Geochemical investigations to explain iodine-overabundances in Antarctic meteorites

Details Geochemical investigations to explain iodine-overabundances in Antarctic meteorites Geochemical investigations to explain iodine-overabundances in Antarctic meteorites

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2541h&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Sept. 1987, p. 2541-2547. DFG-supported research.

Computer Science

6

Abundance, Antarctic Regions, Geochemistry, Iodine, Meteoritic Composition, Mass Spectroscopy, Petrology, Meteorites, Antarctic Meteorites, Geochemistry, Iodine, Alh Meteorites, Abundance, Bromine, Chlorine, Concentations, Enrichment, Halogens, Samples, Meteorite, Eucrites, Mass Spectrometry, Laboratory Studies, Pca Meteorites, Eet Meteorites, Fro Meteorites, Mbr Meteorites, Procedure, Comparisons

Scientific paper

Iodine, bromine, and chlorine concentrations were determined in different Antarctic meteorite specimens (eucrites, high-iron and low-iron chondrites) with isotope dilution mass spectrometry. In all Antarctic meteorites I-overabundances have been analysed compared with the concentrations for non-Antarctic meteorites of the same class. By analysing different types of Antarctic rocks, a significant decrease of the I concentration - but not of the Br and Cl concentration - was determined from the surfaces to the centers of the rocks. This shows that atmospheric I compounds interact with the surfaces of Antarctic rocks and, therefore, with those of Antarctic meteorites as well. The authors construct a preliminary hypothesis for a geochemical I cycle in Antarctica, taking into consideration long-distance and short-distance transportation of different I compounds from the coast to inland Antarctica.

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