Iodine overabundances measured in the surface layers of an Antarctic stony and iron meteorite

Details Iodine overabundances measured in the surface layers of an Antarctic stony and iron meteorite Iodine overabundances measured in the surface layers of an Antarctic stony and iron meteorite

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2503h&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Sept. 1990, p. 2503-2506. Research supported by DFG.

Computer Science

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Antarctic Regions, Chondrites, Iodine, Iron Meteorites, Meteoritic Composition, Stony Meteorites, Surface Layers, Bromine, Chlorine, Electron Capture, Gas Chromatography, Iodides, Isotopes, Mass Spectroscopy, Methyl Compounds

Scientific paper

Following reports of an iodine overabundance in Antarctic meteorites, the surface layer and an interior sample (at the depth of about 5 cm) of a large Antarctic H5 chondrite and an IIIA iron meteorite, were analyzed for iodine, bromine, and chlorine, using isotope dilution mass spectrometry. Also analyzed were the evaporites of the H5 meteorite and the surface layer of two different cracks in the IIIA meteorite. Results revealed significant iodine overabundance in the surface layer and in the evaporites of the chondrite specimen and an even higher enrichment in the corroded surface layers of the two cracks of the IIIA meteorite. Results of analyses of the marine atmosphere and sea water near Antarctica showed an average CH3I concentrations of 2.4 pptv and 2.6 ng/l, respectively, indicating that the source of the iodine contamination in Antarctic meteorites and rocks is methyl iodide of the Antarctic atmosphere, derived from polar sea.

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