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FEATURES OF THE STRUCTURE OF COLLISION ZONES OF THE CENTRAL PART OF THE EAST EUROPEAN CRATON
Abstract
In the given work the new velocity model of the central part of the East European craton is presented. To achieve this goal six broadband seismic stations were installed along the profile about 500 km long. To recall the velocity structure, the receiver function technique has been used. For the inversion we used Levenberg - Marquardt algorithm for both P-to-S and S-to-P converted waves along with the travel times discrepancy of the transition zone 410-660 km. Preliminary processing of the velocity sections made it possible to investigate the inner velocity structure along a sublatitudinal profile from the marginal zone of the Sarmatia microcontinent through the multidirectional collision zones, to the marginal zone of the Volga-Uralia microcontinent. The structure of the collision zones, which was investigated at the ?Aleksandrovka?, ?Mikhnevo?, ?Obninsk? and ?Voskresensk? observation points, may be associated with the Proterozoic tectonic processing and upward movements of the mantle plumes. The marginal zone of the microcontinent Volga-Uralia belong to the region of the partially reworked Archean crust and were studied at the observation point ?Shatura?. The deep structure of the Tokmovskiy ovoid of the Volga-Uralia microcontinent was investigated in the ?Monakovo? registration point. In the velocity sections, the complex transition crust-upper mantle zone is clearly distinguished, which is a combination of the boundaries of Moho, corresponding to the various tectono-magmatic stages of the region. Revealed increased (relative to the reference model IASP91) velocities in the upper mantle are traced at all stations. A layer of lower velocities is observed in the depth range of 100?150 km.
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References15
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