Magmatic history and geophysical signature of a post-collisional intrusive center emplaced nearby a crustal-scale shear zone: the Plechy granite pluton (Moldanubian batholith, Bohemian Massif)
Abstract
The Plechý pluton, south-western Bohemian Massif, represents a late-Variscan, complexly zoned intrusive center emplaced near the crustal-scale Pfahl shear zone; the pluton thus provides an opportunity to examine the interplay among successive emplacement of large magma batches, magmatic fabric acquisition, and the late-Variscan stress field associated with strike-slip shearing. The magmatic history of the pluton started with the emplacement of the the porphyritic Plechý and Haidmühler granites.
Based on gravity and structural data we interpret that the Plechý and Haidmühler granites were emplaced as a deeply rooted, ~NE–SW elongated body; its gross shape and internal fabric (steep ~NE–SW magmatic foliation) may have been controlled by the late-Variscan stress field.