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Preprints
https://doi.org/10.5194/egusphere-2024-992
https://doi.org/10.5194/egusphere-2024-992
18 Apr 2024
 | 18 Apr 2024

Short communication: New analytical approach on (U-Th)/He dating of Fe-hydroxide with an example using goethite from the Amerasian Basin, Arctic Ocean 

Olga Valentinovna Yakubovich, Natalia Pavlovna Konstantinova, Maria Olegovna Anosova, Mary Markovna Podolskaya, and Elena Valerevna Adamskaya

Abstract. We propose a new analytical approach for (U-Th)/He dating of Fe-hydroxides, that includes sealing samples in quartz ampoules and demonstrates its suitability as a reliable tool for the investigation of geological processes. The (U-Th)/He ages of goethite clasts and vein from Fe- and Mn-oxide mineralization rocks recovered from the slope of Chukchi Borderland in the Amerasia Basin demonstrate remarkable reproducibility, yielding a weighted mean age of 8.6 ± 0.3 Ma (n=4) and 4.8 ± 0.4 Ma (n=2), respectively, providing insights into the Neogene mineralization history of the region. This study also focuses on the sample preparation technique, that might influence the (U-Th)/He ages. Our data indicate that a significant fraction of U can be leached from the goethite during sonication by distilled water which might result in over-dispersed (U-Th)/He ages.

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Journal article(s) based on this preprint

17 Dec 2024
Technical note: An analytical approach for (U–Th) ∕ He dating of goethite by sample encapsulation in quartz ampoules under vacuum, with an example from the Amerasian Basin, Arctic Ocean
Olga Valentinovna Yakubovich, Natalia Pavlovna Konstantinova, Maria Olegovna Anosova, Mary Markovna Podolskaya, and Elena Valerevna Adamskaya
Geochronology, 6, 653–664, https://doi.org/10.5194/gchron-6-653-2024,https://doi.org/10.5194/gchron-6-653-2024, 2024
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Short summary
Goethite is one of the most common Fe- (oxy)hydroxide minerals which is formed during...
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