## 4 Results
### Ternary and Discriminant Diagrams Based on Major Oxides  
The samples from the Tunjice Hills are arranged on the left side of the A-CN-K triangular plot and show a linear trend subparallel to the A-CN junction (Figure 7). The Sarmatian samples have the highest average of Al\({}_{2}\)O\({}_{3}\) content, while the Early Miocene samples have the lowest average of Al\({}_{2}\)O\({}_{3}\) content. The samples were uniformly distributed subparallel to the A-CN joint. The diagram shows the greatest agreement with the weathering trends of tonalite and granodiorite. The average CIA (chemical index of alteration) value is 53.55 for the Early Miocene samples, 60.08 for the Badenian samples, and 78.03 for the Sarmatian samples. The lowest and highest CIA values come from the Early Miocene samples, with 13.6 being the lowest and 94.8 the highest. Figure 6: Geochemical classification of the Tunjice Hills sedimentary rocks using log (SiO\({}_{2}\)/Al\({}_{2}\)O\({}_{3}\)) versus log (Fe\({}_{2}\)O\({}_{3}\)/K\({}_{2}\)O), after [PERSON] [69]. Figure 7: Molecular proportions of the A-CN-K ternary diagram [65] for the sedimentary rocks in the Tunjice Hills. According to the discriminant function diagrams of [PERSON] and [PERSON] [66], the majority of the Early Miocene samples in the first diagram (Figure 8a) can be assigned to the intermediate field, two samples to the recycled, and one to the mafic field. In the second diagram (Figure 8b), the majority of the samples plot into the recycled field--one to the mafic field and one to the felsic one. The samples that plot into the mafic field are not identical in both diagrams. The Badenian samples are in the recycled and intermediate provenance fields in both diagrams, but in the second diagram (Figure 8b), many samples lie on the border between intermediate and recycled fields. Most of the Sarmatian samples fall into the recycled field in the first diagram and in the second diagram (Figure 8b), similar to the Badenian samples, into the boundary between intermediate and recycled provenance. Two samples from the Sarmatian fall into the mafic field. While the first diagram shows a tendency to assign the younger sediments to the recycled field and the older ones to the intermediate field (Figure 8a), the samples in the second diagram (Figure 8b) show no characteristic contribution. The Al2O3/TiO2 ratio of the Early Miocene samples is 28.19. The Early Miocene samples contain two samples with ratios greater than 80, which increases the ratio. Excluding these two samples, the Al2O3/TiO2 ratio is 21.79. The ratio of the Badenian samples is 18.26 and 16.41 for the Sarmatian samples. The majority of Early Miocene and Badenian samples in the discriminant diagram of SiO2 versus log (K2O/Na2O) after [PERSON] and Korsch [66] plot into the oceanic island arc setting, and the majority of Sarmatian samples plot into the field of active continental margin setting (Figure 9). Based on [PERSON]'s [68] tectonic discriminant function of major elements, all three sample groups are unevenly distributed, and based on the ratio of TiO2 and Fe2O3 + MgO (Figure 10a), are predominantly placed in the active continental margin and continental island arc region. Based on the ratio of Al2O3/SiO2 and Fe2O3 + MgO, most samples plot in the field of the continental island arc and the active continental margin field (Figure 10b). Individual samples lie within the oceanic island arc and passive margin. The majority of samples in both diagrams plot outside of any field (Figure 10a,b). Figure 8: Discrimination diagrams for the provenance signature of the Tunjice Hills sedimentary rocks using major oxides (**a**) and the ratios between major oxides (**b**) after Roser and Korsch [66]. The legend of the samples is shown in Figure 7.  
Slightly different results in determining the tectonic setting are provided by the low- and high-silica diagrams of Verma and Armstrong-Altrin [3].