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) Objectives
(5) Catchment Stability
E
T
A
L
E
N
E
C
O
L
O
H
legend:
peat Y
L
diamicton R
A
slope creep and wash E abrasion detritus weathering debris
E
volcanites N
E
fluvial deposits C
O
T permafrost table E
S
T
I
A polygonal ice wedges E
L
L
bands of ice lenses P 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