University of Oulu

Alatarvas, R., Immonen, N., & Strand, K. (2023). Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4-3 sediment record from the Lomonosov Ridge, central Arctic Ocean. Bulletin of the Geological Society of Finland, 95(1), 35–46.

Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean

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Author: Alatarvas, Raisa1; Immonen, Ninna1; Strand, Kari1
Organizations: 1Oulu Mining School, University of Oulu, 90014 Oulun yliopisto, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: The Geological Society of Finland, 2023
Publish Date: 2023-08-16


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.

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Series: Bulletin of the Geological Society of Finland
ISSN: 0367-5211
ISSN-E: 1799-4632
ISSN-L: 0367-5211
Volume: 95
Issue: 1
Pages: 35 - 46
DOI: 10.17741/bgsf/95.1.003
Type of Publication: A1 Journal article – refereed
Field of Science: 1171 Geosciences
Funding: This research was financially supported by the Academy of Finland (project No. 269182) ICE (Indexing transitions in ice sheet decay in the Eurasian Arctic marine and land record).
Academy of Finland Grant Number: 269182
Detailed Information: 269182 (Academy of Finland Funding decision)
Copyright information: © 2023 Geological Society of Finland. All published content of BGSF is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.