Petrogenesis of the Eocene post-collisional alkaline volcanism in Meshginshahr, NW Iran

Zircon U–Pb ages, geochemical and Sr–Nd–Pb–Hf isotopic constraints on petrogenesis of the Tarom-Olya pluton, Alborz magmatic belt, NW Iran

“…Such a model may be considered for the origin of the Tarom-Olya shoshonitic pluton, which shares common geochemical and isotopic characteristics with other Eocene-Oligocene high-potassium and shoshonite plutonic bodies along the Alborz, Azerbaijan and Eastern Pontides (Turkey) regions (Aghazadeh et al, 2011;Castro et al, 2013;Karsli et al, 2012;Nabatian et al, 2014). In addition to plutonic bodies, there is a huge volume of Eocene basic and intermediate volcanic rocks in the Alborz and Azerbaijan districts which show high-K to shoshonitic affinities (Verdel et al, 2011;Asiabanha and Foden, 2012;Nabatian et al, 2014;Zamani et al, 2015). Derivation of the Tarom-Olya pluton from an enriched subcontinental mantle is furthermore supported by the whole rock Nd-Sr (ε Nd(t = 36 Ma) = 0.39 to 2.10 and 87 Sr/ 86 Sr i(t = 36 Ma) = 0.7047 to 0.7051) isotopic signatures well within the range of the shoshonitic mantle-derived mafic magmas (Asiabanha and Foden, 2012;Dabiri et al, 2011;Eyüboglu et al, 2011;Tommasini et al, 2007;Turner et al, 1996).…”