Pb isotopes in individual sand-sized (>150 µm) ice-rafted feldspars deposited at subpolar North Atlantic Ocean Deep Sea Drilling Project Site 611 during the late Pliocene (Marine Isotope Stages, MIS, G6 through 100) ...

• Main Authors: Bailey, Ian, Hole, Georgia M, Foster, Gavin L, Wilson, Paul A, Storey, Craig D, Trueman, Clive N, Raymo, Maureen E
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Stratigraphy; Sample ID; Sample code/label; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, error; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, error; Lead-208/Lead-204 ratio; Lead-208/Lead-204 ratio, error; Composite Core; DSDP/ODP/IODP sample designation; Leg94; Glomar Challenger; Deep Sea Drilling Project DSDP; Greenland; Ice Sheet; Nordic Seas; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.815973; https://doi.pangaea.de/10.1594/PANGAEA.815973

The onset of abundant ice-rafted debris (IRD) deposition in the Nordic Seas and subpolar North Atlantic Ocean 2.72 millions of years ago (Ma) is thought to record the Pliocene onset of major northern hemisphere glaciation (NHG) due to a synchronous advance of North American Laurentide, Scandinavian and Greenland ice-sheets to their marine calving margins during marine isotope stage (MIS) G6. Numerous marine and terrestrial records from the Nordic Seas region indicate that extensive ice sheets on Greenland and Scandinavia increased IRD inputs to these seas from 2.72 Ma. The timing of ice-sheet expansion on North America as tracked by IRD deposition in the subpolar North Atlantic Ocean, however, is less clear because both Europe and North America are potential sources for icebergs in this region. Moreover, cosmogenic-dating of terrestrial tills on North America indicate that the Laurentide Ice Sheet did not extend to ~39°N until 2.4 ±0.14 Ma, at least 180 ka after the onset of major IRD deposition at 2.72 Ma. ... : Supplement to: Bailey, Ian; Hole, Georgia M; Foster, Gavin L; Wilson, Paul A; Storey, Craig D; Trueman, Clive N; Raymo, Maureen E (2013): An alternative suggestion for the Pliocene onset of major northern hemisphere glaciation based on the geochemical provenance of North Atlantic Ocean ice-rafted debris. Quaternary Science Reviews, 75(1), 181-194 ...