Sedimentation on the Siberian Arctic Shelf as an indicator of the arctic hydrological cycle

Rusakov, V. Yu.; Borisov, A. P.

doi:10.1016/j.ancene.2023.100370

Cited by 9 publications

(1 citation statement)

References 52 publications

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“…About 70% of the sea area is represented by a shelf with a depth of less than 100 m. Because of warming-induced loss of sea ice cover [2], sea level rise [3], and coastal permafrost degradation [4], the Laptev Sea Shelf (LSS) is an ideal nature laboratory for studying the effects of climate change on sedimentation processes in the land-sea system. One example of the feedback of modern sedimentation in the Arctic Seas on climate warming is the reduction in sedimentation rates that is associated with the coastline shift to the south and an increase in the distance to the primary sediment sources [5,6]. Terrigenous sediments deposited in the LSS mainly originate from multiple sources, including material transported by the large Siberian rivers' flow (Khatanga, Lena, Yana [7]) and coastal erosion Quaternary 2024, 7, 12 2 of 18 products [8].…”

Section: Introductionmentioning

confidence: 99%

Rare Earth Elements in Sediments from the Laptev Sea Shelf: Insight into Sources and Distribution Factors

Ruban,

Dudarev,

Rudmin

et al. 2024

Quaternary

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The study of rare earth elements (REEs) in marine sediments is a powerful geochemical tool for determining depositional processes and sediment provenance, as well as for understanding paleoenvironmental changes. In this context, we present REE, some major and trace elements, grain size, and mineralogy data on surface and core sediments, which were collected in different areas of the eastern Laptev Sea Shelf (LSS; Arctic Ocean). The primary objective of this paper was to assess the principal controlling factors influencing REE concentration and their vertical to lateral distribution. The total REE content (ΣREE) ranged from 139 ppm to 239 ppm within the studied sediment samples, predominantly consisting of silt. The normalized REE distribution patterns, based on North American Shale Composite (NASC) standard, exhibited an enrichment in light REE (LREE) when compared to heavy REE (HREE), which is similar to that in Lena River suspended particulate matter. The primary sources of REEs in the eastern LSS were both the suspended particulate matter from the Lena River and sediments originating from the coastal ice complex. The spatial distribution of REEs was primarily contingent upon the distance from sediment sources and prevailing hydrological conditions and was generally characterized by a decrease in REE concentration seaward. There was a moderate positive correlation between ΣREE and mean grain size in the studied surface sediment. However, this relationship was specific only for surface samples and was not found in the sediment cores, indicating that sediment grain size does not play a significant role in the REE vertical distribution. The strong positive correlation between ΣREE and Al, K, Ti, V, Cr, Zr, Hf, and Th suggests that REEs are hosted by not only heavy but also clay minerals. The vertical fluctuations of LREE/HREE, Eu/Eu*, (La/Lu)N can point at variable dominance of one or another REE source for during sediment accumulation.

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