Heavy minerals, grain size distribution, and ice-rafted debris in the Greenland Sea during 44 to 30 Ma

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...

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Bibliographic Details
Main Authors: Tripati, Aradhna K, Eagle, Robert A, Morton, Andrew C, Dowdeswell, Julian A, Atkinson, Katie L, Bahé, Yannick, Dawber, Caroline F, Khadun, Emma, Shaw, Ruth M H, Shorttle, Oliver, Thanabalasundaram, Lavaniya
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
151-913B
DRILL
Drilling/drill rig
Joides Resolution
Leg151
North Greenland Sea
Ocean Drilling Program
ODP
Greenland
Greenland Sea
Ice Sheet
North Atlantic
North Greenland
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.707156
https://doi.org/10.1594/PANGAEA.707156
Description
Summary: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.

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