Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation

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.

Title	Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation
Creator	Xuan, C.
	Carlson, A. E.
	Channell, J. E. T.
	Bailey, I
	Lawrence, Kira T.
	Stoner, J. S.
	Hatfield, R. G.
	Walczak, M.
	Blake-Mizen, K.
Publisher	Quaternary Science Reviews
Academic Department	Geology & Environmental Geosciences
Division	Natural Sciences
Organization	Lafayette College
Date Issued	April 2019
Date Available	2021-04-01
Type	Article
Language	English
Keyword	Paleomagnetism
	North Atlantic Ocean
	Relative paleointensity
	Northern Hemisphere glaciation
	Paleoceanography
	Greenland Ice Sheet
	Plio-Pleistocene transition
	Paleoclimatology
	Ice-rafted debris
Bibliographic Citation	Blake-Mizen, K. (2019 Apr) "Southern Greenland glaciation and Western Boundary Undercurrent evolution recorded on Eirik Drift during the late Pliocene intensification of Northern Hemisphere glaciation." Quaternary Science Reviews 209: 40-51
Standard Identifier	Handle 10385/xd07gt14f
Standard Identifier	DOI 10.1016/j.quascirev.2019.01.015
Permalink	http://hdl.handle.net/10385/xd07gt14f
Rights Statement	In Copyright
Rights Holders	Elsevier Ltd.