M.D. SIDOROV (RGC FEB RAS), A.V. RAZUMNY, E.P. ISAEVA (VSEGEI)

Crustal model and tectonic zoning of the continent­ocean transition zone in the Chukchi­-Koryak­-Kamchatka sector of the Pacific Fold Belt

Maps of the deep structure and tectonic zoning of the continent­-ocean transition zone have been compiled for the Chukchi­-Koryak­-Kamchatka sector of the Pacific Fold Belt. The maps are part of a digital 1:1 M seamless maps package of the Far East area. A brief description of the crustal structure in the ocean-­to-­continent transition zone is given. Data on the depth of the main structural surfaces such as the roof and the bottom of the consolidated crust, the thickness of the crust and its constituent parts – volcanic­-sedimentary, granite-­metamorphic and granulite­-basitic layers are presented. The earth crust is represented by three types: oceanic, transitional and continental. The minimum thickness is 12 to 24 km in oceanic crust blocks, the maximum one is 40 to 47 km in continental blocks. The method of generalization of deep geophysical soundings and their correlation by means of density modeling was applied in map compiling.
Keywords: Earth crust, density model, fold area.