Heavy minerals, grain size distribution, and ice-rafted debris in the Greenland Sea during 44 to 30 Ma
| Cobertura |
LATITUDE: 75.489200 * LONGITUDE: 6.946800 * DATE/TIME START: 1993-09-16T12:17:00 * DATE/TIME END: 1993-09-20T20:30:00 |
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| Data(s) |
10/11/2008
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| Resumo |
The widely accepted age estimate for the onset of glaciation in the Northern Hemisphere ranges between 2 and 15 million years ago (Ma). However, recent studies indicate the date for glacial onset may be significantly older. We report the presence of ice-rafted debris (IRD) in ~44 to 30 Ma sediments from the Greenland Sea, evidence for glaciation in the North Atlantic during the Middle Eocene to Early Oligocene. Detailed sedimentological evidence indicates that glaciers extended to sea level in the region, allowing icebergs to be produced. IRD may have been sourced from tidewater glaciers, small ice caps, and/or a continental ice sheet. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.707156 doi:10.1594/PANGAEA.707156 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Tripati, Aradhna K; Eagle, Robert A; Morton, Andrew C; Dowdeswell, Julian A; Atkinson, Katie L; Bahé, Yannick; Dawber, Caroline F; Khadun, Emma; Shaw, Ruth MH; Shorttle, Oliver; Thanabalasundaram, Lavaniya (2008): Evidence for glaciation in the Northern Hemisphere back to 44 Ma from ice-rafted debris in the Greenland Sea. Earth and Planetary Science Letters, 265(1-2), 112-122, doi:10.1016/j.epsl.2007.09.045 |
| Palavras-Chave | #>2 mm; 1-0.5 mm; 125-63 µm; 151-913B; 2000-630 µm gS; 2-1 mm; 250-125 µm; 500-250 µm; Aeg; Aegirine; Aenigmatite; Age; AGE; Amp; Amphibole; Anatase; And; Andalusite; Ant; Ap; Apatite; Calculated; Chloritoid; Chromspinel; Chromspl; Cld; Clinopyroxene; Cpx; DRILL; Drilling/drill rig; Ep; Epidote; Gahnite; Garnet; Ghn; Grain size, sieving; Grt; Heavy mineral analysis; Ice rafted debris, general; IRD; IRD MAR >250 µm (mg/cm**3/kyr); Joides Resolution; Ky; Kyanite; Leg151; Mass; Mnz; Monazite; North Greenland Sea; Ocean Drilling Program; ODP; ODP sample designation; Ol; Olivine; Opx; Orthopyroxene; Rt; Rutile; Sample code/label; SampleLabel; Sil; Sillimanite; Size fraction > 2 mm, gravel; Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand; Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand; Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand; Size fraction 1.000-0.500 mm, 0.0-1.0 phi, coarse sand; Size fraction 2.000-0.630 mm, coarse sand; Size fraction 2.000-1.000 mm, (-1.0)-0.0 phi, very coarse sand; St; Staurolite; Titanite; Tourmaline; Ttn; Tur; Weighted; Zircon; Zrn |
| Tipo |
Dataset |
