Convergent Processes in the Evolution of the Early Caledonian Bayan-Khongor Zone of Central Asia: Evidence from Geological and Geochronological Investigations of the Khan-Ula Gabbroid Pluton

摘要

The formation of the Caledonian accretional-col-lisional area of the Central Asian Fold Belt (CAFB) is controlled by the processes of Early Caledonian tec-tonogenesis. In the range of 570-490 Ma, these processes resulted in the formation of the Caledonian superterrain comprising the fragments of continental massifs located within the Paleoasian Ocean, as well as Late Riphean and Vendian-Early Paleozoic oceanic and island arc structures [1]. The Bayan-Khongor ophiolite zone (BKZ), the largest structure in Asia, which reconstructs the first stages of Caledonian tec-togenesis most completely, is one of the key structures of the superterrain.