Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Volz, Jessica B; Mogollón, José M; Geibert, Walter; Martínez Arbizu, Pedro; Koschinsky, Andrea; Kasten, Sabine (2018): Pore-water manganese, nitrate and oxygen data and solid-phase radionuclide and TOC data for sediment cores taken during R/V SONNE cruise SO239 in the CCZ. PANGAEA, https://doi.org/10.1594/PANGAEA.894864, Supplement to: Volz, JB et al. (2018): Natural spatial variability of depositional conditions, biogeochemical processes and element fluxes in sediments of the eastern Clarion-Clipperton Zone, Pacific Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 140, 159-172, https://doi.org/10.1016/j.dsr.2018.08.006

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
The manganese nodule belt within the Clarion and Clipperton Fracture Zones (CCZ) in the abyssal NE Pacific Ocean is characterized by numerous seamounts, low organic matter (OM) depositional fluxes and meter-scale oxygen penetration depths (OPD) into the sediment. The region hosts contract areas for the exploration of polymetallic nodules and Areas of Particular Environmental Interest (APEI) as protected areas. In order to assess the impact of potential mining on these deep-sea sediments and ecosystems, a thorough determination of the natural spatial variability of depositional and geochemical conditions as well as biogeochemical processes and element fluxes in the different exploration areas is required.
Here, we present a comparative study on (1) sedimentation rates and bioturbation depths, (2) redox zonation of the sediments and element fluxes as well as (3) rates and pathways of biogeochemical reactions at six sites in the eastern CCZ. The sites are located in four European contract areas and in the APEI3. Our results demonstrate that the natural spatial variability of depositional and (bio)geochemical conditions in this deep-sea sedimentary environment is much larger than previously thought. We found that the OPD varies between 1 and 4.5 m, while the sediments at two sites are oxic throughout the sampled interval (7.5 m depth). Below the OPD, manganese and nitrate reduction occur concurrently in the suboxic zone with pore-water Mn2+ concentrations of up to 25 µM. The thickness of the suboxic zone extends over depth intervals of less than 3 m to more than 8 m. Our data and the applied transport-reaction model suggest that the extension of the oxic and suboxic zones is ultimately determined by the (1) low flux of particulate organic carbon (POC) of 1–2 mg Corg m−2 d−1 to the seafloor, (2) low sedimentation rates between 0.2 and 1.15 cm kyr−1 and (3) oxidation of pore-water Mn2+ at depth. The diagenetic model reveals that aerobic respiration is the main biogeochemical process driving OM degradation. Due to very low POC fluxes of 1 mg Corg m−2 d−1 to the seafloor at the site investigated in the protected APEI3 area, respiration rates are twofold lower than at the other study sites. Thus, the APEI3 site does not represent the (bio)geochemical conditions that prevail in the other investigated sites located in the European contract areas. Lateral variations in surface water productivity are generally reflected in the POC fluxes to the seafloor across the various areas but deviate from this trend at two of the study sites. We suggest that the observed spatial variations in depositional and (bio)geochemical conditions result from differences in the degree of degradation of OM in the water column and heterogeneous sedimentation patterns caused by the interaction of bottom water currents with seafloor topography.
Related to:
Martínez Arbizu, Pedro; Haeckel, Matthias (2015): RV SONNE Fahrtbericht / Cruise Report SO239: EcoResponse assessing the ecology, connectivity and resilience of polymetallic nodule field systems, Balboa (Panama) - Manzanillo (Mexico) 11.03.-30.04.2015. GEOMAR Report (N. Ser.), 25, 204 pp, https://doi.org/10.3289/GEOMAR_REP_NS_25_2015
Project(s):
Coverage:
Median Latitude: 14.014616 * Median Longitude: -125.166504 * South-bound Latitude: 11.075670 * West-bound Longitude: -130.139830 * North-bound Latitude: 18.792330 * East-bound Longitude: -117.524170
Date/Time Start: 2015-03-28T09:09:00 * Date/Time End: 2015-04-22T12:07:00
Size:
23 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )

