Petrogenesis of the late Cretaceous Turnagol intrusion in the eastern Pontides: Implications for magma genesis in the arc setting

Abstract

A series of Cretaceous plutons is present in the eastern Pontides of northeastern Turkey. The Turnagol intrusion is the least studied and, thus, the least understood plutons in the orogen. This intrusion consists of hornblende-biotite granodiorites emplaced at 78 Ma based on LA-ICP-MS U-Pb zircon dating. It is of subalkaline affinity, belongs to the medium- to high-K calc-alkaline series, and displays features typical of I-type granites. The rocks of the intrusion are enriched in large-ion lithophile elements and light rare earth-elements with negative Eu anomalies (Eu/Eu* = 0.69-0.82), but are deficient in high-field-strength elements. They have a small range of (Sr-87/Sr-86)(i) (0.7060-0.7063), epsilon(Ndi)(-2.6 to -3.1), and delta O-18 (+8.1 to +9.1) values. Their Pb isotopic ratios are Pb-206/Pb-204 = 18.63-18.65, Pb-207/Pb-204 = 15.62-15.63, and Pb-208/Pb-204 = 38.53-38.55. The fractionation of plagioclase, hornblende, and Fe-Ti oxides had key functions in the evolution of the Turnagol intrusion. The crystallization temperatures of the melts ranged from 758 to 885 degrees C as determined by zircon and apatite saturation thermometry. All these characteristics, combined with the low values of K2O/Na2O and (Na2O + K2O)/(FeOt + MgO + TiO2), as well as the high values of (CaO + FeOt + MgO + TiO2), suggest an origin by dehydration melting from a metabasaltic lower crustal source. (C) 2012, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.