Determination of Uranium, Thorium, and Ionium in sediment cores of the Caribbean and Ionian Sea
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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1978
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| _version_ | 1867169495718559744 |
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| author | Mangini, Augusto Dominik, Janusz |
| author_facet | Mangini, Augusto Dominik, Janusz |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A rapid procedure for Io (Th230) dating of sediments with accumulation rates in the range of several cm/1000 years is described. Studying of large sample populations with very small Io-excess activity is possible as the counting time (around 1500 min/sample) are 2 to 5 times shorter than with the standard Io-excess method. Improved sensitivity of the Io-excess measurement is achieved by: 1) extraction ( ~90 %) of the authigenic Io-excess with EDTA, with minor leaching ( ~30 %) of the allogenic Th232 and Io-supported, 2) processing samples as large as 10 g or more. The procedure was applied to sediments from the Caribbean (V 12-122) and from the Ionian Sea (M22_48 and M17_17). In the case of the standard core V 12-122 our results are in good agreement with previous time-consuming Io determinations. The resulting average accumulation rates of 2.0 ± 0.3 cm/1000 years for the Ionian Sea cores are close to the average derived from magnetic reversal studies of a nearby core. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_548463 |
| institution | PANGAEA |
| language | en |
| publishDate | 1978 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Determination of Uranium, Thorium, and Ionium in sediment cores of the Caribbean and Ionian Sea Mangini, Augusto Dominik, Janusz 17M17; 22M48; BC; Box corer; CIM (Cooperative Investigations of the Mediterranean); Ionian Sea; M17; M17_17; M22; M22_48; Meteor (1964); PC; Piston corer; V12; V12-122; Vema A rapid procedure for Io (Th230) dating of sediments with accumulation rates in the range of several cm/1000 years is described. Studying of large sample populations with very small Io-excess activity is possible as the counting time (around 1500 min/sample) are 2 to 5 times shorter than with the standard Io-excess method. Improved sensitivity of the Io-excess measurement is achieved by: 1) extraction ( ~90 %) of the authigenic Io-excess with EDTA, with minor leaching ( ~30 %) of the allogenic Th232 and Io-supported, 2) processing samples as large as 10 g or more. The procedure was applied to sediments from the Caribbean (V 12-122) and from the Ionian Sea (M22_48 and M17_17). In the case of the standard core V 12-122 our results are in good agreement with previous time-consuming Io determinations. The resulting average accumulation rates of 2.0 ± 0.3 cm/1000 years for the Ionian Sea cores are close to the average derived from magnetic reversal studies of a nearby core. |
| title | Determination of Uranium, Thorium, and Ionium in sediment cores of the Caribbean and Ionian Sea |
| topic | 17M17; 22M48; BC; Box corer; CIM (Cooperative Investigations of the Mediterranean); Ionian Sea; M17; M17_17; M22; M22_48; Meteor (1964); PC; Piston corer; V12; V12-122; Vema |
| url | https://doi.org/10.1594/PANGAEA.548463 |