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Determination of bromine in stony meteorites by neutron activation

1967; American Geophysical Union; Volume: 72; Issue: 24 Linguagem: Inglês

10.1029/jz072i024p06279

2156-2202

K.W. Lieberman, W. D. Ehmann,

High-pressure geophysics and materials

Eighteen chondrites and seven achondrites have been analyzed for bromine by thermal neutron activation. Fourteen of the specimens were analyzed in replicate. Bromine is found to be fractionated among the three types of chondrites: carbonaceous 3.04, enstatite 1.64, and ordinary 0.34 ppm Br. This trend is similar to the depletion pattern found by other investigators for iodine. Bromine is found to have a higher abundance in the type I carbonaceous chondrites (atomic abundance of 18.6 relative to Si = 106 atoms) than has been predicted by, calculations based on theories of nucleosynthesis. Bromine is not depleted in the howardite-eucrite grouping of achondrites with respect to the ordinary chondrites, in spite of the depletion of alkali elements with which bromine is often associated in natural materials.