|
|||||
|
|
Annama H chondrite—Mineralogy,physical properties,cosmic ray exposure,and parent body history |
|
| Authors: | Tomáš Kohout Jakub Haloda Patricie Halodová Matthias M. M. Meier Colin Maden Henner Busemann Matthias Laubenstein Marc. W. Caffee Kees C. Welten Jens Hopp Mario Trieloff Ramakant R. Mahajan Sekhar Naik Josep M. Trigo‐Rodriguez Carles E. Moyano‐Cambero Michael I. Oshtrakh Alevtina A. Maksimova Andrey V. Chukin Vladimir A. Semionkin Maksim S. Karabanalov Israel Felner Evgeniya V. Petrova Evgeniia V. Brusnitsyna Victor I. Grokhovsky Grigoriy A. Yakovlev Maria Gritsevich Esko Lyytinen Jarmo Moilanen Nikolai A. Kruglikov Aleksey V. Ishchenko |
| Affiliation: | 1. Department of Physics, University of Helsinki, Finland;2. Institute of Geology, The Czech Academy of Sciences, Praha, Czech Republic;3. Finnish Fireball Network, Finland;4. Czech Geological Survey, Prague, Czech Republic;5. Institute of Geochemistry and Petrology, ETH Zurich, Zurich, Switzerland;6. Laboratori Nazionali del Gran Sasso, Istituto Nazionale di Fisica Nucleare, Assergi (AQ), Italy;7. Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana, USA;8. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Indiana, USA;9. Space Sciences Laboratory, University of California, Berkeley, California, USA;10. Institut für Geowissenschaften, Universit?t Heidelberg, Heidelberg, Germany;11. Klaus‐Tschira‐Labor für Kosmochemie, Heidelberg, Germany;12. Physical Research Laboratory, Ahmedabad, India;13. Institute of Space Sciences (CSIC‐IEEC), Meteorites, Minor Bodies and Planetary Sciences Group, Campus UAB Bellaterra, Cerdanyola del Vallès, Barcelona, Spain;14. Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russia;15. Institute of Material Science and Metallurgy, Ural Federal University, Ekaterinburg, Russia;16. Racah Institute of Physics, The Hebrew University, Jerusalem, Israel;17. Dorodnicyn Computing Centre, Federal Research Center Computer Science and Control of the Russian Academy of Sciences, Moscow, Russia;18. Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, Russia |
| Abstract: | The fall of the Annama meteorite occurred early morning (local time) on April 19, 2014 on the Kola Peninsula (Russia). Based on mineralogy and physical properties, Annama is a typical H chondrite. It has a high Ar‐Ar age of 4.4 Ga. Its cosmic ray exposure history is atypical as it is not part of the large group of H chondrites with a prominent 7–8 Ma peak in the exposure age histograms. Instead, its exposure age is within uncertainty of a smaller peak at 30 ± 4 Ma. The results from short‐lived radionuclides are compatible with an atmospheric pre‐entry radius of 30–40 cm. However, based on noble gas and cosmogenic radionuclide data, Annama must have been part of a larger body (radius >65 cm) for a large part of its cosmic ray exposure history. The 10Be concentration indicates a recent (3–5 Ma) breakup which may be responsible for the Annama parent body size reduction to 30–35 cm pre‐entry radius. |
| Keywords: | |