Sediment and geochemistry of bi-gradational contourite sequences from the Gulf of Cadiz
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2024
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| _version_ | 1867168574920982528 |
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| author | Stow, Dorrik A V Smillie, Zeinab Wilkin, Jonathan Pan, Jiawei Esegbue, Onoriode Bahr, André Ducassou, Emmanuelle |
| author_facet | Stow, Dorrik A V Smillie, Zeinab Wilkin, Jonathan Pan, Jiawei Esegbue, Onoriode Bahr, André Ducassou, Emmanuelle |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The contourite depositional systems at the Gulf of Cadiz during IODP 339 are characterised by the repetition of bi-gradational sequences. These sequences are of an average thickness of 3 m (typical range 0.5-7.5 m) each. The nature of these sequences and the forces that derive such sedimentation patterns are not well understood. The data provided covers two complete bi-gradational sequences from Site U1389. Grain Size fractions from both bulk and carbonate-free analyses are given as well as various grain size parameters are used to decipher the current energy and depositional process. A new approach was used here to assess each size fraction's behaviour separately and to used combined sortable silt and fine sand fractions (SSS - sortable silt and sand proxy) to calculate the current speed. In conclusion, aspects of the contourite sequences here justify the dual effects of long-term variation in bottom-current velocity and episodic changes in sediment supply (both lithogenic and biogenic). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_937307 |
| institution | PANGAEA |
| language | en |
| publishDate | 2024 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sediment and geochemistry of bi-gradational contourite sequences from the Gulf of Cadiz Stow, Dorrik A V Smillie, Zeinab Wilkin, Jonathan Pan, Jiawei Esegbue, Onoriode Bahr, André Ducassou, Emmanuelle contourite; Contourites; grain size analysis; IODP 339; isotope analysis; U1389A The contourite depositional systems at the Gulf of Cadiz during IODP 339 are characterised by the repetition of bi-gradational sequences. These sequences are of an average thickness of 3 m (typical range 0.5-7.5 m) each. The nature of these sequences and the forces that derive such sedimentation patterns are not well understood. The data provided covers two complete bi-gradational sequences from Site U1389. Grain Size fractions from both bulk and carbonate-free analyses are given as well as various grain size parameters are used to decipher the current energy and depositional process. A new approach was used here to assess each size fraction's behaviour separately and to used combined sortable silt and fine sand fractions (SSS - sortable silt and sand proxy) to calculate the current speed. In conclusion, aspects of the contourite sequences here justify the dual effects of long-term variation in bottom-current velocity and episodic changes in sediment supply (both lithogenic and biogenic). |
| title | Sediment and geochemistry of bi-gradational contourite sequences from the Gulf of Cadiz |
| topic | contourite; Contourites; grain size analysis; IODP 339; isotope analysis; U1389A |
| url | https://doi.org/10.1594/PANGAEA.937307 |