Mineral chemical constraints on the petrogenesis of mafic and intermediate volcanic rocks from the Erciyes and Hasandağ volcanoes, Central Turkey

Mantle source heterogeneity in monogenetic basaltic systems: A case study of Eğrikuyu monogenetic field (Central Anatolia, Turkey)

“…Most of the olivine crystals in the Eğrikuyu monogenetic field basalts are not in equilibrium with the melt (Fig. 7A; i.e., outside of K D = 0.30 ± 0.03), which has also been reported for some Central Anatolian volcanic province basalts (e.g., Köprübaşı et al, 2014), suggesting that olivine crystals either formed as accumulated xenocrysts or crystallized in evolved magmas. However, some of the olivine crystals in Eğrikuyu monogenetic field basalts only plot below the equilibrium boundary (Fig.…”

“…Olivine core composition in the alkali Eğrikuyu monogenetic field basalts ranges between Fo 64 and Fo 89 (Fo = 100 × Mg/[Mg + Fe T ], where T is total iron), whereas the range is Fo 70 -Fo 90 in transitional Eğrikuyu monogenetic field basalts (Table 2; Supplemental Data [footnote 1]). Fo contents of Eğrikuyu monogenetic field basalts are also similar with those of the Central Anatolian vol canic province basalts (Aydar et al, 1995;Aydin, 2008;Köprübaşı et al, 2014). The olivine phenocrysts are essentially unzoned, or normally zoned with decreasing Fo content toward the rim (Fig.…”

“…Most of the plagioclases in the Eğrikuyu monogenetic field basalts is labradorite and bytownite in composition, similar to other Central Anatolian volcanic province basalts ( Fig. 7B; Aydar et al, 1995;Aydin, 2008;Köprübaşı et al, 2014;Doğan-Külahçı et al, 2018). Plagioclase crystals of the Eğrikuyu monogenetic field basalts generally display normal zoning (Figs.…”

“…According to Morimoto (1988), Cpx is mainly diopsidic and rarely augitic in composition (Wo 38-45 En 40-48 Fs 9-21 in TB, and Wo 42-50 En 36-49 Fs 6-19 in AB), similar to other Quaternary Central Anatolian volcanic province basalts ( Fig. 8A; Aydar et al, 1995;Aydin, 2008;Köprübaşı et al, 2014;Doğan-Külahçı et al, 2018) and Pliocene Sivas basalts (Kocaarslan and Ersoy, 2018). Cpx is generally ferroan diopside (Fe 2+ >0.1; Morimoto, 1988) with subordinate ferrian alumina diopside or fassaite (Fe 3+ >0.1; Morimoto, 1988).…”

Transport of Volatile-rich Melt from the Mantle Transition Zone via Compaction Pockets: Implications for Mantle Metasomatism and the Origin of Alkaline Lavas in the Turkish–Iranian Plateau

“…Finally, we discuss the link between these CPs and the observed distribution and chemical composition of the alkaline volcanism (< ~11 Ma); we show that large an area of 300 × 20-25 km and its magmatism is characterized by mostly mafic to intermediate calc-alkaline to alkaline lavas (i.e. Hasandagh and Erciyes volcanoes) (Temel et al, 1998;Aydin et al, 2014;Köprübasi, et al, 2014) with only few tholeiitic lava outcrops around the Hasandagh volcano (Köprübasi et al, 2014). However, there are no systematic relationships between magmatic composition and time.…”