Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91..129k&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Physics
Allende Meteorite, Argon Isotopes, Cosmology, Laser Microscopy, Meteoritic Composition, Calcium, Cosmic Rays, Grain Boundaries, Mineralogy, Potassium, Spallation
Scientific paper
New techniques are presented for using a laser microprobe to determine the spallation argon systematics of calcium-aluminum inclusions. The Ar-38(s) amounts determined for melilite and anorthite in a coarse-grained inclusion from Allende are 2.9 x 10 to the -8th and 1.3 x 10 to the -8th cc/g, respectively. The ratio of the amounts is consistent with the calcium contents of these two minerals. The Ar-38(s) amount determined for a fine-grained inclusion from Allende is 1.1 x 10 to the -8th cc/g. Calcium and potassium amounts were determined from irradiated samples of the same inclusions so that production of Ar-38 from calcium during the cosmic ray exposure of Allende could be determined for these samples. The production observed was 12.4 + or - 2.1 x 10 to the -8th cc STP Ar-38/g Ca for the coarse-grained inclusion and 9.9 + or - 2.4 cc STP Ar-38/g Ca for the fine-grained inclusion. No evidence of unusual exposure was observed in the two inclusions studied.
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