Datasets listed in this publication series

  1. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Ex-situ oxygen data of sediment cores retrieved during R/V SONNE cruise SO239 in the APEI3 area. https://doi.org/10.1594/PANGAEA.894782
  2. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Ex-situ oxygen data of sediment cores retrieved during R/V SONNE cruise SO239 in the BGR area. https://doi.org/10.1594/PANGAEA.894848
  3. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Ex-situ oxygen data of sediment cores retrieved during R/V SONNE cruise SO239 in the GSR area. https://doi.org/10.1594/PANGAEA.894849
  4. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Ex-situ oxygen data of sediment cores retrieved during R/V SONNE cruise SO239 in the IFREMER-1 area. https://doi.org/10.1594/PANGAEA.894850
  5. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Ex-situ oxygen data of sediment cores retrieved during R/V SONNE cruise SO239 in the IFREMER-2 area. https://doi.org/10.1594/PANGAEA.894851
  6. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Ex-situ oxygen data of sediment cores retrieved during R/V SONNE cruise SO239 in the IOM area. https://doi.org/10.1594/PANGAEA.894852
  7. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Pore-water manganese and nitrate data of sediment cores retrieved during R/V SONNE cruise SO239 in the APEI3 area. https://doi.org/10.1594/PANGAEA.894777
  8. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Pore-water manganese and nitrate data of sediment cores retrieved during R/V SONNE cruise SO239 in the BGR area. https://doi.org/10.1594/PANGAEA.894818
  9. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Pore-water manganese and nitrate data of sediment cores retrieved during R/V SONNE cruise SO239 in the GSR area. https://doi.org/10.1594/PANGAEA.894819
  10. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Pore-water manganese and nitrate data of sediment cores retrieved during R/V SONNE cruise SO239 in the IFREMER-1 area. https://doi.org/10.1594/PANGAEA.894824
  11. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Pore-water manganese and nitrate data of sediment cores retrieved during R/V SONNE cruise SO239 in the IFREMER-2 area. https://doi.org/10.1594/PANGAEA.894832
  12. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Pore-water manganese and nitrate data of sediment cores retrieved during R/V SONNE cruise SO239 in the IOM area. https://doi.org/10.1594/PANGAEA.894842
  13. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Solid-phase radionuclide data of sediment core SO239_121-1 retrieved during R/V SONNE cruise SO239 in the GSR area. https://doi.org/10.1594/PANGAEA.894859
  14. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Solid-phase radionuclide data of sediment core SO239_167-1 retrieved during R/V SONNE cruise SO239 in the IFREMER-1 area. https://doi.org/10.1594/PANGAEA.894861
  15. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Solid-phase radionuclide data of sediment core SO239_175-1 retrieved during R/V SONNE cruise SO239 in the IFREMER-2 area. https://doi.org/10.1594/PANGAEA.894862
  16. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Solid-phase radionuclide data of sediment core SO239_199-1 retrieved during R/V SONNE cruise SO239 in the APEI3 area. https://doi.org/10.1594/PANGAEA.894794
  17. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Solid-phase radionuclide data of sediment core SO239_84-1 retrieved during R/V SONNE cruise SO239 in the IOM area. https://doi.org/10.1594/PANGAEA.894863
  18. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Total organic carbon contents of sediment cores retrieved during R/V SONNE cruise SO239 in the APEI3 area. https://doi.org/10.1594/PANGAEA.894795
  19. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Total organic carbon contents of sediment cores retrieved during R/V SONNE cruise SO239 in the BGR area. https://doi.org/10.1594/PANGAEA.894854
  20. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Total organic carbon contents of sediment cores retrieved during R/V SONNE cruise SO239 in the GSR area. https://doi.org/10.1594/PANGAEA.894855
  21. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Total organic carbon contents of sediment cores retrieved during R/V SONNE cruise SO239 in the IFREMER-1 area. https://doi.org/10.1594/PANGAEA.894856
  22. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Total organic carbon contents of sediment cores retrieved during R/V SONNE cruise SO239 in the IFREMER-2 area. https://doi.org/10.1594/PANGAEA.894857
  23. Volz, JB; Mogollón, JM; Geibert, W et al. (2018): Total organic carbon contents of sediment cores retrieved during R/V SONNE cruise SO239 in the IOM area. https://doi.org/10.1594/PANGAEA.894858