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Permafrost Sampling I

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Permafrost Sampling I Readyness Review, May 20-21, 2008, NSF Zur Anzeige wird der QuickTime™ Dekompressor „TIFF (Unkomprimiert)“ benötigt. PermafrostPermafrost DrillingDrilling Georg Schwamborn (AWI), Grisha Fedorov (AARI) Martin Melles (Univ. Cologne) W E Solifluction D3D3 LAKE EL´GYGYTGYN D2 Lz1024D1 PG1351 UPPER SEDIMENTARY UNIT LOWER SEDIMENTARY UNIT expected permafrost BRECCIA 500 m 500 m boundary BEDROCK 12 km Objectives (1) Sediment succession in westen crater (overlayn lake sediments ?) (2) Permafrost boundary (extension of talik) Permafrost D3 (< 200 m) m A B ri r te ra c D3 El´gygytgyn 0 Lake A B 40 lake 80 N 5 km 120 depth (m) 160 200 legend: slope deposits / solifluction Talik Permafrost paleo lake sediments Talik fallback breccia original crater floor (approx.) Objectives (3) Paleoclimate 0 δ18O (‰) V-SMOW -30 -25 -20 -15 -10 -5 1 GMWL -50 pore ice -90 upper -130 ) ice wedge m 2 upper ice wedge D (‰) V-SMOW ( samples -170 δ h t lower ice wedge p e d 3 lower after Schwamborn et al. (2007) ice wedge samples 4 ice wedge creek ice remains 5 Objectives (4) Lake-Level History - alluvial accumulation - succession of pebble bars (ancient shorelines) + 10 m unit 3 lake level 0 m Holocene - pebble bar formation -10 m - onset of slope sedimentation + 10 m unit 2 lake level Late 0 m Pleistocene -10 m + 10 m - weathering and erosion of volcanic debris Pre-Late unit 1 0 m Pleistocene volcanic bedrock ? lake level (undated) - 10 m Schwamborn et al. (2007) (5) Catchment Stability (5) Catchment legend: bands ofice lenses polygonal ice wedges permafrost table volcanites weathering debris abrasion detritus diamicton peat fluvial deposits slope creepand wash Objectives PLEISTOCENE HOLOCENE LATE EARLY LATE Schwamborn et al. (2006) Objectives (6) Permafrost Temperature Monitoring IPA-IPY project TSP Operations Plan (1) On-site Work • Drilling in Nov./Dec. 2008 by „Chaun Geological Enterprises“ (CGE), Pevek • Penetration down to 200 m (or 2 sites with about 100 m each) • Air pressure (dry) drilling, cores not in liners • Participants: Pavel Minyuk (PI, NEISRI Magadan) Grisha Fedorov (AARI St. Petersburg) NN Student (AARI St. Petersburg) Georg Schwamborn (AWI Potsdam) Lutz Schirmeister (AWI Potsdam) Bernhard Chabligin (AWI Potsdam) Jochem Kueck (ICDP-OSG, Potsdam) Martin Töpfer (ICDP-OSG, Potsdam) NN Film Team (Hoferichter & Jacobs, Berlin) NN Film Team (Hoferichter & Jacobs, Berlin) Operations Plan (1) On-site Work Sediment Log Cryo Log brown peat m 0 cement-like core documentation diamicton lens-like silty sands 10 sandy silts inclusions - logging / description green peat reticulate banded - labeling 20 pebbles - photography gravels massive - packaging ... ... layered, horizontal 30 layered, vertical borehole properties - magnetic susceptibility - magnetic field - gamma ray spectrum & total - caliper & orientation - permafrost temperature (-monitoring) - additional GPR lines Operations Plan (1) On-site Work • DIP-MAG dipmeter including 3D-magnetometer •SGR gamma spektrum: U, Th, K, total gamma •MS magnetic susceptibility •MP T., p & mud resistivity Operations Plan (2) Off-site Work 14C sedimentology geochemistry 14C dating cryogenic cracking Methane SOM CH4 permafrost gas analysis activity isolation molecular core ecology Operations Plan (2) Off-site Work • Laboratory Analyses - whole-core physical properties magnetic susceptibility AWI Bremerhaven, Germany electrical conductivity AWI Bremerhaven, Germany p-wave velocity AWI Bremerhaven, Germany thermal conductivity GFZ Potsdam, Germany - paleo- and rock magnetics GFZ Potsdam, Germany - cryolithological analyses PIY Irkutsk, Russia - ground ice fabric Univ. Jena, Germany - ground ice chemistry AWI Potsdam, Germany - microbiology AWI Potsdam, Germany - sedimentology and mineralogy AWI Potsdam, Germany - organic geochemistry AWI Potsdam, Germany - geochronology SAW Leipzig, Germany - paleobiology (pollen, diatoms, chiros) AARI St. Petersburg, Russia - paleolimnology (on pot. lake sediments) e.g. Univ. Cologne, Germany • Modeling - permafrost history and talik expension Univ. Dalhousie, USA AWI Potsdam, Germany.
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