System organization of consolidated basement’s disjunctive tectonics in Dnipro-Donets paleorift. Part 1. Lineaments

Abstract

The article presents the character occurence study results of rocks meso-fracturing planetary system in the Dnipro-Donets paleorift crystalline basement (DDP). It has statistically consistent spatial net orientation, unchangable under further transformations of geodynamic field tensions in the earth's crust and serves as a primary grid for formation of any type and rank within the geostructures. Statistical analysis of azimutal planetary net array in the crystalline basement of DDP on the cartographic and circle rose-diagrams was carried out. By its results six pairs of mutually orthogonal fracture systems diagnosed as regional fault system were identified. Paragenetic and Kinematic analysis of identified regional fault systems using field data of tectonophysic study of similarly oriented transregional faults on the adjacent geostructures – Ukrainian Shield, Voronezh anteclise, Donetsk folded structure was carried out. As a result of the analysis four genetic types of structure paragenesis was identified, which correspond to four main geodynamical conditions of tectonic deformations found in the region. Among them two regional structure-forming rift parageneses developed in the north-western diagonal fault system in azimuths were identified. By the results of carried out reconstruction of main axis of tensors paleotension fields’ characteristics of spatial-time realization on the DDP planetary regmatic grid and field of geodynamical tensions of earth-crust were identified. These data made the model base for systematic organization of consolidated region’s basement fault tectonics. Results of carried out study has allowed to establish: 1. regional shift mechanism of system tectonic faults activation in the crystalline basement, resulting in formation of four main regional structure types of paragenesis, determining main traits of system basement architecture organization. 2. Spatial-time parameters of one-directional process of paleotension field inversion: shift of main compression and decompression axis performed counter-clockwise with azimuthal period-15 per one geological stage that has led to its summarized shift on 60 in the phanerozoic geotechnology. 3. geotectonic regularity of geodynamical evolution of earth-crust DDP, consisting in the formation of four main regional-structure plans in the structure of sedimentary sheath: 1) paleozoic 2) paleozoic-mezozoic 3) mezozoic-cenozoic 4)recent cenozoic, which is on the formation stage. Overall study results in the formalized view are presented by the scheme of the earth-crust geodynamic evolution of DDP.