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Ophiolites from the northern slope of the Kuznetsk Alatau (north-western sector of the Altay-Sayan folded area) are the most typical fragments of suboceanic crust, which was formed in the Riphean. This investigation presents and interprets the results of petrochemical and geochemical studies the composition of basite rocks of these ophiolite paragenesis from the Severnaya, Zelenaya, Barkhatnaya mountains and Semenovsky massif. The contents of petrogenic oxides and trace elements were measured by X-ray fluorescence...