Zhang, Yancheng; Chiessi, Cristiano Mazur; Mulitza, Stefan; Zabel, Matthias; Trindade, Ricardo F; Hollanda, Maria Helena B M; Dantas, Elton L; Govin, Aline; Tiedemann, Ralf; Wefer, Gerold (2015): Reconstruction of the provenance and distribution of terrigenous sediments off NE South America over the last 30ka. PANGAEA, https://doi.org/10.1594/PANGAEA.854054, Supplement to: Zhang, Y et al. (2015): Origin of increased terrigenous supply to the NE South American continental margin during Heinrich Stadial 1 and the Younger Dryas. Earth and Planetary Science Letters, 432, 493-500, https://doi.org/10.1016/j.epsl.2015.09.054
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We investigate the redistribution of terrigenous materials in the northeastern (NE) South American continental margin during slowdown events of the Atlantic Meridional Overturning Circulation (AMOC). The compilation of stratigraphic data from 108 marine sediment cores collected across the western tropical Atlantic shows an extreme rise in sedimentation rates off the Parnaíba River mouth (about 2°S) during Heinrich Stadial 1 (HS1, 18-15 ka). Sediment core GeoB16206-1, raised offshore the Parnaíba River mouth, documents relatively constant 143Nd/144Nd values (expressed as epsilonNd(0)) throughout the last 30 ka. Whereas the homogeneous epsilonNd(0) data support the input of fluvial sediments by the Parnaíba River from the same source area directly onshore, the increases in Fe/Ca, Al/Si and Rb/Sr during HS1 indicate a marked intensification of fluvial erosion in the Parnaíba River drainage basin. In contrast, the epsilonNd(0) values from sediment core GeoB16224-1 collected off French Guiana (about 7°N) suggest Amazon-sourced materials within the last 30 ka. We attribute the extremely high volume of terrigenous sediments deposited offshore the Parnaíba River mouth during HS1 to (i) an enhanced precipitation in the catchment region and (ii) a reduced North Brazil Current, which are both associated with a weakened AMOC.
Median Latitude: 1.121889 * Median Longitude: -45.904342 * South-bound Latitude: -31.661667 * West-bound Longitude: -74.800000 * North-bound Latitude: 22.133000 * East-bound Longitude: 0.000000
Date/Time Start: 1957-07-14T00:00:00 * Date/Time End: 2012-03-08T16:07:00
Datasets listed in this publication series
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table 2) Raw 14C AMS data and calibrated ages of sediment cores GeoB16206-1 and GeoB16224-1. https://doi.org/10.1594/PANGAEA.853988
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S1, Figure 2) Sedimentation rates for 108 sediment core sites during the LGM and HS1. https://doi.org/10.1594/PANGAEA.854151
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S2, Figure 3a) Sr-Nd isotopic compositions of sediment cores drilled during MSM20/3. https://doi.org/10.1594/PANGAEA.854052
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S3, Figure 3c) Major element concentrations of sediment core GeoB16206-1. https://doi.org/10.1594/PANGAEA.854046
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S3, Figure 3b) Major element concentrations of sediment core GeoB16224-1. https://doi.org/10.1594/PANGAEA.854047
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S3, Figure 3c) XRF-calibrated ln(Fe/Ca) of sediment core GeoB16206-1. https://doi.org/10.1594/PANGAEA.854043
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S3, Figure 3b) XRF-calibrated ln(Fe/Ca) of sediment core GeoB16224-1. https://doi.org/10.1594/PANGAEA.854044
- Zhang, Y; Chiessi, CM; Mulitza, S et al. (2015): (Table S4, Figures 1 and 4) The ENd(0) notation of sediment samples from geological units in Piauí state, NE Brazil. https://doi.org/10.1594/PANGAEA.854053