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Expresión sísmica profunda de un antiguo límite de placas en Europa
Science (New York, N.Y.)
|July 1, 1994
Resumen
Los datos sísmicos revelan distintas estructuras del manto superior debajo de Europa. Un límite agudo separa el cratón precámbrico frío y de alta velocidad del panerozoico más caliente y de baja velocidad, lo que indica un transporte limitado de material astenosférico.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- La estructura del manto superior debajo de Europa muestra variaciones significativas.
- Comprender estas variaciones es clave para descifrar la historia y los procesos tectónicos.
Objetivo del estudio:
- Para investigar las propiedades sísmicas del manto superior debajo de Europa.
- Delinear el límite entre el cratón del Precámbrico y las regiones europeas más jóvenes.
Principales métodos:
- Análisis de los datos sismológicos.
- Interpretación de las velocidades de onda de corte para inferir temperatura y composición.
Principales resultados:
- Existe un claro contraste en las propiedades sísmicas entre el Precámbrico y el Fanerozoico en Europa.
- El cratón del Precámbrico exhibe altas velocidades de onda de corte, indicativas de temperaturas más bajas.
- Bajas velocidades sísmicas se observan debajo de la Europa Fanerozoica, que se extiende a por lo menos 140 km de profundidad.
Conclusiones:
- La zona de transición sísmica es notablemente nítida, a pesar de su compleja historia tectónica.
- Esta nitidez sugiere un transporte lateral mínimo de material astenosférico a través del límite del cratón.
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