Introduction of the Stanovsky ophiolites of Faddesky block of Northeasten Taimyr according to geological data and numerical modeling results

Abstract

The geological position, morphology of serpentinite bodies, limitation by faults, the presence of surrounding metamorphites as enclosing strata fragments within the Stanovsky ophiolite complex, the nature of metamorphism, high deformation of rocks of both ophiolites and contact zone strata, and the mineral parageneses of secondary transformations fully correspond to the signs of Stanovsky ophiolites introduction into the deeply metamorphosed Faddeevsky block strata of Northeastern Taimyr, and not their obduction. The modeling results showed that fragments of the oceanic crust introduced into the metamorphosed complexes of the continental crust during the collision can have a dual origin — from the primary oceanic crust, and from the newly formed crust of the back-arc basin. A detailed chemical composition analysis of the Stanovsky ophiolites indicates their formation in the suprasubduction setting of the back-arc basin, which justifies the possibility of the second scenario.