STRUCTURAL INTERPRETATION OF GABBROIC ROCKS IN AGACOREN GRANITOID, CENTRAL TURKEY - FIELD OBSERVATIONS AND AEROMAGNETIC DATA

Gabbroic rocks crop out commonly in different localities of the Centra l Anatolian Crystalline Complex and are interpreted by many researcher s as the remnants of a Neotethyan ophiolitic suite now observed as roo f-pendants in the granitoids of the complex. In this study, the struct ural position of the gabbroic rocks within one of the granitoids of th e Central Anatolian Crystalline Complex, namely the Agacoren Granitoid , is determined by geological and aeromagnetic data from the central p art of the pluton. The gabbroic rocks have sinuous contacts with the A gacoren Granitoid and they display a gradual change in composition and texture from gabbro at the top of the hills to diorite at the foot of the hills towards the contact with granitoid. Power spectra, high-and low-pass filtered aeromagnetic and pseudogravimetric anomalies were p roduced using geophysical methods. A two-dimensional model constructed from the high pass-filtered anomalies, with the control of the in sit u susceptibility data and the low-pass filtered anomaly, suggests exis tence of a shallow conical-shaped and deeply buried gabbroic body. The deep body extends down to deeper levels of the upper crust and, given the textural and compositional features which suggest magma mixing, i s interpreted as an intrusion coeval with the Agacoren Granitoid.