Analysis of lipid biomarkers in rocks of the Archean crystalline basement

Nina V. Shekhovtsova; George A. Osipov; Nadejda V. Verkhovtseva; Lev A. Pevzner

doi:10.1117/12.486691

30 January 2003 Analysis of lipid biomarkers in rocks of Archean crystalline basement

Nina V. Shekhovtsova, George A. Osipov, Nadejda V. Verkhovtseva, Lev A. Pevzner

Proceedings Volume 4939, Instruments, Methods, and Missions for Astrobiology VI; (2003) https://doi.org/10.1117/12.486691
Event: Instruments, Methods, and Missions for Astrobiology V, 2002, Moscow, Russian Federation

Abstract

The Earst-European platform Archean crystalline basement rocks opened by Vorotilov Deep Well (VDW) were studied within depths 2575 - 2805 m. VDW was drilled through Puchezh-Katunki impact structure and opened some rocks characterized by high magnetic saturation. Micro-dispersed structure of magnetite indicated on a possibility of its biogenic origin. Really some pure cultures of magnet-ordered compound producing bacilli were isolated. Thus, the identification of fatty acids and other lipid components of microbial cells inside rocks was made to establish the iron reduction role in common biochemical activity in deep subsurface. 34 microbial lipid markers were detected by gas chromatography -- mass-spectrometry and 22 species were identidied by private database. Bacteria of g. Bacillus reached 6.8% in subsurface communities. However, representatives of gg. Clostridium (37.1 - 33.2%) and Rhodococcus (27.6 - 33.7%) were absolute dominants within studied depth interval. Geochemical conditions in situ as well as physiological features of these micro-organisms allow to constitute a following trophic chain: subsurface fluid hyudrocarbons → it oxidizing rhodococci → free aminoacids and biomass proteins (products of rhodococci metabolism) → it fermenting clostridia. This syntrophic association may be a new basement for subsurface ecosystem and can support the magnet-ordered compounds production.

Citation Download Citation

Nina V. Shekhovtsova, George A. Osipov, Nadejda V. Verkhovtseva, and Lev A. Pevzner "Analysis of lipid biomarkers in rocks of Archean crystalline basement", Proc. SPIE 4939, Instruments, Methods, and Missions for Astrobiology VI, (30 January 2003); https://doi.org/10.1117/12.486691

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