Tectonic Processes and Metamorphic Evolution in Subduction Zones
Summary
Subduction zones mark the boundaries where one lithospheric plate descends beneath another into the mantle, driving a suite of tectonic, thermal and fluid-mediated processes. As oceanic crust is subducted, it undergoes progressive metamorphism—from zeolite and blueschist facies at high pressure–low temperature (HP/LT) conditions, to eclogite facies in deeper reaches. The release of bound water from hydrous minerals substantially lowers melting temperatures in the overlying mantle wedge, fuelling arc magmatism. Simultaneously, mechanical interactions along the plate interface generate an accretionary prism, subduction channel and forearc basin. Exhumation of HP/LT metamorphic rocks occurs via buoyant return flow within a narrow shear zone or by underplating and wedge-driven uplift, preserving a record of pressure–temperature–deformation (P–T–D) paths. These processes govern crustal recycling, continental growth and seismicity, and inform our understanding of orogeny, ore formation and long-term climate regulation through volatile cycling.
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Tectonic Processes and Metamorphic Evolution in Subduction Zones publication trend
The graph below shows the total number of articles in tectonic processes and metamorphic evolution in subduction zones across all publications each year (not limited to Nature Index journals).
Technical terms
Subduction channel: A narrow, ductile shear zone at the interface between descending and overriding plates, through which rocks may return toward the surface during exhumation.
Blueschist facies: A metamorphic grade characterised by high pressure and low temperature, defined by the stable assemblage of glaucophane, lawsonite or epidote.
Eclogite facies: A high-pressure, moderate-to-high-temperature metamorphic regime forming garnet–omphacite assemblages, indicative of depths exceeding ~50 km.
Elastic thermobarometry: A technique that exploits residual elastic strains in mineral inclusions to determine precise pressure–temperature conditions of mineral growth.
Underplating: The process by which subducted material or wedge-derived slices are accreted and welded to the base of the overriding plate, contributing to crustal thickening and exhumation.
References
- The Cycladic Blueschist Unit of the Hellenic subduction orogen: Protracted high-pressure metamorphism, decompression and reimbrication of a diachronous nappe stack. Earth-Science Reviews (2022).
- Subduction, Underplating, and Return Flow Recorded in the Cycladic Blueschist Unit Exposed on Syros, Greece. Tectonics (2022).
- Insights from elastic thermobarometry into exhumation of high-pressure metamorphic rocks from Syros, Greece. Solid Earth (SE) (2021).
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