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Crustal source of the Late Cretaceous Satansari monzonite stock (central Anatolia - Turkey) and its significance for the Alpine geodynamic evolution

2013    Koksal, Serhat; Toksoy-Koksal, Fatma; Goncuoglu, M. Cemal; Moeller, Andreas; Gerdes, Axel; Frei, Dirk

The Late Cretaceous granitic rocks within central Anatolia (Turkey) not only date and show the magmatic aspects of the Alpine realm, but also give clues about its geodynamic character. Among them, the Satansari monzonite stock (SMS), part of the Terlemez pluton (Aksaray), characterizing the inception of an extensional tectonic regime in central Anatolia, has a subalkaline, metaluminous and magnesian geochemical nature with depletion in Ba, Nb, P and Ti, and with enrichment of Th, U, K and Pb relative to primitive mantle. The SMS has LREE enriched patterns ([La/Yb](N) = 8.45-21.21) with moderately negative Eu-anomalies ([Eu/Eu*](N) = 0.65-0.73). The geochemical data infer a crustal source with an inherited subduction-related component, and fractionation of plagioclase and amphibole. A crustal signature for the SMS is also inferred from high Sr-87/Sr-86((t)) ratios (0.70826-0.70917), and low epsilon Nd-(t) values (-6.9 to -7.6).