Carbon isotope composition of organic matter in holocene sediments of the White Sea as one of the indicators of sedimentation conditions

Lein, Alla Yu; Novichkova, Ye. A.; Rybalko, A.E.; Иванов, М. В.

doi:10.1134/s1028334x13100152

Cited by 8 publications

(4 citation statements)

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“…In the lower part of the core (sediments of the boreal period), the isotopic composition of C org ranges from −27‰ to −26‰, which indicates the prevalence of terrigenous OM with a small portion of marine OM. According to the quantitative calculation of terrigenous C org using the δ 13 С-C org value via the material-isotope balance equation (Lein et al, 2013), C org is represented by 80–90% by the remains of terrestrial vegetation in the sediments referring to the Boreal period (280–325 cm). In the layer of 270–280 cm, δ 13 С-C org values change sharply to those typical for modern sediments of the White Sea (Lein et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…According to the quantitative calculation of terrigenous C org using the δ 13 С-C org value via the material-isotope balance equation (Lein et al, 2013), C org is represented by 80–90% by the remains of terrestrial vegetation in the sediments referring to the Boreal period (280–325 cm). In the layer of 270–280 cm, δ 13 С-C org values change sharply to those typical for modern sediments of the White Sea (Lein et al, 2013). In the sediments of the Atlantic period (165–280 cm) and the second half of the Subatlantic period (16–30 cm), the isotopic composition of C org varies in a small range from –24.0‰ to –23.5‰.…”

Section: Resultsmentioning

confidence: 99%

“…Down the core, a distribution pattern of the Mn/Fe ratio in the geochemically mobile forms is changed, apparently reflecting the redox conditions of the paleoenvironment. Predominance of terrigenous unavailable OM in sediments of the White Sea, according to δ 13 С-C org data, weakens the activity of microorganisms and the rate of diagenetic processes (Lein et al, 2013). The presence of terrigenous humified OM is one of the reasons for the high-temperature peak (400–450°C) registered during the pyrolysis at all depths of the PSh-6050 sediment core.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the final stage of diagenesis is characterized by the absolute predominance of kerogen in the OM composition. The data on organic carbon isotope composition (δ 13 С-С org ) were taken from (Lein et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

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Postglacial sedimentation in the White Sea (northwestern Russia) reconstructed by integrated microfossil and geochemical data

et al. 2019

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The White Sea being connected with the Arctic Ocean via the Barents Sea has an influence on its water temperature/salinity structures and biological processes and thus has an indirect impact on the Eurasian climate system. In this work, we have managed to find a correspondence between the climate fluctuation in the Holocene and changes in the geochemical and microfossil properties in the sediment core of the White Sea. For the first time, the element speciation in the sediment core covering about 10,000 cal yr BP period was investigated. The cooling periods (the early Holocene and the Subboreal stage) were characterized by a trend of increase in Si, Al, and Ti contents and Ti/Al ratios, which reflect lithogenous contribution, and decrease in geochemically labile forms of trace elements. A significant increase in the content of organic-bound trace elements and biogenic components (Сorg, BSi, and chlorin) was observed during periods of Holocene climatic optimums. The evident relationship between the metal speciation and indicators of the sedimentation paleoenvironment is observed at the stage of the active phase of early diagenesis after the slowing down of the biogeochemical processes. Down-core decrease in the Mn oxyhydroxide content exhibited a weakening of diagenesis processes at the ~130–150 cm depth.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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