Water in Tektites and Impact Glasses by FTIR Spectrometry

Details Water in Tektites and Impact Glasses by FTIR Spectrometry Water in Tektites and Impact Glasses by FTIR Spectrometry

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..211b&link_type=abstract

Meteoritics, vol. 32, pages 211-216

Computer Science

14

Scientific paper

To improve the scarce data base of water content in tektites and impact glasses, we analyzed 26 tektites from all four strewn fields and 25 impact glass samples for their water content. We used the fourier transformed IR (FTIR) spectrometry method, which permits measurement of areas of about 40 mm in diameter. Our results show that the tektites have water contents ranging from 0.002 to 0.030 wt% (average 0.014+/-0.008 wt%). Ivory Coast tektites have the lowest water abundances (0.002-0.003 wt%), and Muong Nong-type indochinites and some North American tektites having the highest contents (up to about 0.03 wt%). Impact glass samples (from the Zhamanshin, Aouelloul, and Rio Cuarto craters) yielded water contents of 0.008 to 0.13 wt% H2O. Typical impact glasses from the Aouelloul and Zhamanshin craters have low water contents (0.008 to 0.063 wt%). Libyan Desert Glasses and Rio Cuarto glasses have higher water contents (about 0.11 wt%). We also analyzed glasses of unknown origin (e.g., urengoites; glass fragments from Tikal), which showed very low water contents, in agreement with an origin by impact. Our data confirm that all tektites found on land have very low water contents (<0.03 wt% water), while impact glasses have slightly higher water contents. Both glass types are very dry compared to volcanic glasses. This study confirms that the low water contents (<0.05 wt%) of such glasses can be considered good evidence for an origin by impact.

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