Abstract
The paper presents the results of studying the lithochemical features of the Late Jurassic-Early Cretaceous tuff-terrigenous rocks of the Ust-Belsky and Algan terranes. Tuff-terrigenous rocks represented by medium-fine-pelitic-grained quartz-feldspar and feldspar greywackes. According to the results, they were formed due to the erosion of intermediate and basic composition volcanic formations, in the marine environment, near the coast. The main source was associated with the island arc in the northwest of the region. Tuff-terrigenous rocks of Ust-Belsky terrane formed in different parts of the forearc basin. Tuff-terrigenous rocks of Algan terrane formed in the trenchslope basin.
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