Publisher © Czech Geological Survey, ISSN: 2336-5757 (online), 0514-8057 (print)
Dolerites and gabbro to diorite porphyries in the Central Bohemian Plutonic Complex
Abstract
Conspicuous dyke swarms in the Central Bohemian Plutonic Complex of Variscan age comprise various lamprophyres dominated by minette, potassic melasyenite to melagranite porphyries, and much less frequent diabases or gabbro to diorite porphyries. Diabases are geochemically variable with a broad range of mg-numbers and trace element abundances. Significant differences in incompatible element-element ratios together with different strikes of dykes demonstrate that diabases belong to several generations originated from heterogeneous mantle sources. All the dykes display geochemical signature of magmatic arcs or subcontinental lithospheric sources with memory of previous supra-subduction processes.
