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Pruebas geoquímicas de la estructura de Sudbury para la redistribución de la corteza por impactos de grandes bólidos

James E Mungall¹, Doreen E Ames, Jacob J Hanley

¹Department of Geology, University of Toronto, 22 Russell St, Toronto, Ontario M5S 3B1, Canada. mungall@geology.utoronto.ca

|June 4, 2004

Resumen

Los grandes impactos de asteroides alteraron significativamente la corteza temprana de la Tierra, con la estructura de Sudbury revelando placas de fusión derivadas de la corteza inferior, no del material cortical promedio. Esto sugiere impactos invertidos en las capas de la corteza terrestre y materiales mixtos.

Área de la Ciencia:

Geología Geología Geología.
Ciencias planetarias Ciencias planetarias.
La geoquímica es la geoquímica.

Sus antecedentes:

La deformación de la corteza y el derretimiento durante la formación de cráteres de gran impacto son cruciales para la evolución temprana de la Tierra, pero se entienden poco.
La estructura de Sudbury, de 1.800 millones de años de antigüedad, ofrece una sección de impacto completa y rara.

Objetivo del estudio:

Para investigar la composición y el origen de la hoja fundida del complejo ígneo de Sudbury.
Comprender los efectos de los impactos de hipervelocidad en las capas de la corteza continental.

Principales métodos:

Análisis geoquímico del complejo ígneo de Sudbury y la formación Onaping.
Análisis de abundancia del elemento del grupo del platino.

Principales resultados:

La capa de fusión de Sudbury se deriva predominantemente de la corteza continental inferior, lo que desafía las suposiciones anteriores.
La matriz de la Formación Onaping es una mezcla de estratos sedimentarios, derretimiento de la corteza inferior y material de impacto.
El evento de impacto causó una inversión parcial de las capas de composición de la corteza continental.

Conclusiones:

Los impactos de hipervelocidad pueden alterar e invertir significativamente la composición estratificada de la corteza continental.
El impacto de Sudbury proporciona información clave sobre los procesos de modificación de la corteza terrestre a gran escala en la Tierra y otros planetas terrestres.

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