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Extension-driven evolution of magmatic systems in slab-top basins: insights from the Timok magmatic complex, Serbian Carpathians
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DOI：10.3389/feart.2026.1781275.png)
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Abstract
En 中文
Slab-top basins represent key archives of the interaction between subduction dynamics, lithospheric extension, and magmatism. This study presents the first basin-scale tectono-magmatic model for the Late Cretaceous evolution of the Timok Magmatic Complex (TMC) basin, a segment of the Apuseni-Banat-Timok-Srednogorie (ABTS) magmatic belt in SE Europe. Integration of detailed structural and kinematic analyses with zircon U-Pb geochronology of syn-tectonic intrusions reveals that the TMC basin formed as a strongly asymmetric slab-top basin under E-W to NE-SW extension driven by retreat of the Neotethys slab. Early basin development was dominated by border-fault-controlled subsidence and sedimentation, followed at similar to 88-87 Ma by migration of deformation into the basin interior and localization along a major intra-basin normal fault corridor in the eastern part of the basin, which focused syn-tectonic calc-alkaline magmatism and hydrothermal activity. Between similar to 88 and 81 Ma, deformation and magmatism propagated laterally along strike, tracking progressive growth of the fault system, whereas after similar to 81 Ma extensional deformation waned and magmatism migrated westward and became increasingly decoupled from faulting. By similar to 76 Ma, the basin entered a post-rift stage marked by shallow-marine carbonate deposition and regressive molasse sedimentation. These results demonstrate that slab rollback exerts a first-order control on the spatiotemporal coupling between deformation, basin evolution, and magmatism in slab-top extensional systems.
Keywords:
fault kinematics
neotethys subduction
slab-top basin
tectono-magmatic evolution
timok magmatic complex
zircon U-Pb geochronology
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