Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean
Abstract Modern techniques for detrital mineral provenance were applied to sediment core 96/12‐1pc from the Lomonosov Ridge in the central Arctic Ocean. The techniques include quantitative clay mineralogy analysis combined with determination of Nd, Pb, and Sr isotopes from clay fraction. The clay mi...
Main Authors: | , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
The Geological Society of Finland
2023
|
Subjects: | |
Online Access: | http://urn.fi/urn:nbn:fi-fe2023081697201 |
id |
ftunivoulu:oai:oulu.fi:nbnfi-fe2023081697201 |
---|---|
record_format |
openpolar |
spelling |
ftunivoulu:oai:oulu.fi:nbnfi-fe2023081697201 2023-09-05T13:16:54+02:00 Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean Alatarvas, R. (Raisa) Immonen, N. (Ninna) Strand, K. (Kari) 2023 application/pdf http://urn.fi/urn:nbn:fi-fe2023081697201 eng eng The Geological Society of Finland info:eu-repo/semantics/openAccess © 2023 Geological Society of Finland. All published content of BGSF is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. https://creativecommons.org/licenses/by-nc/4.0/ Arctic Ocean Lomonosov Ridge Middle Weichselian glaciation Nd-Sr-Pb isotopes clay mineralogy marine sediments info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftunivoulu 2023-08-16T22:59:23Z Abstract Modern techniques for detrital mineral provenance were applied to sediment core 96/12‐1pc from the Lomonosov Ridge in the central Arctic Ocean. The techniques include quantitative clay mineralogy analysis combined with determination of Nd, Pb, and Sr isotopes from clay fraction. The clay mineral assemblage and the isotope signatures depict distinct changes during the Marine Isotope Stage (MIS) 4‐3 transition corresponding to the Middle Weichselian deglaciation. This transition is characterised by a homogenous, 48 cm thick, dark grey, silty clay layer with a distinctive IRD concentration, forming a prominent marker bed for the central Arctic Ocean sediments. The elevated smectite and kaolinite contents in the transitional interval are possible weathering products of the Siberian basaltic rocks, such as the Putorana Plateau, feeding the shelves of the Kara Sea and the western Laptev Sea. The Nd and Sr isotope values are compatible with input from the basaltic rocks and fall within the isotopic range of sediments from these shelves. The abrupt changes in the Nd, Pb and Sr isotopic data from the distinct grey layer attributed to the MIS 4‐3 transition likely mark a pronounced deglaciation event. An increase in coarse debris in the grey layer indicates a change in the sedimentation regime with a strong iceberg rafting component. This change may also be related to a sudden release of meltwater from a large ice-dammed lake in the northern Siberia. Article in Journal/Newspaper Arctic Arctic Ocean Iceberg* Kara Sea laptev Laptev Sea Lomonosov Ridge Siberia Jultika - University of Oulu repository Arctic Arctic Ocean Laptev Sea Kara Sea Dammed Lake ENVELOPE(-68.258,-68.258,68.496,68.496) |
institution |
Open Polar |
collection |
Jultika - University of Oulu repository |
op_collection_id |
ftunivoulu |
language |
English |
topic |
Arctic Ocean Lomonosov Ridge Middle Weichselian glaciation Nd-Sr-Pb isotopes clay mineralogy marine sediments |
spellingShingle |
Arctic Ocean Lomonosov Ridge Middle Weichselian glaciation Nd-Sr-Pb isotopes clay mineralogy marine sediments Alatarvas, R. (Raisa) Immonen, N. (Ninna) Strand, K. (Kari) Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean |
topic_facet |
Arctic Ocean Lomonosov Ridge Middle Weichselian glaciation Nd-Sr-Pb isotopes clay mineralogy marine sediments |
description |
Abstract Modern techniques for detrital mineral provenance were applied to sediment core 96/12‐1pc from the Lomonosov Ridge in the central Arctic Ocean. The techniques include quantitative clay mineralogy analysis combined with determination of Nd, Pb, and Sr isotopes from clay fraction. The clay mineral assemblage and the isotope signatures depict distinct changes during the Marine Isotope Stage (MIS) 4‐3 transition corresponding to the Middle Weichselian deglaciation. This transition is characterised by a homogenous, 48 cm thick, dark grey, silty clay layer with a distinctive IRD concentration, forming a prominent marker bed for the central Arctic Ocean sediments. The elevated smectite and kaolinite contents in the transitional interval are possible weathering products of the Siberian basaltic rocks, such as the Putorana Plateau, feeding the shelves of the Kara Sea and the western Laptev Sea. The Nd and Sr isotope values are compatible with input from the basaltic rocks and fall within the isotopic range of sediments from these shelves. The abrupt changes in the Nd, Pb and Sr isotopic data from the distinct grey layer attributed to the MIS 4‐3 transition likely mark a pronounced deglaciation event. An increase in coarse debris in the grey layer indicates a change in the sedimentation regime with a strong iceberg rafting component. This change may also be related to a sudden release of meltwater from a large ice-dammed lake in the northern Siberia. |
format |
Article in Journal/Newspaper |
author |
Alatarvas, R. (Raisa) Immonen, N. (Ninna) Strand, K. (Kari) |
author_facet |
Alatarvas, R. (Raisa) Immonen, N. (Ninna) Strand, K. (Kari) |
author_sort |
Alatarvas, R. (Raisa) |
title |
Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean |
title_short |
Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean |
title_full |
Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean |
title_fullStr |
Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean |
title_full_unstemmed |
Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean |
title_sort |
clay mineral and nd, pb, and sr isotope provenance of a mis 4‐3 sediment record from the lomonosov ridge, central arctic ocean |
publisher |
The Geological Society of Finland |
publishDate |
2023 |
url |
http://urn.fi/urn:nbn:fi-fe2023081697201 |
long_lat |
ENVELOPE(-68.258,-68.258,68.496,68.496) |
geographic |
Arctic Arctic Ocean Laptev Sea Kara Sea Dammed Lake |
geographic_facet |
Arctic Arctic Ocean Laptev Sea Kara Sea Dammed Lake |
genre |
Arctic Arctic Ocean Iceberg* Kara Sea laptev Laptev Sea Lomonosov Ridge Siberia |
genre_facet |
Arctic Arctic Ocean Iceberg* Kara Sea laptev Laptev Sea Lomonosov Ridge Siberia |
op_rights |
info:eu-repo/semantics/openAccess © 2023 Geological Society of Finland. All published content of BGSF is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. https://creativecommons.org/licenses/by-nc/4.0/ |
_version_ |
1776198309842518016 |