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The meteorite flux of the past 2 m.y. recorded in the atacama desert

Abstract : The evolution of the meteorite flux to Earth can be studied by determining the terrestrial ages of meteorites collected in hot deserts. We measured the terrestrial ages of 54 stony meteorites from the El Medano area, in the Atacama Desert, Chile, using the cosmogenic nuclide Cl-36. With an average age of 710 ka, this collection is the oldest collection of nonfossil meteorites at Earth's surface. This allows both determination of the average meteorite flux intensity over the past 2 m.y. (222 meteorites larger than 10 g per km(2) per m.y.) and discussion of its possible compositional variability over the Quaternary Period. A change in the flux composition, with more abundant H chondrites, occurred between 1 and 0.5 Ma, possibly due to the direct delivery to Earth of a meteoroid swarm from the asteroid belt.
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https://hal.inrae.fr/hal-02627708
Déposant : Migration Prodinra <>
Soumis le : mardi 26 mai 2020 - 21:07:48
Dernière modification le : mardi 10 novembre 2020 - 15:46:14

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A. Drouard, J. Gattacceca, A. Hutzler, P. Rochette, R. Braucher, et al.. The meteorite flux of the past 2 m.y. recorded in the atacama desert. Geology, Geological Society of America, 2019, 47 (7), pp.673-676. ⟨10.1130/G45831.1⟩. ⟨hal-02627708⟩

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