Magma mingling textures in granitic rocks of the eastern part of the Strzegom-Sobótka Massif (Polish Sudetes)

Many granitic intrusions display evidence of magma mixing processes. The interaction melts contrasting composition may play a significant role during their generation and evolution. Strzegom-Sobotka massif (SSM), located in the Sudetes (SW Poland) north-eastern part Bohemian Massif Central European Variscides, exhibits mingling on macro- micro-scales. The massif is composite intrusion, with four main varieties: hornblende-biotite granite (with negligible amount of hornblende) biotite western part, two-mica granodiorite eastern part. Field for easily found granodiorite, where dark enclaves tonalitic composition occur. Enclaves range from few centimeters to half meter size, ellipsoidal to rounded shape. They occur individually homogeneous swarms. textures enclaves include fine-grained texture, acicular apatite, plagioclase xenocrysts, ocellar quartz blade-shaped biotite. most interesting feature presence numerous monazite-(Ce) crystals, including unusually large crystals (up 500 μm) which have grown close boundaries between and enclaves. crystallization monazite grains therefore be another, previously undescribed, form textural two contrasting magmas. microtextures may indicate that represent globules hybrid formed by more felsic host melt. Chemical dating yielded an age 297±11 Ma.