Geochemical research
Section editor – PhD in geology and mineralogy Bazhenova T.K.
Article # 40_2018 submitted on 09/19/2018 displayed on website on 11/12/2018
25 p.
pdf Hydrocarbon molecular markers in bottom sediments of focused fluid discharge zones of Lake Baikal
The detailed research of the dispersed organic matter of Lake Baikal bottom sediments including analysis of hydrocarbon molecular markers – n-alkanes, isoprenoids, terpanes and polycyclic aromatic hydrocarbons has been carried out. The distribution of homologues of n-alkanes and their ratios in bottom sediments of the Posol bank-2, where mud breccias, gas-hydrates (bottom stations St1GT3, St1GT8) and authigenic carbonates (St1GT3) were detected, has shown an input of the highly transformed organic matter to the surface sediments likely due to the erosion and redeposition of sediments of the last glacial maximum extension age. Molecular composition of dispersed organic matter of the Ostrov site sediments (St3GC4) attested to the normal type of deposition not influenced by migration processes. Increased values of С12-С21 n-alkanes with an even maximum at С16 have been detected in sediments of station St18GC6 collected near the thermogenic methane seep (Kedr mud volcano), and together with the presence of the low transformed hopane structures (hop-17(21)-enes and hop-13(18)-enes) can testify to the methanotrophic and concomitant chemoorganotrophic microorganisms development in sediments.

Keywords: dispersed organic matter, bottom sediments, hydrocarbon molecular markers, gas-hydrates, methane, focused fluid discharge, mud volcano, Lake Baikal.
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