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Rapid subduction initiation and magmatism driven by internal vertical forces?

Updated: Oct 10

Ben Maunder and his colleagues tell us about vertically forced SZI:


"A continuous, in situ record of subduction zone initiation was recovered from the fore-arc of the Izu-Bonin-Mariana subduction system, revealing a distinct magmatic progression with a rapid timescale (approximately 1 million years). Using numerical models, we demonstrate that these observations cannot be produced by previously proposed horizontal external forcing. Instead a geodynamic evolution that is dominated by internal, vertical forces produces both the temporal and spatial distribution of magmatic products, and progresses to self-sustained subduction. Such a primarily internally driven initiation event is necessarily whole-plate scale and the rock sequence generated (also found along the Tethyan margin) may be considered as a smoking gun for this type of event."


Maunder et al. (2020, Nature Communications)

Read the full paper here





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