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Science 21 August 1992:
Vol. 257. no. 5073, pp. 1102 - 1104
DOI: 10.1126/science.257.5073.1102
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Articles

Microtektites and Mass Extinctions: Evidence for a Late Devonian Asteroid Impact

Philippe Claeys 1, Jean-Georges Casier 2, and Stanley V. Margolis 1

1 Department of Geology, University of California, Davis, CA 95616
2 Paleontology Department, Belgian Royal Institute of Natural Sciences, rue Vautier, 29, B-1040 Brussels, Belgium

Glass spherules, similar to microtektites, have been found near the Frasnian-Famennian boundary (F/F) (Upper Devonian) at Senzeilles, Belgium, contemporaneous with one of the largest marine mass extinctions of the Phanerozoic. These spherules exhibit a wide range of compositions and display teardrop, dumbbell, and compound morphologies analogous to microtektites. In addition, they lack crystallites, have few or no vesicles, and have a low content of volatile material. These characteristics are supportive of an impact origin. The Siljan Ring (Sweden) and Charlevoix structure (Quebec,Canada) are candidate craters of this age. The presence of microtektites near the F/F boundary supports the hypothesis that an impact caused the Upper Devonian worldwide benthic mass extinctions.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
The history of tektites.
G. J. H. McCall (2006)
Geological Society, London, Special Publications 256, 471-493
   Abstract »    PDF »
Have distal impact ejecta changed through geologic time?.
(2000)
Geology 28, 975-978


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Science. ISSN 0036-8075 (print), 1095-9203 (online)