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Bailey, Ian; Foster, Gavin L; Wilson, Paul A; Jovane, Luigi; Storey, Craig D; Trueman, Clive N; Becker, Julia (2012): Feldspar Pb-isotope ratios for earliest Pleistocene sediments of the sub-polar North Atlantic Ocean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.786098, Supplement to: Bailey, I et al. (2012): Flux and provenance of ice-rafted debris in the earliest Pleistocene sub-polar North Atlantic Ocean comparable to the last glacial maximum. Earth and Planetary Science Letters, 341-344, 222-233, https://doi.org/10.1016/j.epsl.2012.05.034

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Abstract:
Relatively little is known in detail about the locations of the early Pleistocene ice-sheets responsible for ice-rafted debris (IRD) inputs to the sub-polar North Atlantic Ocean during intensification of northern hemisphere glaciation (iNHG). To shed new light on this problem, we present the first combined in-depth analysis of IRD flux and geochemical provenance of individual sand-sized IRD deposited in the sub-polar North Atlantic Ocean during the earliest large amplitude Pleistocene glacial, marine isotope stage (MIS) 100 (~2.52 Ma), arguably the key glacial during iNHG. IRD provenance is assessed using laser ablation lead (Pb) isotope analyses of single feldspar grains. We find that the Pb-isotope composition (206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb) of individual ice-rafted (>150 µm) feldspars deposited at DSDP Site 611A, ODP Site 981 and IODP Site U1308 during MIS 100 records a shift from predominantly Archaean-aged circum-North Atlantic Ocean continental sources during early glacial ice-rafting events to dominantly Palaeozoic and Proterozoic-aged sources during full glacial conditions. The distribution of feldspars in Pb-Pb space for full glacial MIS 100 more closely resembles that documented for feldspars deposited at the centre of the last glacial IRD belt (at IODP/DSDP Site U1308/609) during ambient (non-Heinrich-event) ice-rafting episodes of MIS 2 (~23.8 ka) than that documented for MIS 5d (~106 ka). Comparison of our early Pleistocene and last glacial cycle datasets suggests that MIS 100 was characterised by abundant iceberg calving from large ice-sheets on multiple continents in the high northern latitudes (not just on Greenland).
Project(s):
Deep Sea Drilling Project (DSDP)
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 51.579646 * Median Longitude: -22.810641 * South-bound Latitude: 49.877767 * West-bound Longitude: -30.309700 * North-bound Latitude: 55.477500 * East-bound Longitude: -14.650800
Date/Time Start: 1983-07-22T00:00:00 * Date/Time End: 1995-07-15T03:15:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets

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Datasets listed in this publication series

  1. Bailey, I; Foster, GL; Wilson, PA et al. (2012): Last Glacial Cycle individual sand-sized (>150 µm) feldspar Pb-isotope ratios. https://doi.org/10.1594/PANGAEA.786097
  2. Bailey, I; Foster, GL; Wilson, PA et al. (2012): Marine Isotope Stage 100 (2.52 Ma) individual sand-sized (>150 µm) feldspar Pb-isotope ratios. https://doi.org/10.1594/PANGAEA.786096