Abstract

Tektitelike glass objects called irghizites have been found associated with the Zhamanshin impact crater in southern Siberia. The irghizites are similar to the Australasian tektites in composition, and the Zhamanshin crater appears to be about the same age as the Australasian tektites. Variations in size, structure, form, petrography, and chemical composition of tektites within the Australasian strewnfield suggest that the source of the Australasian tektites lies to the northwest, in the direction of the Zhamanshin crater. It is hypothesized that both the irghizites and the Australasian tektites may have been produced by impact melting of loesslike deposits that covered the area at the Zhamanshin crater site prior to the impact.

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