Microbiological sampling and analysis of the Outokumpu Deep Borehole biosphere in 2007-2008

Merja Itävaara, Mari Nyyssönen, Malin Bomberg, Anu Kapanen, Aura Nousiainen, Lasse Ahonen, Jenni Hultman, Lars Paulin, Petri Auvinen, Ilmo T. Kukkonen

    Research output: Chapter in Book/Report/Conference proceedingChapter or book articleScientificpeer-review


    Three sampling campaigns were performed during the years 2007-2009 to develop microbiological sampling techniques and to study the deep biosphere in the Outokumpu Deep Drill Hole R2500, drilled into a Palaeoproterozoic sequence of rocks consisting of metasediments, ophiolite-derived altered ultramafic rocks and pegmatitic granite. The results revealed the presence of microbial communities in the saline fluids sampled from the open borehole and fracture systems in the low-porosity crystalline bedrock in Outokumpu. According to the microbiological analyses, the microbial cell density varies from 105 cells ml-1 at the surface to 103 ml-1 at 2350 m depth. The composition of microbial communities in the borehole was found to vary with sampling depth, and the changes appear to be connected to both geological and geochemical factors as well as to fracture zones in the bedrock. Sulphate reducing bacteria and methanogenic archaea are present throughout the borehole water column.
    Original languageEnglish
    Title of host publicationOutokumpu Deep Drilling Project 2003-2010
    EditorsIlmo T. Kukkonen
    Place of PublicationEspoo
    PublisherGeological Survey of Finland
    ISBN (Electronic)978-952-217-152-8
    ISBN (Print)978-952-217-151-1
    Publication statusPublished - 2011
    MoE publication typeA3 Part of a book or another research book

    Publication series

    SeriesGeological Survey of Finland. Special Paper


    • deep drilling
    • bedrock
    • boreholes
    • ground water
    • biosphere
    • microorganisms
    • bacteria
    • Archaea
    • Outokumpu
    • Finland


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