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The meteorite flux of the past 2 m.y. recorded in the Atacama Desert

A. Drouard, J. Gattacceca, A. Hutzler, P. Rochette, R. Braucher, D. Bourles, M. Gounelle, A. Morbidelli, V. Debaille, M. van Ginneken, M. Valenzuela, Y. Quesnel and R. Martinez
The meteorite flux of the past 2 m.y. recorded in the Atacama Desert
Geology (Boulder) (July 2019) 47 (7): 673-676


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 (super 36) Cl. 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 (super 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.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 7
Title: The meteorite flux of the past 2 m.y. recorded in the Atacama Desert
Affiliation: Aix-Marseille Universite, Centre National des Etudes Spatiales, Marseille, France
Affiliation: Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Team
Pages: 673-676
Published: 201907
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 2019-068708
Categories: Petrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019247
Illustration Description: illus. incl. sketch map
Secondary Affiliation: Lunar and Planetary Institute, USA, United StatesMuseum National d'Histoire Naturelle, FRA, FranceUniversite de la Cote d'Azur, FRA, FranceUniversite Libre de Bruxelles, BEL, BelgiumServicio Nacional de Geologia y Mineria, CHL, ChileMuseo del Meteorito, CHL, Chile
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201936
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