期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 265, 期 1-2, 页码 112-122出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2007.09.045
关键词
paleoclimate; Northern Hemisphere glaciation; ice-rafted debris; greenhouse-icehouse transition; Eocene-Oligocene transition; polar climate
资金
- NERC [NE/D009049/1] Funding Source: UKRI
- Natural Environment Research Council [NE/C510583/1, NE/D009049/1] Funding Source: researchfish
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 similar to 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. (c) 2007 Elsevier B.V. All rights reserved.
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