of Far East Russian Lake El'gygytgyn, formed by a meteorite impact some 3.6 million years ago, show a stratified sediment succession that can be separated into subunits Ia and Ib at approximately 167 m below lake floor (=~3.17 Ma). The upper (Ia) is well-stratified, while the lower is acoustically more massive and discontinuous. The sediments are intercalated with frequent mass movement deposits mainly in the proximal areas, while the distal region is almost free of such deposits at least in the upper part. In spring 2009, a long core drilled in the lake center within the framework of the International Continental Scientific Drilling Program (ICDP) penetrated the entire lacustrine sediment succession down to ~320 m below lake floor and about 200 m farther into the meteorite-impact-related bedrock. Downhole logging data down to 390 m below lake floor show that the bedrock and the lacustrine part differ significantly in their petrophysical characteristics. The contact between the bedrock and the lacustrine sediments is not abrupt, but rather transitional with a variable mixture of impact-altered bedrock clasts in a lacustrine matrix. Physical and chemical proxies measured on the cores can be used to divide the lacustrine part into five different statistical clusters. These can be plotted in a redox-condition vs. input-type diagram, with total organic carbon content and magnetic susceptibility values indicating anoxic or oxic conditions and with the Si / Ti ratio representing more clastic or more biogenic input. Plotting the clusters in this diagram allows identifying clusters that represent glacial phases (cluster I), super interglacials (cluster II), and interglacial phases (clusters III and IV). Article in Journal/Newspaper Arctic Magnetic susceptibility Directory of Open Access Journals: DOAJ Articles Arctic Climate of the Past 9 4 1933 1947 |
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Open Polar |
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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 A. C. Gebhardt A. Francke J. Kück M. Sauerbrey F. Niessen V. Wennrich M. Melles Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Seismic profiles of Far East Russian Lake El'gygytgyn, formed by a meteorite impact some 3.6 million years ago, show a stratified sediment succession that can be separated into subunits Ia and Ib at approximately 167 m below lake floor (=~3.17 Ma). The upper (Ia) is well-stratified, while the lower is acoustically more massive and discontinuous. The sediments are intercalated with frequent mass movement deposits mainly in the proximal areas, while the distal region is almost free of such deposits at least in the upper part. In spring 2009, a long core drilled in the lake center within the framework of the International Continental Scientific Drilling Program (ICDP) penetrated the entire lacustrine sediment succession down to ~320 m below lake floor and about 200 m farther into the meteorite-impact-related bedrock. Downhole logging data down to 390 m below lake floor show that the bedrock and the lacustrine part differ significantly in their petrophysical characteristics. The contact between the bedrock and the lacustrine sediments is not abrupt, but rather transitional with a variable mixture of impact-altered bedrock clasts in a lacustrine matrix. Physical and chemical proxies measured on the cores can be used to divide the lacustrine part into five different statistical clusters. These can be plotted in a redox-condition vs. input-type diagram, with total organic carbon content and magnetic susceptibility values indicating anoxic or oxic conditions and with the Si / Ti ratio representing more clastic or more biogenic input. Plotting the clusters in this diagram allows identifying clusters that represent glacial phases (cluster I), super interglacials (cluster II), and interglacial phases (clusters III and IV). |
format |
Article in Journal/Newspaper |
author |
A. C. Gebhardt A. Francke J. Kück M. Sauerbrey F. Niessen V. Wennrich M. Melles |
author_facet |
A. C. Gebhardt A. Francke J. Kück M. Sauerbrey F. Niessen V. Wennrich M. Melles |
author_sort |
A. C. Gebhardt |
title |
Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic |
title_short |
Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic |
title_full |
Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic |
title_fullStr |
Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic |
title_full_unstemmed |
Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic |
title_sort |
petrophysical characterization of the lacustrine sediment succession drilled in lake el'gygytgyn, far east russian arctic |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-1933-2013 https://doaj.org/article/05ad2102f0ab48af99cce88da117b33e |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Magnetic susceptibility |
genre_facet |
Arctic Magnetic susceptibility |
op_source |
Climate of the Past, Vol 9, Iss 4, Pp 1933-1947 (2013) |
op_relation |
http://www.clim-past.net/9/1933/2013/cp-9-1933-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-1933-2013 1814-9324 1814-9332 https://doaj.org/article/05ad2102f0ab48af99cce88da117b33e |
op_doi |
https://doi.org/10.5194/cp-9-1933-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
4 |
container_start_page |
1933 |
op_container_end_page |
1947 |
_version_ |
1766343851255005184 |