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.

The article presents a study to examine the geochronological and isotope geochemical characteristics of layered gabbros of the Khan-Ula Pluton. The study gathered Khan-Ula Pluton, a massif intruded by Late Paleozoic granites composed of layered gabbro, which is located from the southeastern part of Bayan-Khongor ophiolite zone (BKZ), which reconstructs the first stages of Caledonian tectogenesis. The data gathered allows to distinguish the Vendian stage in the development of the structural-material complexes of the BKZ. Decomposition and extraction of Zircon was measured on a mass spectrometer. It concludes that age estimation in the BKZ history contributes to the establishment of the convergence boundary origin and the end of its development within the ophiolite system.