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von Dobeneck, Tilo; Kucera, Michal; Faust, Johan C (2025): Electrical conductivity, porosity and density of 12 gravity cores from RV MARIA S. MERIAN cruise MSM111 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.984159

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Published: 2025-08-15 • DOI registered: 2025-09-15

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Abstract:
All sediment series recovered during MERIAN Cruise MSM 111 by gravity coring were subject to routine electrical conductivity logging, which was performed on the closed full, and largely pore-water-saturated core segments. The electrical conductivity σs or resistivity Rs (=1/σs) of marine sediment is primarily determined by porosity, pore-water saturation, pore-water salinity, and temperature, while electrically conducting matrix components such as clays are of a minor relevance. The electrical conductivity σs was determined using an inductive non-contact 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, calibrated and temperature-corrected (T=20°C) values for conductivity and resistivity.
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. 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 by 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.
The MARUM Multi-Sensor Core Logging System (MSCLS) is mounted with a commercial Geotek non-contact-resistivity (NCR) sensor. For the necessary NCR calibration a set of saline solutions at concentrations of 0.35 - 1.75 - 3.5 - 8.75 - 17.5 - 35 g/l was recorded daily. The resistivity sensor averages over approximately 12 cm core length. The core segment data were numerically corrected for (geometry-related) signal decay within the first and last 14 cm of each segment to ideally create seamless records. Nevertheless, conductivity data of the first and last 5 cm of each segment had to be discarded, as they usually showed artifacts of partial pore-water and/or sediment loss.
Keyword(s):
Conductivity; density; MSM111; porosity; Sediment core
Related to:
Kucera, Michal; Faust, Johan C; Meilland, Julie; D'Mello, Gavin; Janßen, Anjuly; von Dobeneck, Tilo; Schulz, Hartmut; Morard, Raphael; Streuff, Katharina Teresa; de Vernal, Anne; Düßmann, Ralf; Bergenthal, Markus; Linowski, Erik; Fröhlich, Siefke; Ahrlich, Frauke; Schillai, Sophia; Kaszemeik, Kai; Schmidt, Werner; Haider, Fouzia; Detlef, Henrieka; Diekamp, Volker; Siccha, Michael (2023): Deep drilling in the Baffin Bay for marine sediment records of Greenland Ice Sheet collapse during past warm intervals, Cruise No. MSM111, 02.09. - 04.10.2022, Reykjavik (Iceland) - St. John's (Canada). MARIA S. MERIAN-Berichte, Begutachtungspanel Forschungsschiffe, MSM111, 69 pp, https://doi.org/10.48433/cr_msm111
Project(s):
Center for Marine Environmental Sciences (MARUM)
Funding:
German Research Foundation (DFG), grant/award no. 390741603: EXC 2077: The Ocean Floor – Earth's Uncharted Interface
Coverage:
Median Latitude: 66.538132 * Median Longitude: -50.170087 * South-bound Latitude: 60.936760 * West-bound Longitude: -61.305860 * North-bound Latitude: 69.849840 * East-bound Longitude: -28.251050
Date/Time Start: 2022-09-03T12:54:47 * Date/Time End: 2022-09-29T19:01:30
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
12 datasets

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Datasets listed in this publication series

  1. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25201-2. https://doi.org/10.1594/PANGAEA.984114
  2. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25201-3. https://doi.org/10.1594/PANGAEA.984131
  3. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25202-2. https://doi.org/10.1594/PANGAEA.984140
  4. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25206-2. https://doi.org/10.1594/PANGAEA.984144
  5. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25212-2. https://doi.org/10.1594/PANGAEA.984145
  6. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25212-3. https://doi.org/10.1594/PANGAEA.984146
  7. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25217-2. https://doi.org/10.1594/PANGAEA.984147
  8. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25219-1. https://doi.org/10.1594/PANGAEA.984148
  9. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25221-2. https://doi.org/10.1594/PANGAEA.984149
  10. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25222-1. https://doi.org/10.1594/PANGAEA.984150
  11. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25224-1. https://doi.org/10.1594/PANGAEA.984155
  12. von Dobeneck, T; Kucera, M; Faust, JC (2025): Electrical conductivity, porosity and density of sediment core GeoB25226-2. https://doi.org/10.1594/PANGAEA.984156