K-rich plutonic rocks and lamprophyres from the Meissen Massif (northern Bohemian Massif): Geochemical evidence for variably enriched lithospheric mantle sources

K-rich plutonic rocks and lamprophyres from the Meissen Massif (northern Bo hemian Massif) intruded at about 330 Ma in the Elbe Zone. The plutonic comp lex consists of about 50 % gabbroic to mainly monzonitic rocks and of about 50 % granites. The gabbroic to monzonitic rocks are characteristic of the shoshonitic suite in their strong enrichment in LILE and LREE and a relativ e depletion of HFSE. The slightly silica-undersaturated gabbroic rocks (SiO 2 <50 wt.%) with Sr-87/Sr-86((330Ma)) ratios of 0.70479 to 0.70509 and epsi lon(Nd(330Ma)) of -0.9 to -1.7 are interpreted to be mainly composed of mel t components from subduction-modified parts of the continental lithospheric mantle (CLM). Mixing and AFC modeling show that contamination of asthenosp heric basalt neither by upper crustal gneiss nor by hypothetical Sr-Ba-rich mafic lower crust can reproduce the isotope and trace element patterns of the gabbroic rocks. The monzonites (SiO2>53 wt.%) crystallized mainly from a more differentiated, more enriched magma pulse. Additionally, the monzoni tes are affected by crustal contamination including mechanical entrainment of zircon and apatite. Similar epsilon(Nd(330Ma))-values of the majority of the gabbroic to monzonitic rocks and a kersantite demonstrate that these r ock types can be derived from similar sources probably enriched by subducti on of oceanic crust. In contrast, associated minette dikes originated from CLM sources with evolved Sr-87/Sr-86((330Ma)) ratios of 0.70686 to 0.70738 and epsilon(Nd(330Ma)) of -4.1 to -4.3. The most primitive minette sample w ith the lowest Nh content is most enriched in Th (91 ppm) and U (23 ppm) wh ich is typical for K-rich rocks from CLM modified by subduction of upper co ntinental crust. Upper Devonian/Lower Carboniferous subduction and collisio n processes are thought to be responsible for the formation of variably enr iched CLM domains from which the several K-rich Meissen magmatic rocks were extracted about 20 Ma later. Melt formation and intrusion are directly rel ated to strike-slip along the Elbe Zone.