Core scans and lithologic analysis of Subglacial Lake Whillans sediment cores

Autoria(s): Hodson, Timothy O; Powell, Ross; Brachfield, Stefanie; Tulaczyk, Slawek; Scherer, Reed P; WISSARD Science Team
Cobertura

LATITUDE: -82.375000 * LONGITUDE: -168.625000
Data(s)

27/04/2016
Resumo

The hydrologic system beneath the Antarctic Ice Sheet is thought to influence both the dynamics and distribution of fast flowing ice streams, which discharge most of the ice lost by the ice sheet. Despite considerable interest in understanding this subglacial network and its affect on ice flow, in situ observations from the ice sheet bed are exceedingly rare. Here we describe the first sediment cores recovered from an active subglacial lake. The lake, known as Subglacial Lake Whillans, is part of a broader, dynamic hydrologic network beneath the Whillans Ice Stream in West Antarctica. Even though "floods" pass through the lake, the lake floor shows no evidence of erosion or deposition by flowing water. By inference, these floods must have insufficient energy to erode or transport significant volumes of sediment coarser than silt. Consequently, water flow beneath the region is probably incapable of incising continuous channels into the bed and instead follows preexisting subglacial topography and surface slope. Sediment on the lake floor consists of till deposited during intermittent grounding of the ice stream following flood events. The fabrics within the till are weaker than those thought to develop in thick deforming beds suggesting subglacial sediment fluxes across the ice plain are currently low and unlikely to have a large stabilizing effect on the ice stream's grounding zone.
Formato

application/zip, 15 datasets
Identificador

https://doi.pangaea.de/10.1594/PANGAEA.859990

doi:10.1594/PANGAEA.859990
Idioma(s)

en
Publicador

PANGAEA
Relação

Subglacial Lake Whillans sediment cores - Readme (URI: hdl:10013/epic.47719.d002)
Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted
Fonte

Supplement to: Hodson, Timothy O; Powell, Ross; Brachfield, Stefanie; Tulaczyk, Slawek; Scherer, Reed P; WISSARD Science Team (2016): Physical processes in Subglacial Lake Whillans, West Antarctica: inferences from sediment cores. Earth and Planetary Science Letters, 444, 56-63, doi:10.1016/j.epsl.2016.03.036
Palavras-Chave #<2 µm, >9 phi; 0.01 µm; 0.0114 µm; 0.0129 µm; 0.0147 µm; 0.0167 µm; 0.0189 µm; 0.0215 µm; 0.0244 µm; 0.0278 µm; 0.0315 µm; 0.0358 µm; 0.0407 µm; 0.0463 µm; 0.0526 µm; 0.0597 µm; 0.0679 µm; 0.0771 µm; 0.0876 µm; 0.0995 µm; 0.113 µm; 0.128 µm; 0.146 µm; 0.166 µm; 0.188 µm; 0.214 µm; 0.243 µm; 0.276 µm; 0.314 µm; 0.357 µm; 0.405 µm; 0.46 µm; 0.523 µm; 0.594 µm; 0.5 phi; -0.5 phi; 0.675 µm; 0.767 µm; 0.872 µm; 0.991 µm; 0 phi; 1.13 µm; 1.28 µm; 1.45 µm; 1.5 phi; -1.5 phi; 1.65 µm; 1.88 µm; 10.5 phi; 10 phi; 11.2 µm; 11.5 phi; 111 µm; 1110 µm; 11 phi; 12.5 phi; 12.7 µm; 1260 µm; 127 µm; 12 phi; 13.5 phi; 13 phi; 14.5 µm; 14.5 phi; 1430 µm; 144 µm; 14 phi; 15.5 phi; 15 phi; 16.4 µm; 16.5 phi; 163 µm; 1630 µm; 16 phi; 18.7 µm; 1850 µm; 186 µm; 1 phi; -1 phi; 2.13 µm; 2.42 µm; 2.5 phi; 2.75 µm; 21.2 µm; 2100 µm; 211 µm; 2390 µm; 24.1 µm; 240 µm; 27.4 µm; 2710 µm; 272 µm; 2 phi; -2 phi; 3.12 µm; 3.55 µm; 3.5 phi; 3080 µm; 31.1 µm; 310 µm; 35.3 µm; 352 µm; 3 phi; 4.03 µm; 4.58 µm; 4.5 phi; 40.1 µm; 400 µm; 45.6 µm; 454 µm; 4 phi; 5.21 µm; 5.5 phi; 5.92 µm; 51.8 µm; 516 µm; 58.9 µm; 586 µm; 5 phi; 6.5 phi; 6.72 µm; 66.9 µm; 666 µm; 6 phi; 7.5 phi; 7.64 µm; 756 µm; 76 µm; 7 phi; 8.5 phi; 8.68 µm; 859 µm; 86.4 µm; 8 phi; 9.5 phi; 9.86 µm; 976 µm; 98.1 µm; 9 phi; Al; Aluminium; Ar; Argon; Au; Ba; Barium; bulk; Ca; Calcium; Ce; Cerium; Chlorine; Chromium; Cl; Copper; Cr; Cu; D(Kint); D(Kmax); D(Kmin); Decl (AF); Decl (NRM); Declination of principle axis K1; Declination of principle axis K2; Declination of principle axis K3; Demagnetization step; Demag step; Density, wet bulk; Depth; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth bot; Depth top; Event; Fe; Fraction; Ga; Gallium; Gamma-ray attenuation (GRA) densitometer; Ge; Germanium; Gold; Grain size, Mastersizer 3000, Malvern Instrument Inc.; Hafnium; Hf; I(Kint); I(Kmax); I(Kmin); Incl (AF); Incl (NRM); Inclination of principle axis K1; Inclination of principle axis K2; Inclination of principle axis K3; Inten (NRM); Iron; K; Kappabridge, AGICO KLY-4; K int; K max; K min; Label; Lead; MAD; Magnetic susceptibility; Magnetometer, spinner, AGICO JR-6; MAGS; Manganese; Maximum angular deviation; mean; Mn; MUC; MultiCorer; Multi-Sensor Core Logger, GEOTEK; Nd; Neodymium; NRM, Declination; NRM, Declination after demagnetisation; NRM, Inclination; NRM, Inclination after demagnetisation; NRM, Intensity; P; Palladium; Pb; PC; PCOR; Pd; Percussion corer; Phosphorus; Piston corer; Platinum; Pos; Position, lenght; Potassium; Principal component analyses (PCA); Principle axes K1 of normalized anisotropy tensor; Principle axes K2 of normalized anisotropy tensor; Principle axes K3 of normalized anisotropy tensor; Pt; range maximum; range minimum; Rb; Rubidium; S; Samarium; Sample code/label; Sand; Si; Silicon; Silt; Size fraction; Size fraction < 0.002 mm, > 9 phi, clay; SLW1_PC1; SLW1_PEC1; SLW1_SLW_MC1A; SLW1_SLW_MC3A; Sm; Sr; Strontium; Sulfur; Ta; Tantalum; Th; Thorium; Ti; Titanium; Tungsten; U; Uniform resource locator/link to raw data file; Uranium; URL raw; V; Vanadium; W; WBD; X-ray fluorescence ITRAX core scanner; Y; Yttrium; Zinc; Zirconium; Zn; Zr
Tipo

Dataset
Acesso ao item digital