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Horizonte de eyección de impacto dentro de las pizarras precámbricas tardías, geosinclina de Adelaide, Australia del
Science (New York, N.Y.)
|July 11, 1986
Resumen
Fragmentos rotos de roca volcánica encontrados en el sur de Australia sugieren un evento de impacto distante de hipervelocidad. La evidencia apunta a un impacto en el lago Acraman, creando una capa de eyección extendida.
Área de la Ciencia:
- Geología Geología Geología.
- Estudios de cráteres de impacto Estudios de cráteres de impacto
- Geocronología Geocronología.
Sus antecedentes:
- Las pizarras marinas del precámbrico de la geosinclina de Adelaida albergan formaciones geológicas únicas.
- Comprender el origen de los fragmentos geológicos es crucial para el mapeo geológico regional.
Objetivo del estudio:
- Para investigar el origen y la ubicación de una capa solitaria de fragmentos de roca de la corteza terrestre destrozada.
- Para determinar si los fragmentos son evidencia de un evento de impacto de hipervelocidad.
Principales métodos:
- Mapeo de campo y seguimiento de la capa de eyección a lo largo de 260 km.
- Análisis petrográfico de fragmentos de roca, incluidos granos minerales y conos de ruptura.
- Análisis geoquímico para determinar la composición y la edad de las rocas.
Principales resultados:
- Se identificó una capa de 260 km de largo de fragmentos de roca volcánica destrozada (1575 Ma) dentro de 600 Ma de esquisto marino.
- Los fragmentos exhiben láminas de choque en cuarzo y pequeños conos de rotura, indicativos del impacto.
- La evidencia sugiere la caída vertical del emplazamiento de fragmentos de un evento de impacto distante.
Conclusiones:
- Los fragmentos de roca se originaron en un impacto de hipervelocidad en el lago Acraman, aproximadamente a 300 km al oeste.
- Los hallazgos contribuyen a comprender la formación de cráteres de impacto y la distribución de los eyectos en terrenos antiguos.
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