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La discontinuidad de Gutenberg: el derretimiento en el límite litosfera-astenosfera
1Department of Terrestrial Magnetism, 5241 Broad Branch Road, NW, Washington, DC 20015, USA. nschmerr@dtm.ciw.edu
Science (New York, N.Y.)
|March 24, 2012
Resumen
La discontinuidad de Gutenberg (G) debajo de los océanos puede ser causada por la fusión parcial en la base de la litosfera. Esta señal sísmica se ve reforzada por la dinámica del manto, como las subducciones y surgimientos.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Dinámica del manto Dinámica del manto
Sus antecedentes:
- El límite entre la litosfera y la astenosfera (LAB) separa las placas rígidas del manto convectivo.
- El origen de la discontinuidad de Gutenberg (G), una discontinuidad sísmica en el LAB, se entiende mal.
Objetivo del estudio:
- Para investigar la causa de la discontinuidad de Gutenberg (G) debajo de las placas oceánicas.
- Para determinar si el derretimiento parcial en el límite litosfera-astenosfera (LAB) explica la reflectividad G.
Principales métodos:
- Análisis de los datos sísmicos de los precursores de SS de alta frecuencia.
- Detección intermitente del G como contraste de velocidad negativa a 40-75 km de profundidad debajo de la placa del Pacífico.
Principales resultados:
- El G se observa cerca del LAB en áreas de vulcanismo y producción de fusión.
- Las observaciones son consistentes con una capa intermitente de fusión parcial de la astenosfera en la base litosférica.
Conclusiones:
- La discontinuidad de Gutenberg (G) probablemente resulta del derretimiento parcial en el límite litosférico-astenosférico (LAB).
- La producción de derretimiento se ve reforzada por las afloramientos del manto, la convección a pequeña escala y la liberación de fluidos durante la subducción.
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