Central Type Structures of South Sikhote-Alin in Probabilistic Gravity Models: Deep Structure, Rheology, Hierarchy, Fractality, and Metallogeny

Abstract

The relationships of ore districts, clusters, and fields with hierarchal subordinate central-type structures of three taxonomic levels are established from an analysis of the 3D distributions of contrast density in the crust of South Sikhote-Alin. The possible occurrence depth of fluid-magmatic sources of ore mineralization is determined from the coincidence of ore mineralization halos with the projections of deep density heterogeneities: Sn (2–6 km), Sn–polymetallic (4–12 km), polymetallic (6–20 km), and Au–W (14–24 km). The spatial location of central-type structures and related ore mineralization halos coincides with viscous shear zones, which exhibit sagging of the upper crustal level (Samarka Terrane, Kavalerovo district, and Soboliny ore cluster) and the displacement of contours of density heterogeneities in various deep sections (Dalnegorsk district). The deep boundaries of ancient continental crust and Mesozoic island-arc wedges, which are underthrust beneath accretionary–fold complexes, are determined. The combination of these structures is characterized by evident features of a transform strike-slip fault.