Subduction Zone Dynamics and Continental Crust Evolution

Subduction zones are fundamental engines of plate tectonics, where oceanic lithosphere descends into the mantle, driving seismicity, magmatism and crustal recycling. The interaction of a subducting slab with the overlying mantle wedge governs fluid release, mantle melting and arc volcanism. At the trench, sediments and oceanic crust may be accreted to form a prism or removed by subduction erosion, altering forearc architecture and sediment budgets. Magmatic additions over geological time build and rework continental crust, with compositional evolution reflecting variable contributions from slab-derived fluids, mantle sources and recycled crustal fragments. Deep-mantle anomalies, including large low-shear-velocity provinces, modulate plume upwellings whose large igneous provinces provide complementary pulses of crust generation. The balance of accretionary growth and erosive loss shapes continental margins, influences topography, controls resource distribution and informs seismic and volcanic hazard assessments worldwide.

Research from Nature Portfolio

Recent studies have reconstructed pulses of mantle plume upwellings linked to a deep large low-shear-velocity province, revealing episodic delivery of vast melt volumes that formed oceanic plateaus and influenced seawater chemistry and mass extinctions. Petrological modelling underscores interaction between upwellings and mid-ocean ridges in generating layered crustal sequences. Work on Early Miocene volcanism in Central Panama demonstrates that subaerial felsic to mafic eruptions contributed directly to regional uplift and isthmus emergence, emphasising the role of arc magmatism in sculpting continental connections. These findings highlight the interplay between deep-mantle processes and subduction-driven volcanism in shaping crustal growth and palaeogeography.

Subduction Zone Dynamics and Continental Crust Evolution publication trend

The graph below shows the total number of articles in subduction zone dynamics and continental crust evolution across all publications each year (not limited to Nature Index journals).

Technical terms

Subducting slab: The oceanic lithospheric plate descending into the mantle at a convergent boundary.

Mantle wedge: The zone of mantle above the subducting slab that heats, hydrates and partially melts to feed arc magmatism.

Subduction erosion: The process by which material from the base or front of the overriding plate is removed into the subduction channel.

Accretionary prism: A wedge of sediments and crustal fragments scraped off the subducting plate and added to the overriding margin.

Forearc: The domain between the trench and volcanic arc, comprising accretionary prism, basins and structural highs.

Large low-shear-velocity province (LLSVP): A deep-mantle region with anomalously low seismic velocities, interpreted as thermochemical anomalies that can generate mantle plumes.

Depositionary forearc: A forearc type formed when sediments are directly deposited onto a margin undergoing subduction erosion.

References

1. Insights into the role of tectonic extension and compression vs. subduction erosion in the tectonics of forearcs: Examples from the Japan Trench and the Middle America Trench. Earth-Science Reviews (2024).
2. Record of massive upwellings from the Pacific large low shear velocity province. Nature Communications (2016).
3. Origin and dynamics of depositionary subduction margins. Geochemistry Geophysics Geosystems (2016).
4. Volcanic contribution to emergence of Central Panama in the Early Miocene. Scientific Reports (2019).
5. Seamount chain–subduction zone interactions: Implications for accretionary and erosive subduction zone behavior. Geology (2018).