Palaeoproterozoic orogenic evolution of the Fennoscandian Shield at 1.92-1.77 Ga with notes on the metallogeny of FeOx-Cu-Au, VMS, and orogenic gold deposits

摘要

A plate tectonic model for the evolution of the Fennoscandian Shield at 1.92-1.77 Ga is presented. The model involves Archaean cratonic units, >2.0 Ga microcontinents, pre-1.92 Ga island arcs, and 1.90-1.83 Ga arcs that accreted to form the Fennoscandian Shield. The complex evolution is divided into five orogenies and involved a microcontinent accretion stage, a continental extension stage, a continental collision stage, and an orogenic collapse and stabilization stage. Notes on the metallogeny of FeOx-Cu-Au, VMS, and orogenic gold deposits developing at this time period are also given.