A detailed petrologo-geochemical study of basic and ultrabasic rocks of the Biryusa block has shown that they resulted from metamorphism of weakly differentiated rocks of the lherzolite–olivine websterite series and tholeiitic basalts. The temperatures of formation of igneous pyroxenes of ultrabasic rocks are estimated at 1100–1200 °C. The subsequent high-pressure metamorphism at 800–900 °C and 16–20 kbar produced garnet parageneses in the most ferruginous derivates of ultrabasic magma and in basic rocks.
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