Assembly of the Variscan Orogenic Wedge in the Bohemian Massif: Monazite U‐Pb Geochronology of the Tectonic Events Recorded in Saxothuringian Metasediments

The geochronology of metasediments incorporated to orogenic wedges provides an important key in understanding the early evolution collisional systems. This study reveals timing Variscan processes Saxothuringian wedge, reflecting transition from oceanic continental subduction and collision. In situ monazite U-Pb Rare Earth Elements (REE) geochemistry were performed Erzgebirge Crystalline Complex on phyllites micaschists surrounding ultra-high-pressure (UHP) core dome. resulting ages REE patterns linked individual tectonometamorphic events revealed that hanging-wall experienced prograde metamorphism around ∼350 Ma, followed by exhumation at ∼345–340 Ma. oldest age (∼339 Ma) recorded garnet cores foot-wall is considered as upper limit for their metamorphism, while matrix ∼330 Ma reflect a significant resetting system. Spatial distribution metamorphic isograds indicates phase accretion material inverted field gradient wedge between ∼360 ∼340 was portion buoyant subducted leading massive ductile thinning ∼335 Finally, late intracontinental deformation responsible heterogeneous reactivation final It newly shown can be divided into younger inner part, formed UHP rocks, older outer phyllites.