Geochemistry, Petrogenesis and Geodynamic Relationships of Miocene Calc-alkaline Volcanic Rocks in the Western Carpathian Arc, Eastern Central Europe

摘要: We report major and trace element abundances Sr, Nd Pb isotopic data for Miocene (16� 5^11 Ma) calc-alkaline volcanic rocks from the western segment of Carpathian arc. This suite consists mostly andesites dacites; basalts basaltic as well rhyolites are rare occur only at a late stage. Amphibole fractionation both high low pressure played significant role in magmatic differentiation, accompanied by highpressure garnet during early stages. Sr^Nd^Pb indicate crustal materials petrogenesis magmas.The parental mafic magmas could have been generated an enriched mid-ocean ridge basalt (E-MORB)type mantle source, previously metasomatized fluids derived subducted sediment. Initially, ponded beneath thick continental crust initiated melting lower crust. Mixing with silicic melts metasedimentary resulted relatively Al-rich hybrid dacitic magmas, which almandine crystallize pressure. The amount involvement decreased time thinned. A striking change source occurred about 13 Ma. later stages magmatism were more akin to FOZO. An upwelling plume is unlikely be present this area; therefore component probably resides heterogeneous upper mantle. Following magmatism, alkaline erupted that also asthenospheric source. propose types related some way lithospheric extension Pannonian Basin subduction indirect generation magmatism.The formed peak phase metasomatized, contaminated various materials, whereas post-extensional stage low-degree shallow asthenosphere. areas provide example long-lasting magma compositions changed continuously response changing geodynamic setting.