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Capa de eyección de impacto del Devónico medio: posible conexión con las extinciones masivas globales.

Brooks B Ellwood¹, Stephen L Benoist, Ahmed El Hassani

¹Department of Geology and Geophysics, Louisiana State University, E235 Howe-Russell Geoscience Complex, Baton Rouge, LA 70803, USA.

Science (New York, N.Y.)

|June 14, 2003

Resumen

Un impacto de un asteroide a mediados del Devónico en Marruecos está vinculado a un importante evento de extinción marina. La evidencia incluye cuarzo de choque y anomalías químicas, lo que podría causar la extinción del 40% de las generaciones marinas.

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Área de la Ciencia:

Geología Geología Geología.
Paleontología Paleontología.
Ciencias planetarias Ciencias planetarias.

Sus antecedentes:

El período devónico medio experimentó cambios ambientales significativos y cambios en la biodiversidad.
Los eventos de extinción masiva pueden alterar drásticamente los ecosistemas marinos y las trayectorias evolutivas.

Objetivo del estudio:

Para investigar posibles pruebas de impacto extraterrestre en el desierto de Anti Atlas, Marruecos.
Para determinar si este evento de impacto se correlaciona con la extinción de Kacák/otomari.

Principales métodos:

Análisis geoquímico para las anomalías elementales (Ni, Cr, As, V, Co).
Examen petrográfico de cuarzo y microesferulas conmocionadas.
Análisis de isótopos estables (isótopos de carbono) para detectar cambios ambientales.

Principales resultados:

Descubrimiento de cuarzo sacudido, concentraciones anómalas de elementos específicos y microesferas en Jebel Mech Irdane.
Se registró una excursión significativa de isótopos de carbono negativos (-9 por mil).
La evidencia del impacto está fechada en el Devónico medio, coincidiendo con el evento de extinción Kacák/otomari.

Conclusiones:

Los hallazgos proporcionan una fuerte evidencia de un impacto de bólido en el Devónico medio.
Este evento de impacto es un desencadenante potencial para la mayor extinción marina, que eliminó hasta el 40% de las generaciones marinas.