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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053

Abstract

VIVONE, Ronaldo J.; GODOY, Maria Luiza D. P.; GODOY, José Marcus  and  SANTOS, Guaciara M.. Method development for 234U and 230Th determination and application to fossil deep-water coral and authigenic carbonate dating from the Campos Basin - Brazil. J. Braz. Chem. Soc. [online]. 2012, vol.23, n.3, pp.538-545. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532012000300022.

A 234U and 230Th determination method based on an extraction chromatographic separation followed by ICP-MS with quadrupole (ICP-QMS) was developed. For authigenic carbonates, a second separation step with ion exchange chromatography in a HNO3 solution was added. These methods were applied to seven fossil deep-water coral and two authigenic carbonate samples from the continental slope of the Campos Basin - Brazil. The ages determined for the fossil corals samples from the same sediment core ranged from 9 to 202 ky with a 1% uncertainty, consistent with the values determined by 14C dating and with those determined by 230Th/234U using flow injection coupled to an ICP-QMS. One of the authigenic carbonates analyzed presented an age of approximately 80 ky. The other sample exhibited a 230Th/234U activity ratio close to equilibrium and out of the application range of the method.

Keywords : 230Th/234U dating; ICP-MS; fossil deep-water corals; authigenic carbonates.

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