Mathematics – Logic
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..397m&link_type=abstract
Meteoritics, vol. 28, no. 3, volume 28, page 397
Mathematics
Logic
1
Halogens, Moldavites, Tektites, Trace Elements
Scientific paper
The Lusatian subfield within the moldavite strewnfield was proposed by [1], based on petrographical criteria. During the course of this study we analyzed 18 moldavites for their major- and trace-element composition (2 from the Radomilice, 2 from the Bohemian, 4 from the Moravian, and 10 from the Lusatian subfield). It was one aim of this study to elucidate geochemical relations of the Lusatian tektites in respect to tektites from the other subfields. Including data from [2], tektites from the Moravian and Bohemian subfield are quite distinct on the basis of their major-element composition. The variation of the elements can be explained by varying mixtures of clay and dolomite components besides quartz. Moravian tektites are dominated by a clay component and the Bohemian by a dolomite component respectively. Lusatian glasses are intermediate in their major- and trace-element abundances and in petrographical features as well. A mixing of glasses from the Bohemian and Moravian subfield by ground transportation can be excluded, because fluviatile transportation of Lusatian tektites was short [1]. In six moldavites the halogen abundances (F, Cl, Br, and I) were analyzed. The average abundance is lower in comparison to most of the other tektite strewnfields. The MN-7 tektite reported by [3] and reanalyzed in this work has halogen abundances 5X average, but shows no unusual content of other trace elements. One moldavite (JKV 12) shows halogen contents 30X to 50X higher than average. The Cl and Br abundances are similar to Muong Nong-type tektites from the Australasian strewnfield [4], and JKV 12 also exhibits very unusual major- and trace-element composition. According to its composition, JKV 12 belongs to the Muong Nong-type tektites and is one of the few known Muong Nong-type moldavites [3-7]. Optical and microchemical inhomogeneity in the micrometer scale within JKV 12 can be explained by the formation of two distinct type of microtektites, like the Muong Nong-type moldavite 2205 from Lhenice [7]. One phase shows a pronounced Moravian signature and the other a Bohemian respectively. We suggest that all Muong Nong-type tektites from the moldavite strewnfield are composed of two distinct glass phases besides lechatelierite. References: [1] Storr M. and Lange J.-M. (1992) GCA, 56, 2937- 2940. [2] Lange J.-M. (1993) Ph.D. thesis, in preparation. [3] Meisel T. et al. (1989) Meteoritics, 24, 303. [4] Meisel T. et al. (1992) Meteoritics, 27, 576-579. [5] Rost R. (1966) Acta Univ. Carolinae-Geologica, 4, 235-242. [6] Glass B. P. et al. (1989) LPS XX, 341-342. [7] Fehr K. T. and Preuss E. (1990) Ber. DMG, Beih. Eur. J. Min., 2, 56. Fig. 1, which appears here in the hard copy, shows analyses of moldavites by [2] in a plot of oxide weight percent ratios after [8]. There is a clear separation of the Bohemian and Moravian subfields, whereas the Lusatian samples plot in both fields.
Fehr Karl Thomas
Lange Michael J.
Langenauer Marcel
Meisel Th.
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