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La estructura de impacto de Acraman: fuente de eyección en las pizarras precámbricas tardías, Australia del Sur
Science (New York, N.Y.)
|July 11, 1986
Resumen
La estructura de Acraman en Australia del Sur es un gran cráter de impacto, probablemente el más grande de Australia. La evidencia sugiere que sí.
Área de la Ciencia:
- Geología Geología Geología.
- El cráter de impacto es el cráter de impacto.
- Geología de Australia del Sur Geología de Australia del Sur
Sus antecedentes:
- Los volcanes dacíticos del Proterozoico Medio en las cordilleras de Gawler albergan una característica geológica significativa.
- La estructura exhibe anillos concéntricos con diámetros de aproximadamente 30 km, 90 km y un potencial de 160 km.
Objetivo del estudio:
- Identificar y caracterizar una importante estructura de impacto probable en el centro de Australia del Sur.
- Para investigar la evidencia geológica de un evento de impacto en la localidad de Acraman.
- Para determinar el origen de las eyecciones dacíticas encontradas en las formaciones geológicas circundantes.
Principales métodos:
- Cartografía geológica de la región de Gawler Ranges.
- Análisis de muestras de roca del lago Acraman para la evidencia de metamorfismo de choque.
- Examen de conos de ruptura y lámelas de choque en granos de cuarzo.
- Correlación de los depósitos de eyecciones con la fuente de impacto sospechosa.
Principales resultados:
- Identificación de una gran estructura de impacto con distintas depresiones internas e intermedias y un posible anillo exterior.
- Descubrimiento de dacita intensamente rota, conos rotos y lámelas de choque en cuarzo dentro del lago Acraman.
- La estructura de Acraman se confirma como la mayor estructura de impacto probable en Australia.
- La estructura ha sido identificada como la probable fuente de eyecciones dacíticas encontradas a 300 km al este.
Conclusiones:
- La estructura de Acraman representa un importante evento de impacto en la historia geológica de Australia.
- Los hallazgos proporcionan información crucial sobre los procesos geológicos a gran escala y sus efectos.
- Esta investigación contribuye a la comprensión de la distribución y el impacto de los eventos extraterrestres en la Tierra.
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