Exposure history of shergottites

Details Exposure history of shergottites Exposure history of shergottites

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1017n&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Physics

17

Achondrites, Aluminum 26, Chlorine, Meteoritic Composition, Particle Tracks, Radioactive Age Determination, Asteroids, Beryllium 10, Cosmic Rays, Manganese Isotopes, Mars (Planet), Mass Spectroscopy, Neutron Activation Analysis, Radiation Dosage, Meteorites, Stony Meteorites, Achondrites, Shergotty, Samples, Meteorite, Shergottites, Cosmogenic Material, Nuclides, Antarctic Meteorites, Origin, Alh Meteorites, Eet Meteorites, Alha77005, Eeta79001, Spectrometry, Depth, Neutron Activation Analysis, Parent Bodie

Scientific paper

The cosmogenic nuclides Cl-36, Al-26, Be-10, and Mn-53 were analyzed in Shergotty, ALHA 77005, and EETA 79001 shergottites by means of accelerator mass spectrometry and neutron activation. The cosmogenic radionuclide data were combined with noble gas data and cosmic ray track data to obtain the exposure ages, terrestrial ages, preatmospheric radii, and ablation depths for the three shergottites. The results indicate that none of the three meteorites was irradiated measurably by cosmic rays on its parent body, and that all three objects were ejected from greater than a 3-m depth in their parent bodies. The EETA 79001 meteorite was ejected in an event distinct from that of ALHA 77005 and Shergotty. All three shergottites show a very small amount of ablation, suggesting low velocities on entry into the earth's atmosphere.

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