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. https://doi.org/10.17741/bgsf/95.1.003
Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4‐3 sediment record from the Lomonosov Ridge, central Arctic Ocean
|Author:||Alatarvas, Raisa1; Immonen, Ninna1; Strand, Kari1|
1Oulu Mining School, University of Oulu, 90014 Oulun yliopisto, Finland
|Online Access:||PDF Full Text (PDF, 0.6 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2023081697201
The Geological Society of Finland,
|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.
Bulletin of the Geological Society of Finland
|Pages:||35 - 46|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
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 (Academy of Finland Funding decision)
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