Earth's deep mantle flows dynamically

phys.org | 3/25/2019 | Staff
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As ancient ocean floors plunge over 1,000 km into the Earth's deep interior, they cause hot rock in the lower mantle to flow much more dynamically than previously thought, finds a new UCL-led study.

The discovery answers long-standing questions on the nature and mechanisms of mantle flow in the inaccessible part of deep Earth. This is key to understanding how quickly Earth is cooling, and the dynamic evolution of our planet and others in the solar system.

Earth - Mantle - Liquid - Time - Flow

"We often picture the Earth's mantle as a liquid that flows but it isn't—it's a solid that moves very slowly over time. Traditionally, it's been thought that the flow of rock in Earth's lower mantle is sluggish until you hit the planet's core, with most dynamic action happening in the upper mantle which only goes to a depth of 660 km. We've shown this isn't the case after all in large regions deep beneath the South Pacific Rim and South America," explained lead author, Dr. Ana Ferreira (UCL Earth Sciences and Universidade de Lisboa).

"Here, the same mechanism we see causing movement and deformation in the hot, pressurised rock in the upper mantle is also occurring in the lower mantle. If this increased activity is happening uniformly over the globe, Earth could be cooling more rapidly than we previously thought", added Dr. Manuele Faccenda, Universita di Padova.

Study - Today - Nature - Geoscience - Researchers

The study, published today in Nature Geoscience by researchers from UCL, Universidade de Lisboa, Universita di Padova, Kangwon National University and Tel Aviv University, provides evidence of dynamic movement in the Earth's lower mantle where ancient ocean floors are plunging towards the planet's core, crossing from the upper mantle (up to ~660 km below the crust) to the lower mantle (~660—1,200 km deep).

The team found that the deformation and increased flow in the lower mantle is likely due to the...
(Excerpt) Read more at: phys.org
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