Milyukov V.К., Drobishev V.N., Mironov А.P., Steblov G.M., Hubaev H.М. Оssetian geodetic satellite network: creation and first results of geodinamic monitoring.
The Ossetian part of the Greater Caucasus, being one of the most tectonically active regions of the Caucasus, until recently wasn't covered by the high-precision geodetic measurements based on satellite methods. Since 2010 the network of geodetic points for carrying out the periodically - repeated measurements by the mobile GPS equipment was developed in this region by the аuthors of this work, and also three permanent GPS stations were established. The technique of data processing and results of GPS measurements in 2010-2013 are given in this work. Estimates of velocities of horizontal movements are given in three reference systems: in the terrestrial coordinate system ITRF2008, relative to fixed Eurasia and in the local reference system determined by the stationary station ARDN. The obtained results, besides the general submeridional movement of the region connected with convergence of the Eurasian and Arabian plates, revealed a number of the tectonic features caused, apparently, by continuing local processes of formation of the tectonic structure of this region.
Keywords: satellite geodesy, GPS measurements, modern earth crust motion, regional tectonic processes.
References
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Gazeev V.M., Gurbanov A.G., Lexin A. B., Goldsman Yu. V., Oleinikova T.I. A new isotope-geochemical and mineralogenical data on Early-Jurassic Marinsky
volcano-plutonic complex (river Podkumok head, Karachaevsky volcanic area, North
Caucasus).
The paper is devoted to solving of the important for the Great Caucasus geology problem – «The sources of melts, paleogeodynamic conditions, existing during Early-Alpine volcanic activity at the southern margin of the Eastern European Platform and its role in shaping of the continental crust» and «Minerageny of the Early-Alpine magmatic complexes». In the context of these problems the investigations was aimed on solving of the following task: petrochemical, mineralogical, geochemical, isotope and mineragenic characteristics of the rocks of the Early-Alpine magmatic complexes of the Great Caucasus. The representative samples from rocks of Marinsky complex (MC) was collected and investigated by modern analytical methods (XFA, ICP MS, isotope analyses). Petrology-geochemical and isotope (87Sr/86Sr – in andesite-basalt=0.7054–0.7059; in andesite= 0.7045 and 143Nd/ 144Nd – 0.51248 и 0.51252, εNd(Т)=1.85–2.72, respectively) peculiarities of the Low-Jurassic volcanites of MC (andesite-basalt, andesite, andesi-dacite and dacite)/ situated at the southern part of Scythian Platform have been revealed.
On the diagnosis, performance and composition diagram the dots of volcanic rocks of MC are situated in fields of rocks which have been origin in active continental margin or in continental arc island. Double-faced characteristics was depends upon by lesser (thickness 40–45 km) of continental lithosphere of Scythian Platform, than in classic an active continental margin of Andian type (thickness 60-70 km) and lager, than in continental arc island (thickness 15–25km). The role of the Early-Alpine volcanic belt, including its part - Marinsky complex, in forming the continental crust of the Great Caucasus, judging from, volumes of effusive and intrusive material, is rather significantly.
Keywords: Marinsky volcano-plutonic complex; petrochemical, geochemical, isotope and mineragenic data; geodynamic paleoconditions; minerageny of the Early-Alpine magmatizm.
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Milyukov V.К., Drobishev V.N., Mironov А.P., Ovsyuchenko A.N., Hubaev H.М. Implementation of the high-precision geodetic network for studying of modern
movements of the Vladikavkaz fault zone with use of GPS technology.
The Vladikavkaz Fault Zone is a regional boundary between the Alpine folded-block system of the Great Caucasus and the Pre-Caucasus foredeep (Ossetian depression). Studying of modern crust movements in contact zones and the fault structures is essential both for the correct understanding of modern dynamics of earth's plates and blocks, and deep forces and internal processes, managing their evolution. In 2014 within realisation of the plan of research works of VNC of RAS- Government RSO-Alania and the project of the RFBR on studying of modern geodynamics and a deep structure of the TheVladikavkaz Fault Zone the geodetic network for monitoring of the state of this structure with use of satellite geodesy technology has been created.
Results are presented in this paper.
Keywords: satellite geodesy, GPS measurements, modern earth crust motion, regional tectonic processes.
References
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Drobyshev C.N., Torchinov H-M.Z., Tutubalina, O.C., Hubaev H.M. Main topographical data and kinematics of the Devdorakskiy collapse on may 17, 2014
In the present work, the material characterizing the main topographical and dynamic parameters of ice-rock collapse in the valley river Terek and Georgian Military road from the Devdorak glacier May 17, 2014. There is not unsubstantiated assumption about anticipatory activation of magmatic factor that played a role root cause that triggered a powerful exogenous movement catastrophic level in the area of Kazbegi volcanic centre.