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El adelgazamiento de la corteza compensada por magma en las zonas de grieta continental
1Department of Geography and Geology, University of Copenhagen, Oester Voldgade 10, DK-1350 Copenhagen K, Denmark. thybo@geo.ku.dk
Nature
|February 13, 2009
Resumen
La zona de rift del Baikal muestra una zona de alta velocidad única en la corteza inferior, desafiando los modelos convencionales de rift continental. Esto sugiere que la intrusión magmática juega un papel clave en el desarrollo de grietas.
Área de la Ciencia:
- La geofísica es la geofísica.
- La tectónica es la tectónica.
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- Las zonas de grieta continental son depresiones tectónicas formadas por la extensión litosférica.
- Rifting puede conducir a la formación de la corteza oceánica o cuencas sedimentarias.
- Los modelos convencionales predicen la reducción de la profundidad de Moho y la reducción de la velocidad sísmica del manto.
Objetivo del estudio:
- Para investigar las características de la corteza y el manto de la zona de grieta del Baikal.
- Para probar los modelos de fisuras convencionales contra los nuevos datos sísmicos.
- Para entender el papel del magmatismo en el rifting continental.
Principales métodos:
- Adquisición de un nuevo perfil sísmico a través del sur del lago Baikal.
- Análisis de datos sísmicos para determinar las estructuras de la corteza y el manto.
- Comparación de las características observadas con modelos de fisuras establecidos.
Principales resultados:
- La zona de grieta del Baikal exhibe un canal topográfico superficial, pero carece del esperado descenso de profundidad de Moho.
- Se identificó una zona localizada, de alta velocidad y altamente reflectante en la corteza inferior.
- Esta zona se interpreta como una intrusión magmática significativa en la corteza inferior.
Conclusiones:
- La zona de rift del Baikal se desvía de los modelos convencionales de rifting.
- La intrusión magmática en la corteza inferior compensa el levantamiento esperado de Moho.
- Esto pone de relieve un papel no reconocido previamente del magmatismo en los procesos de rifting continental.
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