Abstract The gas content of individual bubbles in tektites and other natural glasses was investigated using a highly sensitive gas chromatograph. In indochinites, moldavites and dense No¨rdlinger Ries glass, the nitrogen/oxygen ratios were found to be roughly similar to the ratio in terrestrial atmosphere. Bubbles in Muong Nong and Muong Nong-type glass of East Thailand contain air as well as nitrogen and carbon dioxide. In bubbles of Libyan desert glass nitrogen and carbon dioxide were found but no oxygen could be detected. In none of the analyzed bubbles carbon monoxide or other gases were present in measurable quantities. Rare gases were not determined.

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