Which geological feature primarily results from mantle upwelling during oceanic plate subduction?

💡 Explanation

When an oceanic plate subducts, the release of water from the slab into the mantle wedge causes partial melting and mantle upwelling, leading to volcanism and the formation of a back-arc basin. Therefore a back-arc basin forms rather than transform faults, rift valleys, or trench deepening which involve different tectonic regimes.

• Which outcome occurs when rapid isostatic rebound exposes coastal alluvial deposits after deglaciation?
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• Near river floodplains, which process results in loess accumulation?
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