Geochemical characteristics of organic matter in bottom sediments in ivashkina lagoon (Bykovsky peninsula, Laptev sea)

Elena V.Gershelis Panova, Ivan V. Goncharov, Oleg V. Dudarev, Alexey S. Ruban, Tatyana G. Perevertaylo, Kseniya P. Shcherbakova, Natalia E. Shakhova, Igor P. Semiletov

Research output: Contribution to journalArticle

Abstract

Studying Arctic biogeochemical ecosystem with various methods and approaches is of vital importance to further predict future global climate changes. Organic matter of modern bottom sediments, which accumulates heterogeneous signals of various processes of car8 bon transport and transformation, acts as the unique indicator of initial depositional environment of sediment and its diagenetic histo8 ry. Using high8precision geochemical instruments allows us to obtain important information on potential input of both allochthonous and autochthonous components to organic matter, and thus to further promote understanding of the modern Arctic carbon cycle. The aim of the research is to study the lithological and organo8geochemical features of the sediments accumulated in the specific lagoon conditions of the coastal part of the Laptev Sea (Ivashkina Lagoon, Bykovsky Peninsula). Materials and methods. Precipitation in the area of the Lena river delta was selected as an object of the study. To assess the variability of molecular composition of organic matter in accumulation of sediments, the 188meter interval of the VD813 well, drilled in the central part of the Ivashkina lagoon during the 2013 spring Arctic expedition, was investigated. For the samples, their granulometric characte8 ristics were determined, and pyrolytic and chromatography8mass spectrometric studies were conducted as well. It is shown that the inc8 reased content of organic carbon in the section is confined to the pelitic fraction of sediments. The distribution of n8alkanes is charac8 terized by the dominance of high molecular weight odd homologues, which indicates the ubiquitous contribution of higher terrestrial ve8 getation to formation of organic matter accumulated in sediments. However, the contribution of the potentially migratory organic com8 ponent is not excluded, since the presence of a low molecular weight fraction of n8alkanes is noted for a number of samples. The re8 sults of the pyrolytic analysis of the samples indicate a sharp variability in the content of Corg and volatile organic compounds with depth.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalBulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Volume330
Issue number3
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Bottom sediments
  • East8Siberian shelf
  • Modern sediments
  • Organic carbon
  • Pyrolysis

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Economic Geology
  • Management, Monitoring, Policy and Law

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