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Tektite origin by hypervelocity asteroidal or cometary impact: Target rocks, source craters, and mechanisms

1992; Geological Society of America; Linguagem: Inglês

10.1130/spe293-p133

2331-219X

Christian Koeberl,

Geological and Geochemical Analysis

Tektites are natural glasses that occur on earth in four distinct strewn fields (North American, Central European, Ivory Coast, and Australasian). Geochemical arguments have shown that tektites have been derived by hypervelocity impact melting from terrestrial upper crustal rocks, most likely sediments. The contents of Be-10 in tektites are evidence for a derivation of tektites from surface rocks, thus precluding an origin from greater depth in the crater. For two of the four tektite strewn fields (Ivory Coast, Central European), a possible connection to impact craters (Bosumtwi, and Ries, respectively) has been suggested on the basis of chemical, isotopic, and...