611220

Petrogenesis of (ultra-)potassic magmas in the European Variscides – implications for development of collisional orogens and crustal growth models

Deep subduction and relamination of felsic continental crust rich in radiogenic elements have far-reaching consequences for the thermal state and rheology of the orogenic lithosphere as well as mantle enrichment processes. The project proposes an integrated study of petrology, geochemistry and Sr–Nd–Pb–Li–O–Mg–Cr isotopic systems in Early Carboniferous ultrapotassic plutons, related to deep subduction of continental crust, in Bohemian Massif, French Massif Central and Vosges. This study should provide pivotal information about mantle and crustal sources of parental magmas in the Variscan orogenic root (Moldanubian Zone) and their further evolution. In turn, these data represent a key input into any large-scale model aimed at explaining the geotectonic development of the European crust and lithospheric mantle. More importantly, the proposed research should improve our understanding of the nature and genesis of ultrapotassic magmas with peculiarly mixed mantle–crustal signatures, as well as the general geotectonic development of younger collisional orogens, e.g. Andes or Himalayas.

Project manager: prof. Mgr. Vojtěch Janoušek, Ph.D. Duration of the project: 01.01.2018–30.06.2021