Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27q.260m&link_type=abstract
Meteoritics, vol. 27, no. 3, volume 27, page 260
Computer Science
Scientific paper
We analyzed a variety of glasses from different localities and some related basement rocks. Our aim was to complete the existing database for F, Cl, Br, and I. For the first time Cl, Br, and I data on Darwin Glass are presented and new values for I are reported on Muong Nong-type tektites, Bediasites, Ivory Coast tektites, Libyan Desert Glasses, and Zhamanshinites. Also we reevaluated existing analysis cited in the literature to compare them to our values The halogens contents were determined by neutron activation analysis followed by a simultaneous radiochemical separation by pyrohyrolysis (Langenauer et al. 1992). Analytical problems seem to be a major source of error of many literature values. The tektite and impact glasses show similar australite normalization patterns within their groups and distinct patterns among the groups. The Muong Nong tektites show a volatilization behavior of I > Br > Cl > F, which is compatible with the volatilization behavior of the halogens under oxidizing conditions in a melt. Comparing Darwin Glass with the possible basement rock of Darwin crater we conclude that at least two processes are needed to control the abundance of the halogens: First a selective volatilization of F and then a removal of the halogens with I > Br > Cl > F from the melt. For Darwin Glass an incomplete mixing model is included to explain the observed facts satisfyingly. We think that all the tektites and impact glasses show a similar behavior of the halogens. The lack of data on the composition of the source material makes it difficult to prove the validity of this model. References. LANGENAUER M. AND KRAHENBUHL U., FURRER V., AND WYTTENBACH A. (1992) Determination of fluorine, chlorine, bromine, and iodine in seven geochemical reference samples. Geostand. Newslett., 16, 41-44. F Cl Br I Sample (ppm) (ppm) (ppm) (ppm) Bediasite BED 8401 9+-1 6.3+-0.3 0.07+-0.01 0.026+-0.005 Ivory Coast IVC 2069 22+-2 4.2+-0.2 0.55+-0.02 0.013+-0,006 Muong Nong MN 5425-6 117+-5 65+-3 0.65+-0.03 0.54+-0.02 Darwin Glass DG 8706 26+-2 7.2+-0.3 0.22+-0.02 0.031+-0.004 DG mix basement 514+-20 19.6+-1.1 0.54+-0.02 0.079+-0.01 rock Liby Des. Glass LYD 8501 7+-1 7+-1 0.11+-0.02 0.019+-0.005 Zhamanshinite Zh 62/3b 96+-4 27+-1 0.12+-0.03 0.036+-0.009
Krähenbühl Urs
Langenauer Marcel
Meisel Th.
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