Miocene-Quaternary volcanism and geodynamic evolution in the Pannonian Basin and the Menderes Massif: A comparative study

Neogene volcanic rocks emplaced in the Pannonian Basin (PB) and Menderes Massif (MB) extensional basin systems share the same time interval and show some similarities in major and trace element geochemistry. In the PB, production of large volumes of rhyolites at similar to 22 Ma indicates an important crustal source region. Subsequently, large andesitic volcanism was derived from the mixing of magmas from both crustal/lithospheric mantle sources; further magmas, up to 11 Ma, have lower volumes and a lithospheric mantle origin. Overtime, the metasomatic components diminished in the lithosphere and this ultimately resulted in the eruption of magmas with a distinct asthenospheric character (intra-plate-related). At similar to 10 Ma, mixing of lithospheric and asthenospheric magmas resulted in the generation of transitional rocks, with basaltic and basaltic andesitic compositions. Intermittent, but continuous local generation of small volume Na-alkalic basalts at 12-10 Ma in the Styrian Basin and between 8 and 0.13 Ma in the central part of the PB, suggests a long period of small volume asthenospheric melt production via decompression melting