TECTONO-STRATIGRAPHIC COMPLEXES AS THE LARGEST UNITS IN THE PALEOPROTEROZOIC OF THE UKRAINIAN SHIELD

Abstract

The main problems of stratigraphic taxonomy and no menclature of Paleoproterozoic metamorphic formations of the Ukrainian Shield are characterized by the example of the Kryvyi Rih (Kryvyi Rih-Kremenchuk), Ingulets (W-Ingulets) and Ingul structural-formation zones. In addition to the existing stratigraphic units of regional rank — series — the relevance of identifying supra-regional tectono-stratigraphic structural-material complexes, which have cardinal differences in geotectonic and paleogeographic conditions of formation and formational paragenesis, is shown. The most general features of the evolution of sedimentary lithogenesis in the Paleoproterozoic of the Ukrainian Shield are shown in terms of identifying two tectono-stratigraphic structural-material complexes of supra-regional rank: 1) Krivorozhsky (subplatform with a relatively poorly differentiated type of epeirogenic movements, subhumid, ma - ture — with a high level of chemical weathering, characterized by close paragenesis of five formational types of sedi - ments — monoquartz and oligomictic metapsephopsammites ↔ high-aluminous metaaleuropelites ↔ aluminous carbonaceous metaaleuropelites ↔ terrigenous-carbonaceous shales and metadolomites ↔ ferruginous quartzites and shales; 2) Ingulsky or Ingulsko-Gleyevatsky (tectonically active, resembling Phanerozoic myogeosynclinal or marine trough complexes, subarid, immature — with a low level of chemical weathering, carbonate-terrigenous metaflichoid subgrawacke). Typomorphic features of the structure and formational content of the identified complexes are considered and their correlation with similar complexes on other shields is indicated; attention is drawn to their correspon - dence to the stratigraphic rank of “Supergroups”.