Weak compositional zonation in a silicic magmatic system: Incesu ignimbrite, Central Anatolian Volcanic Province (Kayseri - Turkey)

Variation of several major oxide concentrations (Fe2O3, TiO2, CaO and K2O), trace element concetrations (V, Sr, Cs and Rb) and trace element ratios (Ba/Rb, Sr/, K/Sr, K/Nb, Rb/Sr, Rb/Y and Rb/Nb) versus SiO2 concentration show the magma chamber that generated the Incesu ignimbrite was compositionally zoned. All geochemical and Sr-Nd isotpic datas can be interepreted to be the result of a subduction related source.