Weathering geochronology by u thhe dating of goethite

These data demonstrate that internally consistent He ages can be obtained on goethite, but do not prove quantitative 4He retention.To assess possible diffusive He loss, stepped-heating experiments were performed on two goethite samples that were subjected to proton irradiation to produce a homogeneous distribution of spallogenic 3He.This degree of retentivity is in excellent agreement with that independently predicted from the helium diffusion coefficients extrapolated to Earth surface temperature and held for the appropriate duration.

By using our site, you agree to our collection of information through the use of cookies. Nine samples of supergene goethite (Fe OOH) from Brazil and Australia were selected to test the suitability of this mineral for (U-Th)/He dating. I.; Combes, M.; Bellucci, G.; Bibring, J.-Pierre; Capaccioni, F.; Cerroni, P.; Coradini, A.; Formisano, V.; Filacchi, 2009: Wiseman, S. F.; Angrilli, F.; Barbieri, C.; Barucci, A.; Cremonese, G.; D. C.cco, M.; Fornasier, S.; Fulle,; M.; Groussin, O.; Gutierrez, P.; Hviid, S. To learn more or modify/prevent the use of cookies, see our Cookie Policy and Privacy Policy. T.pani, 2009: Petrology of the non-mineralized Wheeler River sandstone-hosted alteration system and the Eagle Point and Millennium basement-hosted unconformity-related uranium deposits, Athabasca Basin,; Saskatchewan; implications for uranium Nurlybayev, A.

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Thus while diffusive-loss corrections to supergene goethite He ages are required, these initial results indicate that the corrections are not extremely large and can be rigorously quantified using the proton-irradiation 4He/ 3He method.

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