Dzhida-Udinsky Fault (Baikal Region): Specificity of Internal Structure
Specificity of internal structure Dzhida-Udinsky fault zone at two scale levels was investigated: within the limits of wide area (~15 kms) of residual deformations of the rocks connected with its formation, and in vicinities of main fault plane. Structuralparagenetic analysis allowed to establish the most characteristic combination of fault dispositions which includes: 1) the main normal fault plane – dip azimuth 140º with dips of 58º 2) the normal fault – dip azimuth 321º with dips of 78º 3) sublatitudinal left-hand strike-slip fault – trend azimuth 276º 4) right-hand strike-slip fault – trend azimuth 24º. Probably, the Dzhida-Udinsky fault was activating in Cenosoic, since normal faults are detected in sediments of the Ivolga-Uda basin. In addition, the fault was developing as uplift and strike-slip with the left-hand component of displacement at different stages of its development. The main fault plane is located at the foot of the slope and is characterized by an abrupt change of the rock conductivity on the geoelectric section. This is probably due to the considerable thickness of clastic formations under the slope, as well as the intense rock destruction of the hanging wall of fault. There are single faults on tectonic slope. They are expressed by low values of electrical resistivity, highs of relief gradient and volumetric activity of radon anomalies in subsoil air.