Petrological investigation of saricakaya (Eskisehir) magmatic complex

The study area is located around Saricakaya, Mihalgazi and Inhisar settlements in the north of Eskisehir province and covers an area of approximately 150 km2 within the Sakarya Zone. Main magmatic rocks observed in the study area; Sarıcakaya Magmatic Complex (SMK) is composed of gabbro, diorite, granodiorite and pegmatite / aplitic rocks. Mafic microgranular enclaves (MMA) are obseverd separated from the main rock by sharp contact, darker and finer grain, sizes ranging from 1-10 cm, in the diorite and granodiorites of SMK. Whole rocks geochemical data show that, in study area are subalkalen in composition and show calc-alkalen trend in AFM diagram. Due to % K2O values, SMK show K series shoshonitic character, while SMK units show mid calcalkalen charecter. Patterns obtained from ORG normalized trace element spider diagrams show that all SMK units show enrichment in LIL elements and show partial depletion of HFS elements. When the main and trace element oxide exchange diagrams of all rock groups to SMK are examined, it could be said to occur by fractional crystallization from magma / magma, which are related to each other originally. The age of the magmatic units in the study area was determined as with U - Pb radiometric aging and between 321,3±1,2 My –323,62±0,86 My. SMK samples are the Y/Nb ratios between 1,02-3,62 and the Nb/Ta ratio between 4-13 and these ratios show mantle-lower crust interaction of this magmatism. According to all this information, when analyzed rocks of SMK from petrographic, geochemical, petrological and geochronological, according to the proposed geodynamic model, it is thought that SMK is formed by the arc granitoid magmatism which occurs in the subduction zone towards the south of Paleotethys in the Late-Early Carboniferous. Keywords: Eskişehir, Sarıcakaya magmatic complex, Petrology, Geochronology.