Tectonic Processes and Crustal Evolution in Mountain Belts

Mountain belts form where tectonic plates converge, invoking a complex interplay of subduction, collision, crustal accretion and magmatism. At active margins, oceanic lithosphere descends beneath continental or other oceanic plates, generating volcanic arcs and accretionary prisms. Continued convergence leads to continental collision, crustal thickening and high-pressure metamorphism, followed by uplift and erosion that expose deep crustal roots. Slab rollback and break-off can trigger back-arc extension, crustal delamination and rejuvenation of magmatic activity, reshaping orogenic architecture. These processes collectively recycle crustal material, contribute to continental growth and influence seismic and geothermal hazards. Studies now emphasise the feedbacks between fluid migration, metamorphic reactions and mechanical localisation that control orogenic wedge stability and erosion rates. A global view reveals recurrent cycles of accretion and collision—from the assembly of Pangaea to active orogens today—underpinning crustal heterogeneity and mineral resource distribution.

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New tectonic models for the closure of the Proto-Tethys and Palaeo-Tethys oceans propose oblique subduction beneath ribbon continents, producing interleaved basement and juvenile crust. This mechanism explains repeated high-pressure metamorphism and magmatic pulses at ~500–490 Ma and ~440–430 Ma in the Central China Orogenic Belt, illustrating how strain partitioning during oblique convergence drives slivering and lateral terrane repetition.

A synthesis of Late Paleozoic–Early Mesozoic evolution in the East Kunlun Orogen outlines the spreading, northward subduction and eventual collision of the Paleo-Tethys (Buqingshan) Ocean. Carboniferous–Middle Permian ocean spreading gave way to continental magmatism and forearc basin development (270–240 Ma), followed by terrane collision and closure (~240–230 Ma) and post-collisional magmatic flare-ups with implications for orogenic gold and polymetallic mineralisation.

Investigations of Early Paleozoic mafic intrusions and high-Mg andesites in the North Altun highlight slab rollback beneath an active arc–back-arc system. Geochronology (515–460 Ma), geochemistry and Nd isotopes reveal asthenospheric upwelling after slab retreat, driving magmatism that records transition from subduction-dominated compression to back-arc extension and crustal thinning.

Tectonic Processes and Crustal Evolution in Mountain Belts publication trend

The graph below shows the total number of articles in tectonic processes and crustal evolution in mountain belts across all publications each year (not limited to Nature Index journals).

Technical terms

Subduction: The process by which one tectonic plate sinks beneath another into the mantle at a convergent boundary.

Orogeny: A mountain-building event involving crustal deformation, metamorphism and magmatism during plate convergence.

Slab rollback: The retreat of a subducting plate hinge in the trench, often inducing back-arc extension.

Crustal accretion: The addition of material—such as sediments, oceanic crust and island arcs—to continental margins.

Crustal delamination: The removal of dense lower crust and mantle lithosphere into the mantle, leading to isostatic uplift and magmatism.

References

1. An oblique subduction model for closure of the Proto-Tethys and Palaeo-Tethys oceans and creation of the Central China Orogenic Belt. Earth-Science Reviews (2023).
2. Paleo-Tethyan Ocean Evolution and Indosinian Orogenesis in the East Kunlun Orogen, Northern Tibetan Plateau. Minerals (2022).
3. Early Paleozoic slab rollback in the North Altun, Northwest China: New evidence from mafic intrusions and high-Mg andesites. Lithosphere (2018).