PALEOGUYOTS OF THE DZHIDA ISLAND-ARC SYSTEM OF THE PALEO-ASIAN OCEAN: STRUCTURE, COMPOSITION, AGE, COMPARATIVE ANALYSIS WITH SIMILAR STRUCTURES OF THE CENTRAL ASIAN FOLD BELT, GEODYNAMIC MODELS

The Dzhidot and Urgol large paleoguyots and a number of smaller fragments of oceanic islands close in composition to the paleoguyots within the accretionary-collisional structures of the north-eastern part of the Central Asian orogenic belt are distinguished and described. Paleoguyots and their fragments form separate blocks of the oceanic crust in tectonic mélange as a part of large allochthons. Formation of paleoguyots occurred predominantly in the Ediacaran – beginning of the Early Cambrian in the oceanic environment under the influence of hot spots (mantle plumes). The oceanic crust containing paleogayots was subducted beneath the Dzhida island arc. The formation of the Dzhida paleoguyots and island arc took place at the same time intervas as similar formations of the Bayankhongor and Ozernaya zones of Western, Central Mongolia, East Tuva and Gorny Altay zones the Altay-Sayan region of the Central Asian Fold Belt.