Geophysical Journal | 2001 volume 23 6

Late-devonian crustal extension as one of the factors of the formation of the inhomogeneities in the crystalline rocks of the marginal parts of the Dnieper-Donets Basin

© S.N. Stovba, Y.P. Maistrenko

The formation of inhomogeneities in the crystalline rocks of the basement of the near marginal areas of the Dnieper-Donets basin (DDB) is explained by geological processes that occurred near the disjunctive disturbances during their formation at the tectonically active stages of the basin evolution. One of the main stages of the active formation of such inhomogeneities might be the rift stage that lasted in the Late Devonian in the DDB and, according to the performed analysis of the geological and geophysical data, could notably influence the tectonic structure of the marginal parts of the basin. For oil and gas search even zones of ruptures where the movements were not renewed as late as in post-devonian time can be promising. Such faults and ruptures could be the ways of the migration of hydrocarbons and the inhomogeneities formed in the basement rocks near them could be filled with oil and gas simultaneously with the formation of presently known deposits within the northern edge. It is recommeded to expand the exploration in the near-marginal zones of the DDB where both subsult devonian deposits and the crystalline basement rocks may be promising. The basis of this fact may be the similarity of the history of the formation of oil and gas promising structures within the marginal and near-marginal zones.

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