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Going with the grains to explain a fundamental tectonic force


By Jim Shelton
January 18, 2021
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Mylonite is a fine-grained, compact metamorphic rock produced by dynamic recrystallization of the constituent minerals resulting in a reduction of the grain size of the rock. (Image courtesy of Wikipedia)
A new study suggests that tiny, mineral grains squeezed and mixed over millions of years set in motion the chain of events that plunge massive tectonic plates deep into the Earth’s interior.
The theory, proposed by Yale scientists David Bercovici and Elvira Mulyukova, may provide an origin story for subduction, one of the most fundamental forces responsible for the dynamic nature of the planet. ....

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