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Bender, Vera Barbara; Hanebuth, Till J J; Mena, Anxo; Baumann, Karl-Heinz; Francés, Guillermo; von Dobeneck, Tilo (2012): Controls of sediment dynamics on the Galician slope reconstructed from three sediment cores (GeoB11035-1, GeoB130206-1, GeoB13071-1). PANGAEA, https://doi.org/10.1594/PANGAEA.783579, Supplement to: Bender, VB et al. (2012): Control of sediment supply, palaeoceanography and morphology on late Quaternary sediment dynamics at the Galician continental slope. Geo-Marine Letters, 32(4), 313-335, https://doi.org/10.1007/s00367-012-0282-2

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Abstract:
Controls of sediment dynamics at the Galician continental slope (NW Iberia) during the past 30 ka were reconstructed from three new gravity cores (GeoB11035-1, 130206-1, 13071-1) based on sedimentological (e.g. sortable silt, IRD), micropalaeontological (e.g. coccoliths), geochemical (AMS 14C, XRF) and geophysical (e.g. magnetic susceptibility) diagnostics. The data are consistent with existing regional knowledge that, during marine isotope stages 3-1, variations in detrital input, marine productivity and sea level were the essential drivers of sediment availability on the slope, whereas deep-water current velocities controlled sediment deposition: (1) the period prior to 30 cal ka BP is characterized by minor but systematic variations in various proxies which can be associated with D-O cycles; (2) between 30 and 18 cal ka BP, high detrital input and steady slope-parallel currents led to constant sedimentation; (3) from the LGM until 10 cal ka BP, the shelf-transgressive sea-level rise increased the detrital particle flux; sedimentation was influenced by significantly enhanced deep-water circulation during the Bølling/Allerød, and subsequent slowing during the Younger Dryas; (4) an abrupt and lasting change to hemipelagic sedimentation at ca. 10 cal ka BP was probably due to Holocene warming and decelerated transgression; (5) after 5 cal ka BP, additional input of detrital material to the slope is plausibly linked to the evolution of fine-grained depocentres on the Galician shelf, this being the first report of this close shelf-slope sedimentary linkage off NW Iberia. Furthermore, there is novel evidence of the nowadays strong outer shelf Iberian Poleward Current becoming established at about 15.5 cal ka BP. The data also demonstrate that small-scale morphologic features and local pathways of sediment export from the neighbouring shelf play an important role for sediment distribution on the NW Iberian slope, including a hitherto unknown sediment conduit off the Ría de Arousa. By implication, the impact of local morphology on along- and down-slope sediment dynamics is more complex than commonly considered, and deserves future attention.
Coverage:
Median Latitude: 42.462135 * Median Longitude: -9.705149 * South-bound Latitude: 42.171611 * West-bound Longitude: -9.842500 * North-bound Latitude: 42.808167 * East-bound Longitude: -9.619833
Date/Time Start: 2006-08-31T14:31:00 * Date/Time End: 2008-06-14T15:47:00
Event(s):
GeoB11035-1 * Latitude: 42.171611 * Longitude: -9.657778 * Date/Time: 2006-08-31T14:31:00 * Elevation: -2045.0 m * Recovery: 5.05 m * Campaign: POS342 * Basis: Poseidon * Method/Device: Gravity corer (GC)
GeoB130206-1 (206-1) * Latitude: 42.458500 * Longitude: -9.619833 * Date/Time: 2008-06-14T15:47:00 * Elevation: -1704.0 m * Recovery: 4.85 m * Campaign: POS366/3 * Basis: Poseidon * Method/Device: Gravity corer (GC)
GeoB13071-1 * Latitude: 42.808167 * Longitude: -9.842500 * Date/Time: 2008-06-11T10:15:00 * Elevation: -1092.0 m * Recovery: 2.86 m * Campaign: POS366/3 * Basis: Poseidon * Method/Device: Gravity corer (GC)
Size:
14 datasets

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Datasets listed in this publication series

  1. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 3) Inter-core correlation of Ca/Fe ratios and magnetic susceptibility of sediment core GeoB130206-1. https://doi.org/10.1594/PANGAEA.783422
  2. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 3) Inter-core correlation of Ca/Fe ratios and magnetic susceptibility of sediment core GeoB13071-1. https://doi.org/10.1594/PANGAEA.783421
  3. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 3) Inter-core correlation of Ca/Fe ratios and magnetic susceptibility supported by IRD and N. pachyderma (sin) of sediment core GeoB11035-1. https://doi.org/10.1594/PANGAEA.783420
  4. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 4) Bulk grain size mass frequencies of sediment core GeoB11035-1. https://doi.org/10.1594/PANGAEA.783498
  5. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 4) Decarbonated grain size composition of sediment core GeoB11035-1. https://doi.org/10.1594/PANGAEA.783559
  6. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 4) Lithology of sediment core GeoB11035-1. https://doi.org/10.1594/PANGAEA.783478
  7. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 5) Bulk grain size mass frequencies of sediment core GeoB13071-1. https://doi.org/10.1594/PANGAEA.783499
  8. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 5) Decarbonated grain size mass frequencies of sediment core GeoB13071-1. https://doi.org/10.1594/PANGAEA.783565
  9. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 5) Lithology of sediment core GeoB13071-1. https://doi.org/10.1594/PANGAEA.783479
  10. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 6) Bulk grain size mass frequencies of sediment core GeoB130206-1. https://doi.org/10.1594/PANGAEA.783549
  11. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 6) Decarbonated grain size mass frequencies of sediment core GeoB130206-1. https://doi.org/10.1594/PANGAEA.783569
  12. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 6) Lithology of sediment core GeoB130206-1. https://doi.org/10.1594/PANGAEA.783480
  13. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Fig. 7) Coccolith species abundance of sediment core GeoB11035-1. https://doi.org/10.1594/PANGAEA.783577
  14. Bender, VB; Hanebuth, TJJ; Mena, A et al. (2012): (Table 1) Age model tie points of sediment cores GeoB11035-1, GeoB13071-1, and GeoB130206-1. https://doi.org/10.1594/PANGAEA.783411