Thorium and Uranium analyses of sediment core GIK12310-4, NW African continental margin (Table 1,2)
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1978
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| _version_ | 1867169803886657536 |
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| author | Mangini, Augusto |
| author_facet | Mangini, Augusto |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Th content of the sediment samples from "Meteor" core GIK12310-4 (3080 m water depth, off NW Africa) on a carbonate-free basis lies around the average of 12.4 ppm and is similar to the average content of the earth crust. On the contrary, uranium was found to be up to 3.5-fold enriched in the core section between 60 and 330 cm (within the Wuerm Glacial) where reducing conditions occur, due to deposition of authigenic uranium (9 µg/cm**2 1000 yrs.). The authigenic uranium content is correlated to the organic matter content (U/Corg ratio = 6 * 10**4). On the basis of the uranium content of the oxidized section uranium was split into a detritic and an authigenic component and the amount of supported ionium was calculated. From the profile of the specific Io-cxcess activity (= Io-total - Io-supported) with depth, average sedimentation rates of 3.3 ± 0.6 cm/1000 yrs. for the warmer stages and of 5 ± 1 cm/l000 yrs. for the cooler periods were estimated. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_527933 |
| institution | PANGAEA |
| language | en |
| publishDate | 1978 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Thorium and Uranium analyses of sediment core GIK12310-4, NW African continental margin (Table 1,2) Mangini, Augusto Calcium carbonate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; East Atlantic; GIK12310-4; KAL; Kasten corer; M25; Meteor (1964); Protactinium, standard deviation; Protactinium-231; Protactinium-231 excess; Protactinium-231 excess, standard deviation; Thorium; Thorium, standard deviation; Thorium-230; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation The Th content of the sediment samples from "Meteor" core GIK12310-4 (3080 m water depth, off NW Africa) on a carbonate-free basis lies around the average of 12.4 ppm and is similar to the average content of the earth crust. On the contrary, uranium was found to be up to 3.5-fold enriched in the core section between 60 and 330 cm (within the Wuerm Glacial) where reducing conditions occur, due to deposition of authigenic uranium (9 µg/cm**2 1000 yrs.). The authigenic uranium content is correlated to the organic matter content (U/Corg ratio = 6 * 10**4). On the basis of the uranium content of the oxidized section uranium was split into a detritic and an authigenic component and the amount of supported ionium was calculated. From the profile of the specific Io-cxcess activity (= Io-total - Io-supported) with depth, average sedimentation rates of 3.3 ± 0.6 cm/1000 yrs. for the warmer stages and of 5 ± 1 cm/l000 yrs. for the cooler periods were estimated. |
| title | Thorium and Uranium analyses of sediment core GIK12310-4, NW African continental margin (Table 1,2) |
| topic | Calcium carbonate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; East Atlantic; GIK12310-4; KAL; Kasten corer; M25; Meteor (1964); Protactinium, standard deviation; Protactinium-231; Protactinium-231 excess; Protactinium-231 excess, standard deviation; Thorium; Thorium, standard deviation; Thorium-230; Thorium-230 excess; Thorium-230 excess, standard deviation; Uranium; Uranium, standard deviation; Uranium-234/Uranium-238 activity ratio; Uranium-234/Uranium-238 activity ratio, standard deviation |
| url | https://doi.org/10.1594/PANGAEA.527933 |