Research Update: Priscu Research Group

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Research Update Priscu Research Group

• NGRIP Pink Ice
• Vostok Ice
• Drilling Fluid Migration in Ice
• Particle characterization in ice coresWAIS
  DIVIDE (biotic vs abiotic)
• Lake Vida Project

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Basal pink ice from the NorthGRIP core
Photo credits Dorthe Dahl-Jensen
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Subglacial Iron discharge from Blood Falls,
Taylor Glacier, MCM Dry Valleys
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ethanol
ethanol
ethanol
ethanol
glycol
NMR Spectra NGRIP
ethanol
ethanol
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NGRIP Pink Ice
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Preliminary NGRIP basal ice results
DRILLING FLUID CONTAMINATION IN PINK ICE-100 mM
to 20 mM ethanol-Ethylene glycol and peaks in
the aromatic/amine and hydrocarbon
region -Redrilling of frozen water questionable
for scientific assessment PARTICLES IN PINK
ICE-Nearly all material mineral-Grain size
fairly homogenous at 1-5mm subangular -A few
larger grains up to 30mm mainly
biotite MINERALS IN PINK ICE -Quartz,
Amphibole, Albite, Hornblende, and K-feldspar
with Fe coating and FeOxide coating on
biotite.-All primary rock forming minerals,
consistent with subglacial till.CELL NUMBERS IN
PINK ICE-1.60.38 x 103 cells ml-1 (Sample
A3) IN GLACIAL ICE-some large organic
fragments up to 100mm long (not seen in the pink
ice)-little mineral material.
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Vostok Ice Core Work
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Cell Counts Versus Depth in Vostok 5G
depth (meters)
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Drilling Fluid (JP8 jet fuel) movement in ice
30 cm
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6.5 cm
Tube 1-2 mm dia
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Characterization of particles in ice cores
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Lake Vida Project 2005-06
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Characterization of particles in ice cores
100
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Percentage of cells
Cell lysis
Nucleic acids
Intact Membrane
Metabolic activity
Light Scatter
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CTC TOPRO-3 SYTO
TIME IN ICE
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Rapid vertical and lateral movement along grain
boundaries
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NGRIP Pink Ice