The long-chain alkenones in the upper layers of bottom sediments of salt lakes in Southern Siberia as a potential biomarker of paleo-climate

  • Bulkhin A.O. 1, 2
  • Rogozin D.Yu. 1
  • 1 Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), Akademgorodok Str., 50/50, Krasnoyarsk region, Krasnoyarsk, 660036, Russia
    2 Siberian Federal University (SibFU), 79 Svobodny Ave, Krasnoyarsk region, Krasnoyarsk, 660041, Russia
Keywords: Alkenones, paleoproxies, paleoclimatology, haptophyta algae, bottom sediments.

Abstract

The long-chain alkenones in the upper layers of the bottom sediments of ten salt lakes in Southern Siberia were collected as a bio-marker for paleo-limnological studies in the summer 2019. The quantitative and qualitative composition of long-chain alkenones were determined by means of gas chromatography mass spectrometry. Also, the possibility of using this class of compounds as a salt-sensitive bio-marker for paleoclimatic reconstructions in the corresponding regions was assess. The results showed that the extracted alkenones are a mixture of several fractions with different lengths of the carbon chain and the number of double bonds. The alkenone C37:4 fractions positively correlate with the salinity of the studied lakes and can serve as a marker of salinity in paleo-climatic reconstructions.
Published
2020-08-27
Section
Articles