GEOBLOCKS IN THE BASEMENT OF ANCIENT CONTINENTAL PLATFORMS, THEIR INTERNAL DIVISIBILITY, AND METALLOGENY OF ORE DISTRICTS BASED ON GEOLOGICAL AND GEOPHYSICAL DATA

Abstract

We discussed the hierarchical block divisibility of the consolidated basement of continental platforms (from global to regional levels and the internal structure of high-order tectonic units) with the East European Platform (EEP) as an example.1 We outlined several versions of mechanisms suggested for the formation and evolution of lateral and vertical discreteness of basements of Katarchean, Early Archean, and Proterozoic, Riphean, Paleozoic, and Mesozoic plates and shields. The mechanisms were deduced from correlation of lithotectonic complexes in particular blocks and zones. Such correlation was based on the data of A.O. Schmidt (documentation of hundreds of outcrops of crystalline rocks in shields; geological mapping of territories in the Ukrainian Shield, Aldan Shield (western and central areas), and eastern Baltic Shield (Kola Peninsula, central and southern Karelia); examination of cores from deep boreholes that penetrated the basement, including the entire section of the Kola Superdeep SD-3; and interpretation of maps of potential fields with consideration of the available CDP data and all published DSS sections.