Lower crustal rejuvenation and growth during post-thickening collapse: Insights from a crustal cross section through a Variscan metamorphic core complex

Abstract

The Variscan lower crust of Europe acquired its main features (seismic layering, intrusion of mantle-derived magmas, granulite-grade metamorphism) when the upper crust underwent post-thickening extension through gravitational collapse. We suggest that post-thickening collapse is a geodynamic process that contributes to the growth and differentiation of continental lithosphere in collapsed mountain belts.