Tectonic Processes and Magmatic Evolution in Orogenic Belts
Summary
Orogenic belts arise where tectonic plates converge, driving crustal thickening, mountain building and complex magmatic responses. Subduction of oceanic lithosphere beneath continental or island arcs generates melt in the mantle wedge and lower crust, producing a spectrum of magmas from basaltic to silicic compositions. As collision proceeds, crustal shortening and thickening promote partial melting of lower crustal rocks, giving rise to adakitic and I-type granitoids. Subsequent slab break-off, slab-tearing or lithospheric delamination can trigger extensional regimes and back-arc basin development, further diversifying magmatic outputs through decompression melting and mantle upwelling. Throughout these stages, isotopic and geochemical signatures record shifts in source components—from depleted mantle to enriched lithospheric mantle and ancient crustal residues. Understanding these processes illuminates the spatial and temporal distribution of mineral deposits, informs seismic hazard assessment and refines models of continental growth and recycling. Recent advances employ high-precision geochronology, in situ isotopic mapping and geodynamic modelling to unravel the links between orogenic mechanics and magmatic evolution on global scales.
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Tectonic Processes and Magmatic Evolution in Orogenic Belts publication trend
The graph below shows the total number of articles in tectonic processes and magmatic evolution in orogenic belts across all publications each year (not limited to Nature Index journals).
Technical terms
Orogenic belt: A mountain chain formed by plate convergence and crustal deformation.
Subduction: The sinking of one tectonic plate beneath another into the mantle.
Back-arc basin: A marine basin formed by extension behind a volcanic arc.
Adakitic magma: High-Sr/Y and La/Yb calc-alkaline melts reflecting thickened lower crust melting.
Slab break-off: Detachment of a subducted plate segment, often provoking mantle upwelling.
Partial melting: The selective melting of minerals within solid rock to generate magma.
I-type granitoid: Granitic rock derived from igneous protoliths, metaluminous in character.
S-type granitoid: Peraluminous granite generated by melting of sediment-derived crustal sources.
References
- Development of a cambrian back-arc basin in the North Qilian orogenic belt: New constraints from gabbros in Yushigou ophiolite. Frontiers in Earth Science (2023).
- Silurian to Early Devonian tectonic evolution of the southeastern Qilian Orogen inferred from zircon U–Pb dating and geochemistry of intrusive rocks. Journal of the Geological Society (2023).
- Petrogenesis of early–middle paleozoic granitoids in the qilianblock, northwest China: Insight into the transition from adakitic to non-adakitic magmatism in a post-collisional extensional setting. Frontiers in Earth Science (2022).
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