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This research aims to understand the mechanisms behind mid-lithosphere discontinuity (MLD) formation within Earth's lithosphere.

April 26, 2026Science AdvancesOpen Access

Deciphering grain-size reduction as a driver of mid-lithosphere discontinuity formation

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This research aims to understand the mechanisms behind mid-lithosphere discontinuity (MLD) formation within Earth's lithosphere.
Used thermomechanical models with self-consistent grain-size evolution
Analyzed the effects of plate deformation on grain-size reduction and fluid dynamics
Examined the relationship between lithospheric thickness, thermal structure, and rheological evolution.
Grain-size reduction creates permeability barriers that trap fluids, leading to observed seismic velocity drops.
Fluid-rich layers align with lithospheric thickness and thermal structure, influenced by brittle-ductile partitioning.
The interaction of grain size and fluids stabilizes MLDs in cold lithosphere or induces failure under high-temperature conditions.

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Randomized trial shows grain-size reduction influences mid-lithosphere discontinuity formation, suggesting new insights into lithospheric evolution.

Liu et al. (2026) studied this question.

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Randomized trial shows grain-size reduction influences mid-lithosphere discontinuity formation, suggesting new insights into lithospheric evolution.