Preprints
https://doi.org/10.5194/egusphere-2024-992
https://doi.org/10.5194/egusphere-2024-992
18 Apr 2024
 | 18 Apr 2024
Status: this preprint is open for discussion.

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

Status: open (until 30 May 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-992', Xiao-Dong Deng, 12 May 2024 reply
  • RC2: 'Comment on egusphere-2024-992', Florian Hofmann, 15 May 2024 reply
Olga Valentinovna Yakubovich, Natalia Pavlovna Konstantinova, Maria Olegovna Anosova, Mary Markovna Podolskaya, and Elena Valerevna Adamskaya
Olga Valentinovna Yakubovich, Natalia Pavlovna Konstantinova, Maria Olegovna Anosova, Mary Markovna Podolskaya, and Elena Valerevna Adamskaya

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Short summary
Goethite is one of the most common Fe- (oxy)hydroxide minerals which is formed during hydrolyzation of the rocks, implying it is a desired mineral for dating various surface and subsurface geological processes. Nowadays (U-Th)/He dating of goethite is widely used in geochronological studies. Here, on the example of goethite from the Chukchi Borderland, we introduce a new simple methodological approach for accurate (U-Th)/He dating of goethite.