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Viscosidad y dinámica de la litosfera de alta resolución reveladas por imágenes magnetotelúricas

Lijun Liu¹, Derrick Hasterok²

¹Department of Geology, University of Illinois at Urbana-Champaign, Champaign, IL 61820, USA. ljliu@illinois.edu.

Science (New York, N.Y.)

|October 7, 2016

Resumen

Las encuestas magnetotelúrgicas revelan la viscosidad litosférica, crucial para comprender la dinámica de la Tierra. Este método modela con precisión la topografía y el flujo ascendente del manto, ofreciendo mejores restricciones que los experimentos de laboratorio.

Área de la Ciencia:

La geofísica
La geodinámica
Ciencias de la Tierra

Sus antecedentes:

La viscosidad litosférica precisa es esencial para modelar los procesos geodinámicos.
Los métodos anteriores para determinar la viscosidad tienen limitaciones.

Objetivo del estudio:

Para inferir la viscosidad litosférica efectiva mediante el uso de datos magnetotellúricos (MT).
Para validar la viscosidad inferida mediante el modelado geodinámico.

Principales métodos:

Encuesta magnetotellúrica (MT) de alta resolución en el oeste de los Estados Unidos.
Aproximación de la estructura de viscosidad de la resistividad eléctrica.
Modelado geodinámico que incorpora la viscosidad inferida.

Principales resultados:

Predicción exitosa de la topografía de la superficie de longitud de onda corta.
Modelado preciso de la deformación litosférica y el surgimiento del manto.
Restricciones de viscosidad superiores a la reología basada en el laboratorio.

Conclusiones:

Las imágenes de MT son una herramienta práctica para restringir la viscosidad litosférica.
Este enfoque mejora la comprensión de la dinámica de la litosfera continental.
La resistividad eléctrica sirve como un sustituto confiable para la resistencia mecánica.

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