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Microtektitas y extinciones masivas: evidencia de un impacto de un asteroide devónico tardío
Science (New York, N.Y.)
|August 21, 1992
Resumen
Los investigadores descubrieron esferas de vidrio, que se asemejan a las microtektitas, cerca de la frontera entre Frasnian y Famennian en Bélgica. Sus características sugieren un origen de impacto, lo que potencialmente vincula este evento con la extinción masiva del Devónico Superior.
Área de la Ciencia:
- Geología Geología Geología.
- Paleontología Paleontología.
- Ciencias planetarias Ciencias planetarias.
Sus antecedentes:
- El límite Frasniano-Famenniano (F/F) marca un importante evento de extinción masiva marina en el Devónico Superior.
- Las microtektitas a menudo se asocian con grandes eventos de impacto.
Objetivo del estudio:
- Para investigar el origen y la importancia de las esferas de vidrio encontradas cerca de la frontera F/F en Senzeilles, Bélgica.
- Para evaluar el vínculo potencial entre un impacto extraterrestre y la extinción masiva F/F.
Principales métodos:
- Análisis morfológico de las esferas de vidrio.
- Análisis geoquímico de la composición de las esferulas.
- Comparación con microtektitas conocidas y estructuras de impacto.
Principales resultados:
- Las esferas de vidrio encontradas en Senzeilles exhiben morfologías similares a las de la microtektita (lágrima, mancuerna, compuesto).
- Estas esférulas carecen de cristalitos, tienen pocas vesículas y un bajo contenido de volátiles, consistente con los eyectos de impacto.
- Existen cráteres de impacto candidatos de edad similar (anillo de Siljan, Charlevoix).
Conclusiones:
- Las características de las esferulas de Senzeilles apoyan fuertemente un origen de impacto.
- La presencia de estas esferulas similares a la microtektita cerca del límite F/F proporciona evidencia de un evento de impacto.
- Este evento de impacto es una causa potencial para las extinciones masivas del Devónico Superior.
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