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Wei, Jiangong; Pape, Thomas; Sultan, Nabil; Colliat, Jean-Louis; Himmler, Tobias; Ruffine, Livio; de Prunelé, Alexis; Dennielou, Bernard; Garziglia, Sebastien; Marsset, Tania; Peters, Carl A; Rabiu, Abdulkarim; Bohrmann, Gerhard (2015): In-situ sediment temperature and pore water chloride concentration at pockmarks of the Nigerian continental margin. PANGAEA, https://doi.org/10.1594/PANGAEA.845401, Supplement to: Wei, J et al. (2015): Gas hydrate distributions in sediments of pockmarks from the Nigerian margin – Results and interpretation from shallow drilling. Marine and Petroleum Geology, 59, 359-370, https://doi.org/10.1016/j.marpetgeo.2014.09.013

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Abstract:
A joint research expedition between the French IFREMER and the German MARUM was conducted in 2011 using the R/V 'Pourquoi pas?' to study gas hydrate distributions in a pockmark field (1141-1199 m below sea surface) at the continental margin of Nigeria. The seafloor drill rig MeBo of MARUM was used to recover sediments as deep as 56.74 m below seafloor. The presence of gas hydrates in specific core sections was deduced from temperature anomalies recorded during continuous records of infrared thermal scanning and anomalies in pore water chloride concentrations. In situ sediment temperature measurements showed elevated geothermal gradients of up to 258 °C/km in the center of the so-called pockmark A which is up to 4.6 times higher than that in the background sediment (72 °C/km). The gas hydrate distribution and thermal regime in the pockmark are largely controlled by the intensity, periodicity and direction of fluid flow. The joint interaction between fluid flow, gas hydrate formation and dissolution, and the thermal regime governs pockmark formation and evolution on the Nigerian continental margin.
Coverage:
Median Latitude: 3.245619 * Median Longitude: 6.700104 * South-bound Latitude: 3.229500 * West-bound Longitude: 6.696630 * North-bound Latitude: 3.251780 * East-bound Longitude: 6.707030
Date/Time Start: 2011-11-12T11:47:29 * Date/Time End: 2011-12-07T03:16:14
Size:
13 datasets

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Datasets listed in this publication series

  1. Wei, J; Pape, T; Sultan, N et al. (2015): (Table 1) Upper and lower boundaries of the gas hydrate occurrence zone (GHOZ) from MeBo cores during the GUINECO cruise. https://doi.org/10.1594/PANGAEA.845256
  2. Wei, J; Pape, T; Sultan, N et al. (2015): (Table 2) In situ sediment temperature measurements in pockmark A with temperatures probes during the Guineco-MeBo cruise. https://doi.org/10.1594/PANGAEA.845397
  3. Wei, J; Pape, T; Sultan, N et al. (2015): In situ sediment temperature measurements at ten stations in pockmark A from the Guineco-MeBo cruise. https://doi.org/10.1594/PANGAEA.845400
  4. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB01. https://doi.org/10.1594/PANGAEA.845095
  5. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB03. https://doi.org/10.1594/PANGAEA.845102
  6. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB04. https://doi.org/10.1594/PANGAEA.845103
  7. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB05. https://doi.org/10.1594/PANGAEA.845104
  8. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB06. https://doi.org/10.1594/PANGAEA.845105
  9. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB07. https://doi.org/10.1594/PANGAEA.845106
  10. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB08. https://doi.org/10.1594/PANGAEA.845107
  11. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB09. https://doi.org/10.1594/PANGAEA.845108
  12. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB11. https://doi.org/10.1594/PANGAEA.845100
  13. Wei, J; Pape, T; Sultan, N et al. (2015): Pore water chloride concentrations of sediment core GMMB12. https://doi.org/10.1594/PANGAEA.845101