Journal
QUATERNARY SCIENCE REVIEWS
Volume 209, Issue -, Pages 40-51Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2019.01.015
Keywords
Plio-Pleistocene transition; Northern Hemisphere glaciation; Paleoclimatology; Paleoceanography; Paleomagnetism; Greenland Ice Sheet; North Atlantic; Ice-rafted debris; Relative paleointensity
Funding
- European Consortium for Ocean Research Drilling (ECORD)
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We present new sedimentological and environmental magnetic records spanning similar to 3.2-2.2 Ma, during the intensification of Northern Hemisphere glaciation, from North Atlantic Integrated Ocean Drilling Program Site U1307 on Eirik Drift. Our new datasets and their high-fidelity age control demonstrate that while inland glaciers - and potentially also at times restricted iceberg-calving margins - have likely existed on southern Greenland since at least similar to 3.2 Ma, persistent and extensive iceberg-calving glacial margins were only established in this region at 2.72 Ma, similar to 300 kyr later than in northeastern and eastern Greenland. Despite a dramatic increase in Greenland-sourced ice-rafted debris deposition on Eirik Drift at this time, contemporaneous changes in the bulk magnetic properties of Site U1307 sediments, and a reduction in sediment accumulation rates, suggest a decrease in the delivery of Greenland-sourced glaciofluvial silt to our study site. We attribute these changes to a shift in depositional regime from bottom-current-dominated to glacial-IRD-dominated between similar to 2.9 and 2.7 Ma, in response to a change in the depth of the flow path of the Western Boundary Undercurrent relative to our study site. (C) 2019 Elsevier Ltd. All rights reserved.
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