Title of article
Evidence for glaciation in the Northern Hemisphere back to 44 Ma from ice-rafted debris in the Greenland Sea
Author/Authors
Tripati، نويسنده , , Aradhna K. and Eagle، نويسنده , , Robert A. and Morton، نويسنده , , Andrew and Dowdeswell، نويسنده , , Julian A. and Atkinson، نويسنده , , Katie L. and Bahé، نويسنده , , Yannick and Dawber، نويسنده , , Caroline F. and Khadun، نويسنده , , Emma and Shaw، نويسنده , , Ruth M.H. and Shorttle، نويسنده , , Oliver and Thanabalasundaram، نويسنده , , Lavaniya، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
11
From page
112
To page
122
Abstract
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.
Keywords
Polar climate , greenhouse–icehouse transition , paleoclimate , Northern Hemisphere glaciation , ice-rafted debris , Eocene–Oligocene transition
Journal title
Earth and Planetary Science Letters
Serial Year
2008
Journal title
Earth and Planetary Science Letters
Record number
2326316
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