%0 Journal Article
%A Bermejo López, Daniel
%A Ortega Menor, Lorena
%A Barrios Sánchez, Santos
%A Tavazzani, Lorenzo
%A Castiñeiras García, Pedro
%A Chelle-Michou,   Cyril
%A Crespo Feo, María Elena
%A Dos Santos Alves, Kelvin
%A Gómez Barreiro, Juan
%T Late Variscan tectonic orogenic collapse as a trigger for Sn-W mineralizing systems. U-Pb ore geochronology across the Martinamor gneissic dome (Salamanca, Spain)
%D 2024
%@ 0169-1368
%U https://hdl.handle.net/20.500.14352/122983
%X Regional tectonothermal evolution is a primary factor for many mineral deposits formation. Late orogenic gravitational collapse has been widely recognized across different orogens, including the Variscan belt. The Martinamor gneissic dome is a well constrained structure related to the late-Variscan orogenic collapse in the Iberian Massif. We have investigated Sn-W mineralization spatially related to the Martinamor dome by LA-ICP-MS U-Pb dating of cassiterite and wolframite, revealing a wide mineralization timespan of 40 Myr. Our results show: a) an early (338.1 ± 5.8 Ma), minor mineralization phase, (W-dominated), potentially related to Variscan compressive phases; b) a second, major stage which lasted from 324.1 ± 5.9 to 300.7 ± 5.4 Ma, which includes Sn-bearing pegmatites and Sn-W veins formed under the syn-collisional extensional collapse. Structural evidence highlights the role of extensional detachments in channeling mineralizing fluids and creating suitable traps under ductile and ductile–brittle conditions; it also explains the temporal and spatial distribution of the Sn-W vein-type mineralizations in the zone.Comparisons with other Variscan deposits in the Iberian Massif and European counterparts suggest a regional metallogenic cycle linked to late-Variscan extensional collapse, heat advection, and crustal partial melting processes. These findings underscore the Martinamor dome as a unique structure recording a protracted Variscan tectono-magmatic-metallogenic event, with implications for understanding Sn-W deposit formation in orogenic settings.
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