Paleostrukture of East Orenburg region

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Abstract


The article states new views on structural features of East Orenburg Oblast. Results of long-term research of geological party of Mineral Deposits and their Investigation Department in RUDN formed the basis of writing the article. Unlike the predecessors considering this territory as a fragment of a double-fold structure of Ural, the authors of the article realize the thought of paleovolcanic structure of the territory. Having carried out photointerpretation of multiband satellite images, the scheme of tectonic disturbances, which is a combination of ring and radial faults, has been received. These disturbances emphasize the large ring structure, the center of which settles down near the Zhetykol lake. The carried-out facies analysis of volcanogenic and sedimentary rocks showed that groups of rocks corresponding to the main facies of volcanic constructions - vent, slope and distal - are outstanding for the territory. Rocks of these facies were formed in two independent tectono-magmatic cycles: the Baikal - Ordovician-Silurian age, and Caledonian - Upper Devonian-Upper Carboniferous age. The magmatism sequence is homodromous in both cycles and particular intrusive facies correspond to each cycle. For the Baikal cycle the intrusions are presented by serpentinite and ultramafite. For the Caledonian cycle the intrusive rocks are presented by complex granitoid intrusions of three-facies composition (the initial stages of intrusion are presented by gabbro and gabbro-diorites, the second phase of intrusion - by diorites, syenites and granodiorites, the third phase - by various granites). Interaction of granitoids with serpentinite leads to remobilization of dunite from serpentinite and to formation of chromite industrial mineralization in the latter. The research results open new opportunities in the analysis of allocation and confinedness of the known endogenous ore objects and predicting the new.


About the authors

Victor V Diakonov

Moscow State Geological Prospecting University

Author for correspondence.
Email: mdf.rudn@mail.ru
23, Miklukho-Maklaya str., Moscow, 117997, Russian Federation

Doctor of Geological and Mineralogical Sciences, professor, head of Department of General Geology and Geological Mapping at Institute of Geology of Mineral Resources, Russian State Geological Prospecting University n.a. Sergo Ordzhonikidzе (MGRIRSGPU). Research interests: magmatism, tectonics, solid minerals exploration, paleovolcanic reconstruction

Alexander E Kotelnikov

Peoples’ Friendship University of Russia (RUDN University)

Email: kotelnikov_ae@pfur.ru
6, Miklukho-Maklaya str., Moscow, 117198, Russian Federation

Candidate of Geological and Mineralogical Sciences, associate professor, Department of Geology, Mining and Oil&Gas Engineering, Engineering Academy, Peoples’ Friendship University of Russia (RUDN University). Research interests: geochemistry, geochemical prospecting of solid mineral deposits, paleovolcanic reconstruction

Natalya V Zhorzh

Peoples’ Friendship University of Russia (RUDN University)

Email: zhorzh_nv@pfur.ru
6, Miklukho-Maklaya str., Moscow, 117198, Russian Federation

senior lecturer of Department of Geology, Mining and Oil&Gas Engineering, Engineering Academy, Peoples’ Friendship University of Russia (RUDN University). Research interests: geology, geochemistry, solid mineral deposits exploration

References

  1. Kotelnikov A.E. Mednogorskoe paleovulkanicheskoe sooruzhenie i perspektivy ego rudonosnosti [Mednogorsky paleovolcanic structure and prospects of its ore potential]. Abstract of dissertation for the degree of Candidate of Geological-Mineralogical Sciences. M., 2013. 24 p. (In Russ.).
  2. Diakonov V.V., Triapicyna A.S., Kotelnikov A.E. Otcenka perspektivnosti po territorii obekta “GDP-200 listov M-41-1,II,VII,VII, N-41-XX,XXVI,XXXI (Zauralskaia ploshchad, territoriia Rossiiskoi Federatcii)” na vyiavlenie medno-porfirovoi mineralizatcii [Prospectivity assessment of the territory of object “GDP-200 of the sheets M-41-1,II,VII,VII, N-41-XX,XXVI,XXXI (Zauralskaya Square, territory of the Russian Federation)” on identification of a copper and porphyritic mineralization]. Report of contract subject. M.: PFUR Publ., 2008. (In Russ.).
  3. Diakonov V.V., Kotelnikov A.E., Zhorzh N.V. Nauchnyi analiz materialov po obektu GMK-200 listov Q-41-XVI,XVII,XXI,XXII (Vostochno-Voikarskaia ploshchad) i otcenka perspektiv rudonosnosti po rezultatam geokhimicheskikh issledovanii [The scientific analysis of materials on object of GMK-200 of the sheets Q-41-XVI,XVII,XXI,XXII (Vostochno-Voykarskaya Square) and assessment of prospects of mineralization by results of geochemical research]. Report of contract subject. M.: PFUR Publ., 2009. (In Russ.).
  4. Lisov A.S. «GDP-200 listov M-41-I,II,VII,VIII, N-41-XX,XXVI,XXXI (Zauralskaia ploshchad, territoriia Rossiiskoi Federatcii)» [“GDP-200 of the sheets M-41-I,II,VII,VIII, N-41XX,XXVI,XXXI (Zauralskaya Square, territory of the Russian Federation)”]. Report of East geological mapping party. Nezhinka: JSC “Company Votemiro”, 2008. (In Russ.).

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Copyright (c) 2018 Diakonov V.V., Kotelnikov A.E., Zhorzh N.V.

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