HR: 1330h
AN: T12A-0448    [PDF]
TI: TECTONIC FEATURES OF THE BARGUZIN DEPRESSION OF THE BAIKAL RIFT ZONE USING COMPUTER INTERPRETATION OF ELECTRICAL SOUNDINGS DATA
AU: * Nevedrova, N
EM: ninan@uiggm.nsc.ru
AF: Institute of Geophysics, Prospekt Koptyuga, 3, Novosibirsk, 630090 Russian Federation
AU: Epov, M
EM: mepov@uiggm.nsc.ru
AF: Institute of Geophysics, Prospekt Koptyuga, 3, Novosibirsk, 630090 Russian Federation
AU: Sanchaa, A
EM: aidisa@emf.ru
AF: Institute of Geophysics, Prospekt Koptyuga, 3, Novosibirsk, 630090 Russian Federation
AB: In 1950s of the twentieth century, extensive geophysical prospecting was carried out in the region of Baikal Rift Zone with the aim to investigate the deep depression structure. The basic method of geophysical exploration was vertical electrical sounding (VES). At that time, the sufficiently complicated structure of the section gave no way of determining the main parameters of separate depositional sequences. With the development of computer techniques it has become the possibility to interpret these complicated data of electrical exploration at the new qualitative level by using programs of mathematical modelling and inversion. At the first stage, interpretation of electrical prospecting data was executed based on solution of the inverse problem within the limit of the horizontally-layered model using the SONET program complex. Moreover, by using both 2D modelling and inversion, it is possible to refine geoelectrical parameters and to conclude that entirely acceptable results can be obtained using 1D inversion. The final results reflect the detailed deep depression structure and it tectonic features. Tectonically active zone with multiple ruptures, which form complicated block structures as in the sedimentary cover so in the base, are under investigation.The sedimentary cover is as thick as 2.5 km according to results of computer interpretation. Fractured zones exhibit the areas with decreased rock resistivity. Reconstruction of a detailed tectonic structure of Barguzin depressions allow better understanding peculiarities of geodynamic processes for the Baikal rift zone in general and for depression in particular.
DE: 0910 Data processing
DE: 0925 Magnetic and electrical methods
DE: 8105 Continental margins and sedimentary basins
SC: Tectonophysics [T]
MN: 2003 Fall Meeting