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Metamorfismo de choque de las rocas del cráter de impacto de Bosumtwi, atenuación de choques y formación de elevación
Ludovic Ferrière1, Christian Koeberl, Boris A Ivanov
1Department of Lithospheric Research, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria.
Science (New York, N.Y.)
|December 17, 2008
Resumen
La investigación del cráter Bosumtwi revela una atenuación de choque en su elevación central. La falla frágil, no la deformación dúctil, domina la elevación en cráteres de impacto de tamaño moderado.
Área de la Ciencia:
- Geología Geología Geología.
- Ciencias planetarias Ciencias planetarias.
- El cráter de impacto es el cráter de impacto.
Sus antecedentes:
- Las estructuras de impacto complejas carecen de restricciones precisas sobre la atenuación de la onda de choque y la formación de elevación central.
- Comprender estos procesos es crucial para interpretar los eventos de impacto en la Tierra y otros planetas.
Objetivo del estudio:
- Para restringir la atenuación de ondas de choque y la mecánica de elevación central en cráteres de impacto complejos de tamaño moderado.
- Para reconstruir la posición previa al impacto de las rocas del sótano perforadas en el cráter Bosumtwi.
Principales métodos:
- Análisis del metamorfismo de choque en las rocas del sótano perforadas del cráter Bosumtwi.
- Modelado numérico de la deformación y modificación de la roca inelástica durante el levantamiento central.
- Análisis petrográfico para cuantificar los granos de cuarzo sacudidos y las características de deformación plana.
Principales resultados:
- Se reconstruyeron las posiciones rocosas previas al impacto y se reveló una atenuación de choque de aproximadamente 5 gigapascales en los 200 metros superiores de la elevación central.
- Identificó la proporción de granos de cuarzo golpeados y las características de deformación plana como indicadores sensibles de la presión de choque.
- Demostró que la falla de fragilidad, en lugar de la deformación dúctil, domina la formación de elevación central en cráteres de tamaño moderado.
Conclusiones:
- La atenuación de las ondas de choque en cráteres complejos se puede cuantificar utilizando indicadores de metamorfismo de choque.
- La formación de elevación central en estructuras de impacto de tamaño moderado está controlada principalmente por mecanismos de falla de fragilidad.
- El estudio proporciona un modelo refinado para comprender la evolución de los cráteres de impacto.
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