Структурно-вещественные особенности рудного поля «Глухое» в контексте эволюции Журавлёвского террейна (сихотэ-алинь)

Abstract

the structure of the ore field of the gold ore deposit “Glukhoe” is considered. Its key feature being terrigenous monomictic melange. Its texture peculiarities are the evidence of volumetric non-unidirectional plastic flow of tectonically disintegrated terrigenous material mainly along the large fault disturbance (Kulishov fault), that goes through the whole area under investigation.The formation of melange took place in conditions of dominating compression accompanied by formation of tectonic debris contained in the finely ground mass having fluidal texture. This compression is responsible for thrust-shift deformations which the pumping of finely shattered material is conditioned.The relation between shift and scale-thrust dislocations allows to suppose synshift character of the latter as the result of trans-pressive kinematics. This is confirmed by the orientation of scales in the northeastern part of the area under investigation as well as by distinct tendency to echelon-like counter-clockwise displacement of scales surfaces in the zone to the north of Kulishov fault.Dominating orientation of the axes of tectonic debris confirms shift character of Kulishov fault, with jump-down component being practically excluded.Analysis of the ore field of the deposit “Glukhoe” and its comparison with the existing models of the Zhuravlev terrane formation mainly agrees with the mechanism of oblique subduction, that leads to formation of left-shift deformation.Melange substrate is a good permeable material for granitoid melts and in particular for ore-bearing solutions. Ore process conditioned by quartz-carbonate metasomatosis takes place in a multistage manner for a long period of time subsynchronously with the formation of melange at its final stage. This is confirmed by both disintegration of bodies subjected to quartz-carbonate volumetric metasomatosis and superimposition of regeneration processes in the vein variant.