| Abstrakt: |
Two principal types of post-Variscan lamprophyres occur in the Bohemian Massif, contrasting in their age and composition, namely the ultramafic lamprophyres of Late Cretaceous to Paleocene age and the alkaline lamprophyres of Mid Eocene to Late Oligocene age. The mineral geochemistry, trace element distribution and Sr-Nd isotope variations of UMK field are typical for group I kimberlites. Graph Potassium-rich rocks, including lamprophyres, lamproites, orangeites and kimberlites, form a fascinating group of volatile-rich igneous group that occur in diverse tectonic regimes. [Extracted from the article] |
