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El adelgazamiento litosférico debajo de las regiones de grietas del sur de California
Vedran Lekic1, Scott W French, Karen M Fischer
1Department of Geological Sciences, Brown University, Providence, RI 02912, USA. vedran_lekic@brown.edu
Science (New York, N.Y.)
|October 8, 2011
Resumen
La ruptura de las placas tectónicas causa la evolución continental y oceánica. Este estudio revela el adelgazamiento litosférico en las zonas de grietas, lo que indica una localización de tensión eficiente y una extensión simétrica, no un simple corte.
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:
- La evolución de los continentes y los océanos está impulsada por la ruptura de las placas tectónicas.
- La comprensión de la deformación litosférica durante la ruptura es crucial, pero sigue siendo poco comprendida.
Objetivo del estudio:
- Para investigar los procesos de deformación de la litosfera durante la ruptura.
- Para restringir el adelgazamiento litosférico y la localización de la tensión en las zonas de fisuras.
Principales métodos:
- Utilizando la dispersión de ondas de cizallamiento telesísmico debajo de las zonas de fisuras y áreas adyacentes en el sur de California.
- Resolviendo el límite litosférico-astenosférico y las variaciones de espesor litosférico.
Principales resultados:
- Se observó un adelgazamiento litosférico sustancial y lateralmente abrupto debajo de las regiones de grietas.
- Se identificó una localización eficiente de la cepa en el Salton Trough, con un adelgazamiento significativo de la litosfera del manto o la creación de una nueva litosfera.
- No se encontró ninguna compensación sistemática entre la deformación litosférica superficial y profunda.
Conclusiones:
- Los resultados son consistentes con la extensión litosférica simétrica.
- Se descartó el cizallamiento simple a lo largo de las zonas de cizallamiento unidireccional de poca profundidad como el mecanismo de deformación primario.
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