Hi team, I would like some help from you with the following questions: Which of

Question

Hi team, I would like some help from you with the following questions:

Which of the following tectonic settings favors large-scale, dewatering (via seawater-saturated slab)-flux melting of the upper mantle (wedge) that produces volatile-rich, explosive basaltic, andesitic and rhyolitic arc magmas?

Both oceanic-oceanic and oceanic-continental convergent plate boundaries

Continental-continental convergent plate boundary

Divergent plate boundary

Transform plate boundary

Hot spot

Both oceanic-oceanic and oceanic-continental convergent plate boundaries

Continental-continental convergent plate boundary

Divergent plate boundary

Transform plate boundary

Hot spot

Explanation / Answer

Hi team, I would like some help from you with the following questions:

Which of the following tectonic settings favors large-scale, dewatering (via seawater-saturated slab)-flux melting of the upper mantle (wedge) that produces volatile-rich, explosive basaltic, andesitic and rhyolitic arc magmas?

Both oceanic-oceanic and oceanic-continental convergent plate boundaries

Continental-continental convergent plate boundary

Divergent plate boundary

Transform plate boundary

Hot spot

Answer:

Both Oceanic – Oceanic and Oceanic – Continental convergent plate boundaries tectonic setting favors large scale dewatering flux melting of the upper mantle that produces volatile ric, explosive basaltic, andesitic and rhyolitic arc magmas.

If two tectonic plates converge, one or both plates of oceanic lithosphere form subduction zone and one of these plates sink back to mantle.

Beneath 100 km depth of surface the high pressure creates metamorphism in hydrothermal minerals which become denser and not contain bonded water,

Beneath 100 km depth of surface the high pressure creates metamorphism in hydrothermal minerals which become denser and not contain bonded water,

This metamorphic dewatering process gives out water from descending crust. The water sweeps in to the overlying wedge of the mantle. The addition of water to hot mantle rocks lowers their melting temperatures and forms partially melting ultramafic rocks

Both oceanic-oceanic and oceanic-continental convergent plate boundaries

Continental-continental convergent plate boundary

Divergent plate boundary

Transform plate boundary

Hot spot

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