Terrestrial ages of seven meteorite strewn fields and two single unpaired meteorites from the Sultanate of Oman determined using 14C and 10Be

1,2Malgorzata U. Sliz,2,3Beda A. Hofmann,1Ingo Leya,4Sönke Szidat,5Christophe Espic,5Jérôme Gattacceca,5Régis Braucher,5Daniel Borschneck,6Edwin Gnos,5ASTER Team
Meteoritics & Planetary Science (in Press) Open Access Link to Article [https://doi.org/10.1111/maps.13922]
1Space Research and Planetary Sciences, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
2Natural History Museum Bern, Bernastrasse 15, 3005 Bern, Switzerland
3Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3005 Bern, Switzerland
4Department of Chemistry and Biochemistry & Oeschger Center for Climate Change Research, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
5CNRS, Aix Marseille Univ, IRD, INRAE, CEREGE, Aix-en-Provence, France
6Natural History Museum of Geneva, Route de Malagnou 1, 1208 Geneva, Switzerland
Published by arrangement with John Wiley & Sons

Through the investigation of terrestrial ages of meteorites from Oman, we aim to better understand the time scales of meteorite accumulation and erosion in Oman and the meteorite flux in the past. Here, we present 14C and 14C-10Be terrestrial ages of seven ordinary chondrite strewn fields and two unpaired single meteorites from the Sultanate of Oman. After critical evaluation of multiple data for each strewn field, we propose “best estimate terrestrial ages,” typically based on 14C/10Be. For objects for which complex irradiation histories are known or suspected, terrestrial ages were calculated solely using 14C. The best estimate strewn field ages range from 8.1 ± 3.0 ka (SaU 001) to 35.2 ± 5.1 ka (Dho 005). Including two previously dated strewn fields, the mean and median age of nine Oman strewn fields is 15.9 ± 12.3 and 13.6 ka, respectively. The new data show a general good agreement with data previously obtained in a different laboratory, and we observe a similar general correlation between strewn field ages and mean weathering grade as in previous work based on individual meteorites. Weathering degree W4 is reached for dated samples after 20–35 ka. While the age statistics of strewn fields does not show the previously observed lack of young events, the low abundance of young (0–5 ka) individual meteorites as compared with older (~20 ka) meteorites is confirmed by our data and remains unexplained.


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