Petrological-Thermomechanical Modeling of the Northern Segment of the Kamchatka Subduction Zone: Thermal Structure, Dehydration, and Magmatism

   Two series of numerical experiments were conducted simulating the initiation and evolution of the subduction of the Pacific plate beneath the Northern segment of Kamchatka subduction zone. In the first series, the self-developing submergence of the slab was modeled with the initial kinematic and physical parameters of the Kamchatka subduction zone. In the second series, a new element of the regional subduction model was introduced and tested — a zone of kinematic stabilization in the asthenospheric mantle to ensure a shallower trajectory of slab submergence. In the first series of numerical experiments (without the stabilization zone), a steeply dipping subduction not corresponding to the slab configuration according to existing geophysical data was obtained, with complete absence of magmatism during the first 14 million years of model time. In the second series (with the stabilization zone), the slab configuration according to seismotomography data was reproduced, and P-T trends (geotherms) for the surface of the slab and the base of the oceanic crust (Moho boundary) were constructed. Manifestations of volcanism in the second series were observed starting from 9 million years. The volcanism is predominantly acidic in composition, and volcanic structures are located at a distance of 200 km from the trench, which corresponds to the spatial arrangement of the East Kamchatka volcanic belt relative to the trench.

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