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Flare-up in Cordilleran arcs controlled by fluxes in subduction water budgets |
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10.1016/j.tecto.2024.230457 |
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The tempo of subduction-related magmatic activity over geological time is episodic. Despite intense study and its importance to crustal growth, the fundamental drivers of this episodicity remains unclear. We demonstrate quantitatively a first order relationship between arc flare-up events and high subduction flux. The volume of oceanic lithosphere entering the mantle is the key parameter that regulates the proportion and rate of H2O entering the sub-arc. New estimates of subduction zone H2O flux over the last 150 million-years indicate a three-to five-fold increase in the proportion of H2O entering the sub-arc during the most recent global pulse of magmatism. Step changes in H2O flux enable proportionally greater partial melting in the sub-arc mantle leading to a flare-up episode. Similar magmatic flare-ups in the ancient Earth could be related to variability in slab flux associated with supercontinent cycles. |
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Tectonophysics, v.888, p. 1-11 |
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