Determination of Uranium, Thorium, and Ionium in sediment cores of the Caribbean and Ionian Sea
| Cobertura |
MEDIAN LATITUDE: 31.000000 * MEDIAN LONGITUDE: -12.800000 * SOUTH-BOUND LATITUDE: 17.000000 * WEST-BOUND LONGITUDE: -74.400000 * NORTH-BOUND LATITUDE: 38.000000 * EAST-BOUND LONGITUDE: 18.000000 * DATE/TIME START: 1957-07-29T00:00:00 * DATE/TIME END: 1957-07-29T00:00:00 |
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| Data(s) |
15/11/1978
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| Resumo |
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. |
| Formato |
application/zip, 3 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.548463 doi:10.1594/PANGAEA.548463 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Mangini, Augusto; Dominik, Janusz (1978): Th230-excess EDTA extraction: A modification of the ionium method for high accumulation rate determinations. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C29, 6-13 |
| Palavras-Chave | #17M17; 22M48; 230Th; 230Th std dev; 232Th; 232Th std dev; 238U; 238U std dev; BC; Box corer; Bulk-material; Bulk-material, dpm/g; Bulk-material, Ionium; Bulk-material, ppm; CaCO3; Calcium carbonate; CIM (Cooperative Investigations of the Mediterranean); Comm 2; Comment; Comment 2 (continued); Depth; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth bot; Depth top; Description; EDTA extracted; EDTA extracted, Ionium; Extraction with EDTA/Calcium carbonate ratio; Ionian Sea; M17; M17_17; M22; M22_48; Meteor (1964); PC; Piston corer; Thorium 230; Thorium 230, standard deviation; Thorium 232; Thorium 232, standard deviation; Uranium 238; Uranium 238, standard deviation; V12; V12-122; Vema |
| Tipo |
Dataset |
