The Kozak Pluton and its emplacement

The Kozak pluton is located in central western Anatolia, where it crops out in the core of an antiformal culmination. The pluton was emplaced into reg ionally deformed and metamorphosed basement rocks, during the Late Oligocen e-Early Miocene period. The pluton consists mainly of a homogeneous granodi orite with fine-grained margins. A suite of hypabyssal intrusives of the sa me composition formed a fringe around the pluton, during the late phases of emplacement. The hypabyssal rocks are intimately mixed with cogenetic volc anic rocks of Early Miocene age. Field evidence suggests that the pluton is a very high level intrusion, although it has features typical of more deep -seated granites. The pluton exhibits different effects on the host rocks a long different contacts, which suggests that during its long history of asc ent a variety of emplacement mechanisms operated at different depths. These emplacement mechanisms range from diapiric intrusion at deeper levels thro ugh cauldron subsidence to passive emplacement. During the latter phase, fa ults and fractures allowed the pluton to be finally emplaced at sub-volcani c levels. Copyright (C) 1999 John Wiley & Sons, Ltd.