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The article aims to determine features of sectarianism development in the Saratov gubernia (province) in the pre-revolutionary period. Drawing upon both published and archival materials from federal and local archives (i.e., materials of the Saratov Gubernial Statistical Committee from the State Archive of Saratov Region, fond 421) the author succeeds in evidentiating a twofold increase in number of sectarians in the region and identifying cluster areas of various teachings. Record-keeping materials of the Chancery of the Synod and those of the Department of Religious Affairs of Foreign Faiths of the Ministry of Internal Affairs (Russian State Historical

The convergence zones of lithospheric plates in the Northwest Pacific are the boundaries of the two main isotopic domains of the Earth - the Indian and Pacific MORB types, separated be cold oceanic lithosphere. This configuration limits of their interaction by special geodynamic environments - the influence of deep plume sources or the distraction of the subducted slab and intrusion of the oceanic asthenosphere into the subcontinental mantle wedge. The latter mechanism is reconstructed in the Central Kamchatka Depression on the basis of geological, geochemical, and high-precision (double-spike) lead isotopic data. The role of the oceanic asthenosphere in magma generation in the zones of convergence of oceanic and continental lithospheres is a poorly studied but not unique phenomenon that must be considered under geodynamic reconstructions and the creation of new, more realistic models of the juvenile continental crust formation.