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Deep Life Workshop, Potsdam, 2014. PIER-ICDP P robing of I ntra-continental magmatic activity: drilling the E ger R ift. T. Dahm 1 , P. Hrubcová 2 , T. Fischer 3 , J. Horálek 2 , M. Korn 4 , S. Buske 5 , D. Wagner 1 1 GFZ German Research Center for Geosciences, Germany

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  1. Deep Life Workshop, Potsdam, 2014 PIER-ICDP Probing of Intra-continental magmatic activity: drilling the Eger Rift T. Dahm1, P. Hrubcová2, T. Fischer3, J. Horálek2, M. Korn4, S. Buske5, D. Wagner1 1GFZ German Research Center for Geosciences, Germany 2Institute of Geophysics, Czech Republic 3Charles University Prague, Czech Republic 4Inst. of Geophysics and Geology, University Leipzig, Germany 5Inst. of Geophysics and Geoinformatics, TU Freiberg, Germany ecotours-russia.com Photo: Torre Jorgenson

  2. Deep biosphere in NW Bohemia/Vogtland: A unique field lab intracontinental non-volcanic rift with complexgeology / tectonics 3 Variscan(Paleozoic to Mesozoic) tectonic units, re-activated (Tertiary), quatern. volcanoes Intersection of Eger Rift and different major faults (seismic hazard?) Earthquake swarms, diffuse CO2 degassing from mantle, thermal/mineral springs Dahm et al., 2013, Scientific Drilling

  3. Objectivesof PIER-ICDP The ICDP Eger Rift project aims to develop the most modern, comprehensive observatory worldwide for the study of earthquake swarms and CO2 degassing in order to reach a new level of high frequency, near-source, and multi-parameter observation of earthquake swarms and related phenomena What are the physical and chemical processes leading to earthquakes and volcanic eruptions? How does fluid transfer through the crust work? How influence geological processes the deep biosphere and the evolution of early life in deep subsurface environments? Interdisciplinary research: Structural geology, geophysics, fluid geochemistry, paleo-volcanology, geomicrobiology related to deep biosphere research

  4. Drilling the Eger Rift: previous steps and future plans Spicak, Förster, Horsfield (2005) Possible design of the observatory at depth by three to four 3D high arrays • 1st Eger Rift WS & pre-proposal (Spicak, Förster, Horsfield, 2005) • 2005-2013: “pre-site studies” (German ICDP) & independent research • 2007: research bundle “swarm earthquakes” (coordinated by Jentzsch et al.) • 2010: NW Bohemia initiative (coordinated by Korn et al.) • 2013: Eger rift workshop at GFZ in Potsdam (assoc. to ICDP) • 2014: full proposal submission Dahm et al., 2013, Scientific Drilling

  5. Study area: main fault zones MLFZ:MariánskéLázně fault zone PPZ:Počatky-Plesná fault zone TFZ:Tachov Fault zone ZH:Železnáhůrka scoria cone MM:Mýtinamaar KH:Komorníhůrkascoriacone Nickschick et al., subm. to IJES

  6. CO2 gas fluxes, Hartoušov CO2-dominated fluids (CO2 conduits, pull apart basin) X 2 magmatic reservoirs in ca. 25-65 km depth X Bacteria: 107cellsL-1 Archaea: 104cells L-1 Nickschick et al., subm. to IJES

  7. Seismicallytriggeredmicrobialmethaneproduction Bräuer et al., 2005, Geochemical J

  8. Origin oflife Deep-reaching tectonic fault systems Raw material incl. phosphate available Supercritical CO2as non-polar solvent Schreiber et al., 2012, Orig Life EvolBiosph

  9. Natural lab fordeepliferesearch Active geodynamic-triggered deep subsurface ecosystem Detailed geophysical and geochemical background knowledge First pre-examination drilling for deep biosphere in August 2015 Multidisciplinary research interest Economic interest: drinking water, spas and resorts Easily accessible and logistically excellent developed

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