TITLE:
The Influence of an Interdependent Structures on the Post-Mesozoic Evolution of the Eastern Flank of the Mongol-Okhotsk Orogenic Belt
AUTHORS:
Inna Derbeko
KEYWORDS:
Mongol-Okhotsk Orogenic Belt, Magmatism, Late Mesozoic, Subduction, Collision, Tectonic Events
JOURNAL NAME:
International Journal of Geosciences,
Vol.13 No.6,
June
24,
2022
ABSTRACT: Based on the analysis of known geodynamic models that explain the
processes in various geodynamic settings of the Meso-Cenozoic stages of the
development of continental margins and the tectonic-magmatic events
accompanying these processes, as well as on the basis of our own data obtained
as a result of many years of research on the axial structure of the Central
Asian Fold Belt-Mongol-Okhotsk orogenic belt and the
influence of interdependent structures on the post-Mesozoic evolution of the
eastern flank of the Mongol-Okhotsk orogenic belt was substantiated by us. The
closure of the Mongol-Okhotsk basin due to the approach of the Siberian and
North China cratons was accompanied by a change in geodynamic conditions:
subduction, collision, intraplate-rift and was reflected in the formation of
synchronous igneous complexes in the frame of the Mongol-Okhotsk orogenic belt.
In the northern frame of the belt, the distribution of magmatites is cut
off by the structure of the Selenga-Stanovoy superterrane in the west. The
northern boundary of the superterrane is the zone of the Dzheltulak fault. In
the south, it borders on the Mongol-Okhotsk orogenic belt along the zone of tectonic melange. We
believe that evolutionary processes within the orogenic belt and its framing
continued into the post-Mesozoic time after the final formation of the belt as
an orogen. The position of the Selenga-Stanovoy superterrane in the late
Mesozoic did not correspond to the modern one. The structures of the Central
Asian fold belt located between the Mongol-Okhotsk orogenic belt and the
Siberian craton in the Cenozoic were influenced by collisional processes
occurring between the Indian and Eurasian plates. And these processes were not
only the “driving force” for the movement of the Selenga-Stanovoy superterrane
in the post-Mesozoic time, but also changed the structure of the Mongol-Okhotsk
orogen, dividing it into two flanks.