Late-orogenic Variscan magmatism: the case of quartz monzodiorite dykes from Blanice Graben, southern Bohemia

Abstract

All these late Variscan (Permian) basic-intermediate magmas seem to have intruded in extensional regime, following the orogenic collapse. The attendant crustal thinning could have led to upwelling and adiabatic decompression melting of the local, by the Late Devonian-Early Carboniferous subduction-modified, lithospheric mantle.

Keywords

• quartz monzodiorite
• petrology
• geochemistry
• petrogenesis
• Bohemian Massif
• Variscides