Alpine tectonic movements and salt tectonics of Eastern Ukraine
Abstract
Within Eastern Ukraine, in the course of previous studies, neotectonic movements were established, caused by both salt tectonics and Attic (post-Miocene - pre-Pliocene) thrust dislocations of northeastern vergence. They are partially displayed in modern relief.
The aim of the study was to reveal the structural results of the interaction of post-Pliocene fold-thrust deformations and modern salt tectonics of Eastern Ukraine.
Research methodology. The base of the Cenozoic deposits of Eastern Ukraine was chosen as an indicator surface reflecting both those and other movements. Its initial orientation is horizontal. Deviations from the horizontal reflect the direction and amplitude of deformations. The morphology of this surface was depicted by isolines with a vertical step of 20 m. To build a map of the supporting surface, state geological maps and data from more than 2,100 wells drilled in this area were used.
Research results. A map of the shape of the Cenozoic base in tectonic blocks between the Attic thrusts and beyond their development has been constructed. Uplifts of this surface, which are not associated with thrust movements, have been revealed. The dimensions of such uplifts are 8÷30 × 6÷15 km with vertical amplitude of 40 - 100 m or more. The uplifts are usually contoured by ring or arc compensation troughs a few kilometers wide and 20-100 m deep. Some of these uplifts are associated with the known salt domes of the area. Other uplifts do not contain such domes. It is possible that they formed over salt "pillows", which did not have enough salt reserves to form salt diapirs. The area of distribution of such uplifts approximately corresponds to the area of distribution of Devonian salt deposits at a depth of 5-10 km or more.
Scientific novelty. Neotectonic uplifts were discovered, similar in shape and size to those caused by salt tectonics, but located outside the areas of distribution of known salt-bearing strata. It is hypothesized that this is related to the older Hercynian overthrusts. The uplifts are located above the hanging blocks of the Hercynian overthrusts in the north and south of the study area. These thrusts were formed on the northern and southern sides of the former Dnieper-Donetsk depression during its destruction by the Hercynian folding. It is possible that the nappes over thrusts the Devonian salt-bearing deposits with metamorphic rocks of the crystalline basement. The decrease in the level of the World Ocean in the Quaternary period further increased the lithostatic load on the salt-bearing strata. This activated the isostatic upwelling of salt and the formation of gently sloping neotectonic uplifts.
Practical significance. These results clarify the geological structure of the territory and make it possible to expand the area of hydrocarbon prospecting.
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References
Aizenverg D.E., Berchenko O.I., Brazhnikova N.E. et al. (1988). Geologiya i neftegazonosnostʹ Dneprovsko-Donetskoy vpadiny. Stratigrafiya [Geology and oil and gas potential of the Dnieper-Donets depression. Stratigra-phy]. Kyiv, Naukova Dumka, 148. [in Russian]
Velikanov V.Ya. (2007). Geological map of Ukraine. Scale 1: 1000000. [in Ukrainian]
Kalinin V.I. (2007). Geological map of pre-Cenozoic formations of Ukraine. Scale 1: 1000000. [in Ukrainian]
Goryainov S.V. (1999). Ob alʹpiyskom uslozhnenii geologicheskoy struktury v razlichnykh regionakh Ukrainy [On the Alpine complication of the geological structure in various regions of Ukraine]. Reports of NASU, 8, 106-111. [in Russian]
Goryainov S.V. (2002). Tektonicheskiye osobennosti zony sochleneniya Donbassa i Voronezhskogo kristallicheskogo massiva [Tectonic features of the junction zone between the Donbass and the Voronezh crystalline massif]. Issues of development of the gas industry of Ukraine: a collection of scientific papers, 143-147. [in Russian]
Goryainov S.V. (2004). O protivorechiyakh geofizicheskoy modeli stroyeniya Dneprovsko-Donetskoy vpadiny [On the contradictions of the geophysical model of the structure of the Dnieper-Donetsk depression]. Visnyk of V. N. Karazin Kharkiv National University. Series "Geology-Geography-Ecology", 620, 19-21. [in Russian]
