Volatile non-metallic elements in tektites

Fluorine and boron geochemistry of tektites, impact glasses, and target rocks

“…The F contents reported here are similar to the data given by Koeberl et al (1983, I 984a) who report a range of 21-46 ppm for Australasian tektites, and Moore et al (1984) who find a range of 12-40 ppm for tektites from three strewn fields (their lowest value of 12 ppm for a bediasite is in good agreement with our data). The higher abundances in Muong Nong type tektites are in agreement with earlier data by Koeberl et al (I 984b) and Koeberl and Beran (1988), who report a range of 56-127 ppm for 19 samples, and similar to the 230 ppm reported by Moore et al (1984) for one sample. The present data for F (and B) in MN8302 is somewhat higher than the values given by Koeberl et al (1984b), which might be due to sample inhomogeneity.…”

“…This is mostly because of the rather extensive and time-consuming analyses that have to be performed, as these elements often have low abundances in geological materials and are usually difficult to determine with common (instrumental) multi-element methods (such as neutron activation analysis or XRF). The first determinations of fluorine contents of tektites and impact glasses were reported by Koeberl et al (1983Koeberl et al ( , 1984a and Moore et al (1984);these authors noted that the F abundances in these glasses are dissimilar to those of any volcanic glasses, and lower than *To whom correspondence should be addressed.…”

Fluorine and Chlorine Contents of Tektites

“…The CI analyses confirm the relatively high concentrations in the Muong Nong-type tektites and the marked depletion in normal tektites already reported by Becker and Manuel (1972), Muller and Gentner (1973) and Moore et al (1984). These authors reported 1-15 ppm CI in normal tektites whereas the values given here range from 3-44 ppm.…”

“…Normal tektites from Australia and the Ivory Coast tend to have relatively low contents but this may only reflect the limited number of specimens analysed. Distinctly lower F contents (12-67 ppm) in tektites were reported by Koeberl et al (1984) and Moore et al (1984), but the absence of analyses on international reference materials prevents any discussion of the analytical discrepancy.…”

“…Small amounts of gaseous HF are sometimes present in tektite inclusions (Dolgov et al, 1969;Heide and Schmidt, 1978). F analysis of tektites were previously reported by Koeberl et al (1984) and Moore et al (1984).…”