Lunar surface exposure models for meteorites Elephant Moraine 96008 and Dar al Gani 262 from the Moon

Details Lunar surface exposure models for meteorites Elephant Moraine 96008 and Dar al Gani 262 from the Moon Lunar surface exposure models for meteorites Elephant Moraine 96008 and Dar al Gani 262 from the Moon

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35.1177e&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 6, pp. 1177-1181 (2000).

Physics

5

Scientific paper

We derived the cosmic-ray and solar particle exposure history for the two lunar meteorites Elephant Moraine (EET) 96008 and Dar al Gani (DAG) 262 based on the noble gas isotopic abundances including the radionuclide 81Kr. For EET96008 we propose a model for the exposure to cosmic rays and solar particles in three stages on the Moon: an early stage about 500Ma ago, lasting less than 9Ma at a shallow shielding depth of (20g/cm2, followed by a stage when the material was buried without exposure until it was exposed in a recent stage. This recent stage at a shielding depth in a range of 200-600g/cm2 lasted for about 26Ma until ejection. This model is essentially the same as that previously found for lunar meteorite EET87521; thus, pairing of the two EET lunar meteorites that were recovered on the same icefield in Antarctica is confirmed by our data. The cosmic-ray produced isotopes, the trapped solar and lunar atmospheric noble gases, as well as the radionuclide 81Kr observed for the DAG262 lunar meteorite are consistent with a one-stage lunar exposure history. The average burial depth of the DAG material before ejection was within a range of 50-80g/cm2. The exposure to cosmic rays at this depth lasted 500-1000Ma. This long residence time for DAG at relatively shallow depth explains the high concentrations of implanted solar noble gases.

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