A. E. Eskin1, S. G. Skolotnev1, N. V. Tsukanov2

1 Geological institute RAS, Moscow, 109017
2 P.P. Shirshov Institute of Oceanology RAS, 117997 e-mail: paleogeo@sio.rssi.ru

The new data on mineral composition and geochemistry of Andrianovsky Pluton located in Upper Cretaceous island arc complexes of Tumrok Range were obtained. The comparison of petrographic and petrochemical features, rare earth elements content and rock-forming minerals composition shows that it has complicated evolution history. The data obtained justify that the mother melt of Pluton rocks has island arc nature. The lower and middle parts of the massif composed by dunites, vehrlites and gabbroic rocks have originated from the depleted tholeiitic melts. The gabbro-syenites from upper part of the section represent the crystallized high-differentiated residual melt and were formed from sub-alkaline melts.