Andrews, John T; Bigg, Grant R; Wilton, David J (2014): Holocene sediment transport from the glaciated margin of East/Northeast Greenland to the N Iceland shelves [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.855087, Supplement to: Andrews, JT et al. (2014): Holocene ice-rafting and sediment transport from the glaciated margin of East Greenland (67–70°N) to the N Iceland shelves: detecting and modelling changing sediment sources. Quaternary Science Reviews, 91, 204-217, https://doi.org/10.1016/j.quascirev.2013.08.019
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Abstract:
We examine variations in the ice-rafted sources for sediments in the Iceland/East Greenland offshore marine archives by utilizing a sediment unmixing model and link the results to a coupled iceberg-ocean model. Surface samples from around Iceland and along the E/NE Greenland shelf are used to define potential sediment sources, and these are examined within the context of the down-core variations in mineralogy in the <2 mm sediment fraction from a transect of cores across Denmark Strait. A sediment unmixing model is used to estimate the fraction of sediment <2 mm off NW and N Iceland exported across Denmark Strait; this averaged between 10 and 20%. Both the sediment unmixing model and the coupled iceberg-ocean model are consistent in finding that the fraction of "far-travelled" sediments in the Denmark Strait environs is overwhelmingly of local, mid-East Greenland, provenance, and therefore with a significant cross-channel component to their travel. The Holocene record of ice-rafted sediments denotes a three-part division of the Holocene in terms of iceberg sediment transport with a notable increase in the process starting ca 4000 cal yr BP. This latter increase may represent the re-advance during the Neoglacial period of land-terminating glaciers on the Geikie Plateau to become marine-terminating. The contrast in spectral signals between these cores and the 1500-yr cycle at VM28-14, just south of the Denmark Strait, combined with the coupled iceberg-model results, leads us to speculate that the signal at VM28-14 reflects pulses in overflow waters, rather than an ice-rafted signal.
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Coverage:
Median Latitude: 66.929055 * Median Longitude: -24.321416 * South-bound Latitude: 66.679000 * West-bound Longitude: -30.827830 * North-bound Latitude: 67.136330 * East-bound Longitude: -17.961000
Date/Time Start: 1999-08-01T00:00:00 * Date/Time End: 1999-08-01T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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6 datasets
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Datasets listed in this publication series
- Andrews, JT; Bigg, GR; Wilton, DJ (2012): (Table 2) Mineral abundances in sediment cores HU93030-19B and MD99-2322. https://doi.org/10.1594/PANGAEA.855100
- Andrews, JT; Bigg, GR; Wilton, DJ (2014): (Table 4) Mineral composition in sediment core JR51GC-35. https://doi.org/10.1594/PANGAEA.855054
- Andrews, JT; Bigg, GR; Wilton, DJ (2014): (Table 9) SedUnMix estimated contribution from sources and standard deviations on the estimates for sediment core JR51GC-35. https://doi.org/10.1594/PANGAEA.855085
- Andrews, JT; Bigg, GR; Wilton, DJ (2014): (Table 8) SedUnMix estimated contribution from sources and standard deviations on the estimates for sediment cores MD99-2263 and MD99-2264. https://doi.org/10.1594/PANGAEA.855067
- Andrews, JT; Bigg, GR; Wilton, DJ (2014): (Table 3) Mineral composition in sediment cores MD99-2263 and MD99-2264. https://doi.org/10.1594/PANGAEA.855053
- Andrews, JT; Bigg, GR; Wilton, DJ (2014): (Table 7) SedUnMix estimated contribution from sources and standard deviations on the estimates for sediment cores MD99-2322 and HU93030-019. https://doi.org/10.1594/PANGAEA.855149