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von Dobeneck, Tilo; Brück, Liane (2020): Electrical conductivity, porosity and density of 21 sediment cores from Maria S. Merian cruise MSM39 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.915498

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Abstract:
The electrical sediment conductivity σs (and reciprocal resistivity Rs) was determined using an inductive GEOTEK non-contact resistivity (NCR) sensor. The system applies high-frequency magnetic fields by a transmitter coil inducing electrical eddy currents in the sediment which are proportional to conductivity. Their secondary field is recorded and yields raw and calibrated values for conductivity and resistivity. The resistivity sensor averages over approximately 12 cm core length. A platinum thermometer inserted into a segment continuously measures sediment temperature for temperature compensation. Absolute sensor calibrations using a series of saline standards are performed daily. For subsequent drift and segment end correction, 29.5 cm long insulating spacers were placed between segments during logging. Thus, the characteristic decay of the eddy currents nearby the end-caps was separately recorded for each segment and corrected on basis of a model curve. This method provides a continuous composite record, however the first 2-3 data points from each intersection were often discarded due to some under- or overshooting.
Porosity was calculated according to the empirical Archie's equation
Rs/Rw = k ∙ φ^(-m)
where the ratio of sediment resistivity Rs and pore water resistivity Rw can be approximated by a power function of porosity φ. Following a recommendation by Boyce (1968), suitable for sea water saturated clay-rich sediments, values of 1.30 and 1.45 were used for the constants k and m, respectively. The calculated porosity φ is subsequently converted to wet bulk density ρwet using the equation (BOYCE, 1976)
ρwet = φ ∙ ρf + (1 - φ) ∙ ρm
with a pore water density ρf of 1030 kg/m³ and a matrix density ρm of 2670 kg/m³. For a uniform treatment of all cores, these empirical coefficients were not adapted to individual sediment lithologies. Yet, relative porosity and density changes should be well documented.
Keyword(s):
density; Electrical conductivity; Grand Banks Margin; MSM39; Northwest Atlantic; porosity
Supplement to:
Mulitza, Stefan; Bergmann, Fenna; Brück, Liane; Chiessi, Cristiano Mazur; Govin, Aline; Klann, Marco; Kuhnert, Henning; Lübben, Birgit; Max, Lars; Meyer, Vera D; Morard, Raphael; Müller, Vasco; Patton, Genevieve; Paul, André; Poirier, André; Riesen, Paul; Schade, Tobias; Stöber, Uwe; Völker, Georg Sebastian; Völpel, Rike; von Dobeneck, Tilo (2015): Cruise No. MSM39 - June 07-June 25, 2014 - St. John's (Canada) - St. John's (Canada). MARIA S. MERIAN-Berichte, DFG-Senatskommission für Ozeanographie, MSM39, 89 pp, https://doi.org/10.2312/cr_msm39
Project(s):
Center for Marine Environmental Sciences (MARUM)
Coverage:
Median Latitude: 46.434040 * Median Longitude: -48.102778 * South-bound Latitude: 41.876833 * West-bound Longitude: -54.761333 * North-bound Latitude: 50.205667 * East-bound Longitude: -44.167333
Date/Time Start: 2014-06-10T16:50:00 * Date/Time End: 2014-06-23T12:17:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
21 datasets

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Datasets listed in this publication series

  1. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18514-2. https://doi.org/10.1594/PANGAEA.915476
  2. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18515-1. https://doi.org/10.1594/PANGAEA.915477
  3. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18516-2. https://doi.org/10.1594/PANGAEA.915478
  4. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18517-1. https://doi.org/10.1594/PANGAEA.915479
  5. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18529-2. https://doi.org/10.1594/PANGAEA.915480
  6. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18530-1. https://doi.org/10.1594/PANGAEA.915481
  7. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18531-1. https://doi.org/10.1594/PANGAEA.915482
  8. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18532-1. https://doi.org/10.1594/PANGAEA.915483
  9. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18533-2. https://doi.org/10.1594/PANGAEA.915484
  10. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18534-1. https://doi.org/10.1594/PANGAEA.915485
  11. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18549-2. https://doi.org/10.1594/PANGAEA.915486
  12. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18550-1. https://doi.org/10.1594/PANGAEA.915487
  13. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18551-2. https://doi.org/10.1594/PANGAEA.915488
  14. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18552-1. https://doi.org/10.1594/PANGAEA.915489
  15. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18553-1. https://doi.org/10.1594/PANGAEA.915490
  16. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18554-1. https://doi.org/10.1594/PANGAEA.915491
  17. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18555-1. https://doi.org/10.1594/PANGAEA.915492
  18. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18556-1. https://doi.org/10.1594/PANGAEA.915493
  19. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18557-2. https://doi.org/10.1594/PANGAEA.915494
  20. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18558-1. https://doi.org/10.1594/PANGAEA.915495
  21. von Dobeneck, T (2020): Electrical conductivity, porosity and density of sediment core GeoB18559-2. https://doi.org/10.1594/PANGAEA.915496