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ON RECENT GEODYNAMICS OF THE GREAT CAUCASUSтезисы доклада
- Авторы: Guseva T.V., Lukk A.A., Mishin A.K., Prilepin M.T., Schevchenko V.I., Yunga S.L.
- Сборник: The Ninth International Symposium On Recent Crustal Movements (CRCM ‘98) in Cairo-Egypt
- Тезисы
- Год издания: 1998
- Место издания: Cairo - Egypt, C3
- Аннотация: The main problems of intraplate active tectonics and geodynamics of the Great Caucasus are discussed on the basis of new data of geology, geodetic GPS-measurements and main seismotectonic features of this region. Nappes and thrusts due to the stresses of subhorizontal compression play a leading part on tectonic structure of many movement belts, as well as at Great Caucasus. Investigation of the focal mechanisms of earthquakes of this region reveled that subhorizontal compression directed across the strike of tectonic structure play a leading part at recent time also. The testing hypothesis is that the nappes and thrusts of the Great Caucasus may be interpreted as a result of northward drift of the Arabian lithosphere plate and its collision with Eurasian plate. Nappes and thrusts of the Great Caucasus are of south vergence kind manly. So its are considered as underthrusts due to northward shifts of microplates usually. There are geological data contradict this notion however. Geodetic (GPS) measurements of horizontal movements of number sites were conducted on the Great Caucasus territory in 1991, 1994, 1996, 1997 years relatively Eurasia plate. The collision of the Eurasian and the Arabian plates has a limited effect on the Great Caucasus intraplate tectonics and practically does not affect the geological structures and geodetic GPS-movements. These measurements revealed that real movements here happen southward mostly. In means that tectonic slabs are of thrusting (from north to south) but not undethrusting (from south to north) nature. Thrusts and nappes are the intraplate dislocation here. They are connected with growth of volume of layered cover of earth crust as a result of additional matter inflow by deep origin fluids maybe. The analogous combination of geological data were revealed by our works on the on the Aphganistan-Tadjik depression (Tadjikistan)and the Great Basin (USA).
- Добавил в систему: Лукк Альберт Артурович