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Salto de viscosidad en el manto medio de la Tierra

Maxwell L Rudolph1, Vedran Lekić2, Carolina Lithgow-Bertelloni3

  • 1Department of Geology, Portland State University, Post Office Box 751, Portland, OR 97207, USA. maxwell.rudolph@pdx.edu.

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Los científicos encontraron un aumento significativo en la viscosidad del manto profundo entre 800 y 1200 km de profundidad. Este descubrimiento ayuda a explicar fenómenos como placas tectónicas estancadas y plumas de manto desviadas.

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Área de la Ciencia:

  • La geofísica
  • Ciencias de la Tierra
  • Dinámica del manto

Sus antecedentes:

  • La viscosidad del manto profundo influye en la evolución térmica de la Tierra, la dinámica del penacho y la mezcla de materiales.
  • La comprensión de las capas del manto es crucial para comprender los procesos geológicos a gran escala.

Objetivo del estudio:

  • Para inferir las capas viscosas del manto profundo de la Tierra sin suposiciones previas.
  • Investigar la relación entre las variaciones de viscosidad y las estructuras profundas del manto observadas.

Principales métodos:

  • Reanálisis de datos de geoide no hidrostático de larga longitud de onda.
  • El uso de un nuevo método para determinar las variaciones de viscosidad con la profundidad.

Principales resultados:

  • Se detectó un aumento sustancial en la viscosidad del manto a profundidades de 800 a 1200 km.
  • Este aumento de la viscosidad se produce por debajo de la zona de transición del manto.
  • La profundidad del aumento de la viscosidad se correlaciona con las observaciones sísmicas del estancamiento de la losa y la desviación de la pluma.

Conclusiones:

  • El aumento inferido de la viscosidad proporciona una explicación unificadora para los fenómenos observados en el manto profundo.
  • Este hallazgo desafía las suposiciones anteriores sobre la capas de viscosidad del manto.
  • Destaca la importancia de la estructura de viscosidad en la dinámica del manto profundo.