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El origen del complejo de Sudbury por impacto meteorítico: evidencia isotópica de neodimio
Science (New York, N.Y.)
|October 25, 1985
Resumen
Los datos isotópicos de samario y neodimio revelan el complejo de Sudbury.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- Geología de Isótopos Geología de Isótopos.
- Geología económica Geología económica.
Sus antecedentes:
- El complejo de Sudbury en Canadá es una característica geológica significativa con importancia económica.
- Comprender su origen es crucial para la investigación geológica y de impacto.
Objetivo del estudio:
- Para determinar la edad de cristalización ígnea del Complejo Sudbury.
- Para investigar el origen del Complejo Sudbury utilizando datos geoquímicos e isotópicos.
Principales métodos:
- Análisis isotópico de samario-neodimio (Sm-Nd) en rocas y minerales enteros.
- Análisis de concentración de elementos de tierras raras (REE). análisis de concentración de elementos de tierras raras (REE).
Principales resultados:
- Se determinó una edad de cristalización ígnea de 1840 ± 21 millones de años para el Complejo de Sudbury.
- Los valores iniciales de epsilon neodimio (εNd) y los patrones de REE indican la formación de fundidos en la parte superior de la corteza.
- Las firmas geoquímicas son consistentes con un origen de impacto meteorítico.
Conclusiones:
- El complejo de Sudbury se originó a partir de fusiones generadas en la corteza superior.
- Los datos geoquímicos e isotópicos apoyan firmemente un modelo de impacto meteorítico para la formación del Complejo Sudbury.
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