Cosmogenic Radionuclides in Meteorites

Details Cosmogenic Radionuclides in Meteorites Cosmogenic Radionuclides in Meteorites

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........23m&link_type=abstract

PhD Dissertation, Purdue Univ. West Lafayette, IN United States

Computer Science

1

Meteorites, Aluminum Isotopes, Beryllium Isotopes, Radioactive Isotopes, Chlorine, Antarctic Regions, Cosmic Rays, Cosmology, Chondrites, Multivariate Statistical Analysis, Temporal Distribution, Trace Elements, Canyons

Scientific paper

The cosmogenic radionuclides Al-26 (t1/2 = 0.71 Myr), Be-10 (t1/2 = 1.5 Myr), and Cl-36 (t1/2 = 0.30 Myr) have been measured in 12 fragments of the Canton Diablo meteorite and in 39 Antarctic meteorites. Canyon Diablo results have experimentally confirmed theoretical calculations that there is a very significant matrix-dependent component to the build-up and development of the secondary flux of cosmic rays in meteorites. Cosmic-ray exposure ages calculated using these results are about 540 Myr in most cases. Terrestrial gas calculated for Antarctic meteorites C1-36 data are usually less than 100 kyr. Multivariate statistical analyses of the labile trace elements in 38 Antarctic finds and 58 non-Antarctic falls, all H chondrites, indicates that meteorites of long (greater than 50 kyr) terrestrial age are the most compositionally distinct from falls. Meanwhile, the Antarctic meteorites most recently captured by the Earth are not distinguishable from the (also recently captured) falls. This is strong evidence that the differences seen between Antarctic and non-Antarctic meteorites are the result of temporal variations in the H chondrite flux to Earth.

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