Home – Home – Jornals – Russian Geology and Geophysics 2001 number 8

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 lhersolite-olivine websterite series and tholeiitic basalts. The temperatures of formation of igneous pyroxenes of ultrabasic rocks are estimated at 1100–1200 ^oC. The subsequent high-pressure metamorphism at 800– ^oC and 16-20 kbar produced garnet parageneses in the most ferruginous derivates of ultrabasic magma and in basic rocks.