Литосфера (Jan 2015)
Geologic structure and composition of Munilkan massif Verkhoyansk-Kolyma orogenic area
Abstract
This article presents the results of detailed study of geologic structure and composition of Munilkan massif of the Main batholith belt of Verkhoyansk-Kolyma mesozoides (Tas-Khayakhtakh Ridge). Granites include numerous xenoblocks of gabbro, dolerites and subvolcanic granites they are intruded by fissure bodies and dikes of leucogranites-alaskites and trachybasalts-trachydolerites and have neutral ratio with gabbro-diorites, diorites and monzonites, which were formed during interaction of basite and granite magma. Igneous activity occurred at some stages, from Oxfordian to the end of the Early Cretaceous (157-119 Ma). Composition parameters of magmatic rocks correspond to formation of early derivatives in island-arc conditions, late derivatives - in post-collisional and intraplate conditions, that is covers the entire cycle of geologic development of Verkhoyansk-Kolyma mesozoides.
