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Schwamborn, Georg; Meyer, Hanno; Schirrmeister, Lutz; Fedorov, Grigory B (2014): Ground ice hydrochemical composition of permafrost core ICDP5011-3. PANGAEA, https://doi.org/10.1594/PANGAEA.823392, Supplement to: Schwamborn, G et al. (2014): Past freeze and thaw cycling in the margin of the El'gygytgyn crater deduced from a 141 m long permafrost record. Climate of the Past, 10(3), 1109-1123, https://doi.org/10.5194/cp-10-1109-2014

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Abstract:
The continuous sediment record from Lake El'gygytgyn in the northeastern Eurasian Arctic spans the last 3.6 Ma and for much of this time permafrost dynamics and lake level changes have likely played a crucial role for sediment delivery to the lake. Changes in the ground-ice hydrochemical composition (d18O, dD, pH, electrical conductivity, Na+, Mg2+, Ca2+, K+, HCO3-, Cl-, SO4-) of a 141 m long permafrost record from the western crater plain are examined to reconstruct repeated periods of freeze and thaw at the lake edge. Stable water isotope and major ion records of ground ice in the permafrost reflect both a synsedimentary palaeo-precipitation signal preserved in the near-surface permafrost (0.0-9.1 m core depth) and a post-depositional record of thawing and refreezing in deeper layers of the core (9.1-141.0 m core depth). These lake marginal permafrost dynamics were controlled by lake level changes that episodically flooded the surfaces and induced thaw in the underlying frozen ground. During times of lake level fall these layers froze over again. At least three cycles of freeze and thaw are identified and the hydrochemical data point to a vertical and horizontal talik refreezing through time. Past permafrost thaw and freeze may have destabilised the basin slopes of Lake El'gygytgyn and this has probably promoted the release of mass movements from the lake edge to the deeper basin as known from frequently occurring turbidite layers in the lake sediment column.
Coverage:
Latitude: 67.484730 * Longitude: 171.944730
Date/Time Start: 2008-11-23T00:00:00 * Date/Time End: 2008-12-03T00:00:00
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 141.35 m
Event(s):
ICDP5011-3 * Latitude: 67.484730 * Longitude: 171.944730 * Date/Time Start: 2008-11-23T00:00:00 * Date/Time End: 2008-12-03T00:00:00 * Elevation: 500.0 m * Penetration: 141.5 m * Recovery: 130.18 m * Location: Elgygytgyn crater lake, Sibiria, Russia * Campaign: ICDP_Elgygytgyn-Drilling-Project * Basis: Sampling on land * Method/Device: Pneumatic rotary drill "SIF-650M" (PRD)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2Water content, wet massWater wm%Schwamborn, Georg
3δ18O, waterδ18O H2O‰ SMOWSchwamborn, GeorgMass spectrometer Finnigan Delta-S
4δ Deuterium, waterδD H2O‰ SMOWSchwamborn, GeorgMass spectrometer Finnigan Delta-S
5pHpHSchwamborn, GeorgpH-conductivity meter, WTW Multilab 540
6Conductivity, electrolyticECµS/cmSchwamborn, GeorgpH-conductivity meter, WTW Multilab 540
7CalciumCammol/lSchwamborn, GeorgICP-OES, Perkin-Elmer, Optima 3000XL
8Sodium and PotassiumNa+Kmmol/lSchwamborn, GeorgICP-OES, Perkin-Elmer, Optima 3000XL
9MagnesiumMgmmol/lSchwamborn, GeorgICP-OES, Perkin-Elmer, Optima 3000XL
10Chloride ionCl-mmol/lSchwamborn, GeorgIon chromatography DX-320 (Dionex Corp.)
11Sulfate ion[SO4]2-mmol/lSchwamborn, GeorgIon chromatography DX-320 (Dionex Corp.)
12Bicarbonate[HCO3]-mmol/lSchwamborn, GeorgTitration potentiometric, 794 Basic Titrino (Metrohm)
Size:
3202 data points

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