In-situ sediment temperature and pore water chloride concentration at pockmarks of the Nigerian continental margin
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2015
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| author | 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 |
| author_facet | 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 |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_845401 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | In-situ sediment temperature and pore water chloride concentration at pockmarks of the Nigerian continental margin 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 Center for Marine Environmental Sciences; MARUM 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. |
| title | In-situ sediment temperature and pore water chloride concentration at pockmarks of the Nigerian continental margin |
| topic | Center for Marine Environmental Sciences; MARUM |
| url | https://doi.org/10.1594/PANGAEA.845401 |