Goryainov S.V. (2004). O laramiyskom uslozhnenii geologicheskoy struktury v razlichnykh regionakh Ukrainy [On the Laramian complication of the geological structure in various regions of Ukraine]. Reports of NASU, 3, 92-95. [in Russian]
Goryainov S.V. Korenev V.V. (2007). Perekrestno-nadvigovaya struktura zony sochleneniya Donbassa s Priazovskim blokom Ukrainskogo shchita [Cross-thrust structure of the junction zone of the Donbass with the Azov block of the Ukrainian Shield]. Geology and issues of geological mapping and study of Precambrian formations of the Ukrain-ian Shield. Proceedings of the IV Scientific and Production Meeting of Geologists-Surveyors of Ukraine. Kryvyi Rih (Ukraine), 102-104. [in Russian]
Goryainov S.V., Aksenov S.V., Altukhov A.S., Vorobyov S.V., Isaeva E.P., Korenev V.V. (2009). Metamorficheskiye i metasomaticheskiye kompleksy Priazovʹya i Yuzhnogo Donbassa [Metamorphic and metasomatic complexes of the Sea of Azov and Southern Donbass]. Kharkov (Ukraine): Ecographer, 304. [in Russian]
Goryainov S.V. (2013). Kaynozoyskiye tektonicheskiye dvizheniya Vostochnoy Yevropy [Cenozoic tectonic move-ments of Eastern Europe]. Geology and minerals of the World Ocean, 3, 55-65. [in Russian]
Goryainov S.V. (2014). Pro budovu rozrizu paleozoyu Sentyanivsʹkoyi dilyanky za rezulʹtatamy burinnya hlybokoyi sverdlovyny Sentyanivsʹka-10 [On the structure of the Paleozoic section of the Sentyanivska area according to the results of drilling a deep well Sentyanivska-10]. Issues of development of the gas industry of Ukraine, 42, 1, 7-14. [in Ukrainian]
Goryainov S.V. (2014). Prostezhennya Novoho nasuvu parametrychnoyu sverdlovynoyu Ternivsʹka-677 [Tracing the New Thrust with a parametric well Ternivska-677]. Issues of development of the gas industry of Ukraine, 42, 1, 14-17. [in Ukrainian]
Goryainov S.V. (2014). Novi rezulʹtaty doslidzhennya hlybokym burinnyam heolohichnoyi budovy paleozoysʹkoho strukturnoho poverkhu Pivnichnoho Donbasu [New results of research by deep drilling of the geological structure of the Paleozoic structural surface of the Northern Donbass]. Issues of development of the gas industry of Ukraine, 42, 1, 17-21. [in Ukrainian]
Goryainov S.V. (2015.) Gertsinskiye tektonicheskiye dvizheniya Vostochnoy Ukrainy [Hercynian tectonic move-ments of Eastern Ukraine]. The latest problems of geology. Proceedings of the scientific-practical conference ded-icated to the 100th anniversary of the birth of V.P. Makridin. Kharkiv (Ukraine), 162–165. [in Russian]
Goryainov S.V. (2015). Alʹpiyskiye tektonicheskiye dvizheniya Vostochnoy Ukrainy, solyanaya tektonika i nefte-gazonosnostʹ [Alpine tectonic movements of Eastern Ukraine, salt tectonics and oil and gas potential]. The latest problems of geology. Proceedings of the scientific-practical conference dedicated to the 100th anniversary of the birth of V.P. Makridin. Kharkiv (Ukraine), 98–101. [in Russian]
Zakrzhevskaya I.G., Vysochansky I.V., Bordak L.A. (1992). Obobshcheniye geologo-geofizicheskikh materialov po parametricheskim skvazhinam: Zmiyevskoy № 602, Shurinskoy № 604, Lavrikovskoy № 606, Bespalovskoy № 671 na Zmiyevskom vystupe: otchet o NIR [Generalization of geological and geophysical materials for parametric wells: Zmievskaya No. 602, Shurinskaya No. 604, Lavrikovskaya No. 606, Bespalovskaya No. 671 on the Zmiev ledge: research report]. Poltava-Kharkov: UkrNIIgaz. [in Russian]
Kamaletdinov M.A., Kazantseva T.T., Kazantsev Yu.V., Postnikov D.V. (1991). Sharʹyazhno-nadvigovaya tektonika litosfery [Sharyazh-thrust tectonics of the lithosphere]. Moscow, Russia: Nauka, 255. [in Russian]
Kosmachev V.G., Kosmacheva M.V. (1993). Geologicheskaya baza "Kamenka". Uchebnoye posobiye [Geological base "Kamenka". Textbook[. Kharkov: KhSU, 104. [in Russian]
Stovba S.M. etc. (2003). Rehionalʹni seysmostratyhrafichni doslidzhennya mST na profili Starobesheve-Shakhtarsʹk-Luhansʹk (profilʹ DOBRE). Zvit po temi 113/00. [Regional seismostratigraphic studies of the MST on the profile Starobesheve-Shakhtarsk-Lugansk (profile DOBRE). Report on the topic 113/00].State Enterprise "Ukr-geofizika", TSOIGM: Kyiv. [in Russian]
Kruglov S.S., Gursky D.S. (2007). Tectonic map of Ukraine. Scale 1: 1000000. [in Ukrainian]
Yudin V.V. (2006). Tektonika Yuzhnogo Donbassa i rudogenez [Tectonics of the Southern Donbass and ore genesis]. Kyiv: UkrGGRI, 108. [in Russian]
