Abstract:The article is to complete the description of the special mapping method which theoretical basis and principles were published in . With reference to data on the Ulirba site located in Priolkhonie (Western Pribaikalie), the content of special mapping is reviewed in detail. The method is based on paragenetical analysis of abundant jointing which specific feature is the lack of any visible displacement indicators. There are three stages in the special mapping method (Fig. 3) as follows:Stage I: Preparation and analysis of previously published data on the regional fault structure (Fig. 1, А-Г), establishment of a networks of stations to conduct structural geological monitoring and mass measurements of joints, record of rock data (Fig. 2, А), general state of the fault network (Fig. 1, Д-З), fracture density (Fig. 2, Б) and, if any, structures of the above-jointing level (Fig. 1, Е, З; Fig. 2
, А).Stage II is aimed at processing of field data and includes activities in four groups (II.1-II.4) as follows: Group II.1: construction of circle diagrams, specification of characteristics of joint systems and their typical scatters (Fig. 4, А), identification of simple (generally tipple) paragenesises, and determination of dynamic settings of their formation (translocal rank) ( Table 1), evaluation of densities and complexity of the joint networks, analysis of their spacial patterns within the site under mapping, and identification of the most intensively destructed zones in the rock massif (Fig. 2, Б-В). Group II.2: comparison of jointing diagrams with reference ones showing joint poles (Fig. 4, Б-В; Е-З; Л-Н), and, in case of their satisfactory correlation, making a conclusion of potential formation of a specific joint pattern in the local zone of strike-slip, normal faulting or reverse faulting (Fig. 4, Г-Д, И-К, О-П; Fig. 5; Fig. 7, Б), and determination of relative age relationships between such zones on the basis analysis of the scatter of joint systems, shearing angles and other relevant information. Group II.3: construction of a circle diagram for the specified mapping site with local fault poles (Fig. 8, Б), identification of conjugated systems and dynamic settings of their formation (Fig. 2), plotting the information onto the schematic map of the location under study, and marking the transregional fault zones (Fig. 7, В-К) with observation sites showing similar settings and paragenesises of local faults. Group II.4: comparison between diagrams of fault poles of local ranks with reference patterns selected according to the availability of conjugated pairs of fractures (Fig. 9, Б-Г); based on the above comparison, decision making on potential formation of a paragenesis of local faults in the strike-slip, normal and reserve/thrust fault zones (Fig. 9, Д-Ж), and delineation of boundaries of such zones in the schematic map by connecting the observation sites with similar solutions (Fig. 7,
Л-Н).Stage III is aimed at interpreting and includes comprehensive analyses of mapping results and priori information, co...