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Leng, Wei; von Dobeneck, Tilo; Bergmann, Fenna; Just, Janna; Mulitza, Stefan; Chiessi, Cristiano Mazur; St-Onge, Guillaume; Piper, David J W (2018): Physical properties of sediment cores GeoB18514-2, GeoB18515-1, GeoB18516-2, and MD95-2029. PANGAEA, https://doi.org/10.1594/PANGAEA.891154, Supplement to: Leng, W et al. (2018): Sedimentary and rock magnetic signatures and event scenarios of deglacial outburst floods from the Laurentian Channel Ice Stream. Quaternary Science Reviews, 186, 27-46, https://doi.org/10.1016/j.quascirev.2018.01.016

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Abstract:
Eastern Canadian margin sediments bear testimony to several catastrophic deglacial meltwater discharges from the retreating Laurentide Ice Sheet. The reddish-brown plumite layers deposited on the levees of the Laurentian Fan valleys have been recognized as indications of multiple outburst floods between Heinrich events 2 and 1. Five event layers have been consistently recorded in three new gravity cores retrieved on the SW Grand Banks slope and comply with the previously published Laurentian Fan core MD95-2029. The apparently huge extent of these outburst plumes around the Laurentian Fan as well as their causes and consequences are investigated in this study using physical properties, rock magnetic and grain-size analyses, together with seismoacoustic profiling. We provide the first detailed 14C ages of the outburst event sequence and discuss their recurrence intervals in the context of regional ice retreat. Compared to the hemipelagic interlayers, event layers have overall uniform and systematic changes of rock-magnetic properties. Hematite contents increase over time and proximally while magnetite grain sizes fine upwards and spatially away from the fan. Based on the sediment composition and load, we argue that these plumites were formed by recurrent erosion of glacial mud deposits in the Laurentian Channel by meltwater outbursts. Three alternative glaciological scenarios are evaluated: in each case, the provenance of the transported sediment is not an indicator of the precise source of the meltwater.
Coverage:
Median Latitude: 43.686234 * Median Longitude: -54.315183 * South-bound Latitude: 43.113000 * West-bound Longitude: -54.761333 * North-bound Latitude: 44.160833 * East-bound Longitude: -53.266000
Date/Time Start: 1995-06-22T00:00:00 * Date/Time End: 2014-06-11T06:52:00
Size:
17 datasets

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Datasets listed in this publication series

  1. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Color scan (a*) of sediment core MD95-2029. https://doi.org/10.1594/PANGAEA.891148
  2. Leng, W; von Dobeneck, T; Bergmann, F et al. (2019): Grain size data of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.897093
  3. Leng, W; von Dobeneck, T; Bergmann, F et al. (2019): Grain size distribution of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.897105
  4. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Ice-rafted detritus counts of sediment core GeoB18514-2. https://doi.org/10.1594/PANGAEA.891143
  5. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Ice-rafted detritus counts of sediment core GeoB18515-1. https://doi.org/10.1594/PANGAEA.891144
  6. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Ice-rafted detritus counts of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.891145
  7. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Magnetic volume susceptibility of sediment core GeoB18514-2. https://doi.org/10.1594/PANGAEA.891133
  8. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Magnetic volume susceptibility of sediment core GeoB18515-1. https://doi.org/10.1594/PANGAEA.891134
  9. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Magnetic volume susceptibility of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.891135
  10. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Magnetic volume susceptibility of sediment core MD95-2029. https://doi.org/10.1594/PANGAEA.891136
  11. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Radiocarbon ages in 14C conventional and calibrated ages. https://doi.org/10.1594/PANGAEA.891128
  12. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Red-blue ratios of sediment core GeoB18514-2. https://doi.org/10.1594/PANGAEA.891130
  13. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Red-blue ratios of sediment core GeoB18515-1. https://doi.org/10.1594/PANGAEA.891131
  14. Leng, W; von Dobeneck, T; Bergmann, F et al. (2018): Red-blue ratios of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.891132
  15. Leng, W; von Dobeneck, T; Bergmann, F et al. (2019): Rock magnetic properties of sediment core GeoB18514-2. https://doi.org/10.1594/PANGAEA.897149
  16. Leng, W; von Dobeneck, T; Bergmann, F et al. (2019): Rock magnetic properties of sediment core GeoB18515-1. https://doi.org/10.1594/PANGAEA.897150
  17. Leng, W; von Dobeneck, T; Bergmann, F et al. (2019): Rock magnetic properties of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.897151