The latest neotectonic structures in the Eastern Dagestan

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Late orogenic structural plan was distinguished with orotectonic method in addition to two well-known structural plans, i.e., late geosyncline and early orogenic, in the territory of Eastern Dagestan, which is the western near-orogenic flank of the Tersk-Dagestan foredeep. This structural plan unites the youngest neotectonic structures and determines the main features of the modern relief. It is characterized by the predominance of blocky structures associated both with the activation of arched orogenic uplift and with the taphrogenic influence of developing Caspian depression. The block structures of this structural plan determine localization of modern exogenous processes including geohazards and disruptures, which must be taken into account upon construction, irrigation and other economic activities. Therefore, the study of this structural plan is not only of theoretical, but also of practical significance.

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作者简介

S. Nesmeyanov

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

Email: voa49@mail.ru
俄罗斯联邦, Ulanskii per. 13, bld. 2, Moscow, 101000

O. Voeykova

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: voa49@mail.ru
俄罗斯联邦, Ulanskii per. 13, bld. 2, Moscow, 101000

参考

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2. Fig. 1. Fragment of the map of the latest tectonics of the South of the USSR (edited by L.P. Polkanova [5]). 1 - isolines of the total amplitudes of neotectonic movements, drawn along the base of the latest deposits, 2 - the boundary of the distribution of the latest deposits, 3 - the latest ruptures; 4-7 — local uplifts: 4 — expressed in relief, 5-7 — containing deposits: 5 — oil, 6 — oil and gas, 7 — gas condensate (numbers — structure numbers: 233 — Shevchenkovskoye, 234 — Volohovskoye, 235 — Brigadirovskoye, 236 — South Brigadirovskoye, 237 — Sabinskoye, 238 — North Golubovskoye, 239 — Druzhelyubovskoye, 240 — Zaitsevskoye, 241 — Olgovskoye, 242 — West Nezhinskoye, 244 — Khimoryabushinskoye, 245 — Tvanskoye, 246 — Doroginskoye, 247 — Krapivnyanskoye, 248 — Khomovskoye, 249 — South Doroginskoye, 251 — Parafiyevskoye.

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3. Fig. 2. Geological and geomorphological profiles of Eastern Dagestan. The profile lines are shown (I, II, III) in Fig. 3. Legend: 1-2 - boundaries: 1 - Makhachkala orogenic wing and mega-arch of the Greater Caucasus, 2 - Sergokala and Derbent regional structural stages; 3 - faults, indicating the direction of displacement along them and the amplitude of displacement of erosion-denudation levels; 4 - cirque-shaped faults; 5-8 - the newest deposits: 5 - Akchagyl stage, 6 - Apsheron stage, 7 - Middle-Upper Quaternary complex, 8 - Upper Quaternary; 9-10 - indices of structures: 9 - faults, 10 - block; 11-12 — erosion-denudation levels: 11 — Akchagyl, 12 — Apsheron.

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4. Fig. 3. The youngest neotectonic structures of Eastern Dagestan: A — block, B — faults and flexures. Legend: 1-2 — boundaries: 1 — Makhachkala orogenic wing and mega-arch of the Greater Caucasus, 2 — Sergokala and Derbent regional structural steps and the Sulak Depression; 3 — mega-arch of the Greater Caucasus; 4-8 — structures of the high Sergokala regional structural step: 4 — horsts, 5 — horst steps, 6 — structural steps, 7 — graben steps, 8 — grabens, 9-13 — structures of the Derbent low regional structural step: 9 — uplifts, 10 — structural steps, 11 — high cirque-shaped steps, 12 — cirque-shaped steps, 13 — low cirque-shaped steps; 14 — Sulak Depression; 15 — indices of the newest block structures (see Table 2); 16–18 — faults and flexures: 16 — normal faults, 17 — cirque faults, 18 — flexures; 19 — indices of the newest fault structures and flexures (see Table 3); 20 — lines of structural-geomorphological profiles (see Fig. 2).

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5. Fig. 4. Structural and geomorphological scheme of the Makhachkala-Caspian area. Legend: 1 — boundaries of the Sergokala and Derbent regional structural steps and the Sulak Depression; 2-5 — structures of the high Sergokala regional structural step: 2 — horsts, 3 — horst-steps, 4 — structural steps, 5 — grabens; 6-9 — structures of the Derbent low regional structural step: 6-7 — within the Makhachkala uplift: 6 — horst, 7 — structural step; 8 — step; 9 — lowered step; 10-12 — structures of the Sulak Depression; 10 — high step, 11 — step, 12 — lowered step; 13 — indices of the newest block structures (see Table 2); 14-16 — faults and flexures: 14 — normal faults, 15 — cirque faults, 16 — flexures; 17 — indices of the newest fault structures and flexures (see Table 3); 18 — Holocene local plicative structures and their indices (see Table 4). The Sergokalinsky regional stage is separated here from the Derbent regional stage by the South Makhachkala (2) and West Achisuysky (4) normal faults.

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6. Fig. 5. Structural and geomorphological scheme of the Derbent area. Legend: 1 — boundary of the Sergokala and Derbent regional structural stages; 2-5 — structures of the high Sergokala regional structural stage: 2 — horsts, 3 — horst-stages, 4 — structural stages, 5 — grabens; 6-10 — structures of the Derbent low regional structural stage: 6-8 — within the Derbent uplift: 6 — high stage, 7 — stage; 8 — low stage; 9 — high cirque-shaped stages, 10 — cirque-shaped stages; 11 — indices of the newest block structures (see Table 2); 12-14 — faults and flexures: 12 — normal faults, 13 — cirque-shaped faults, 14 — flexures; 15 — indices of the newest fault structures and flexures (see Table 3) 16 — Holocene local plicative structures and their indices (see Table 4).

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