Abstract
Two large blocks of Precambrian lower-crustal and upper-mantle rocks in East Siberia, the Arbansky and Saramtinsky massifs, were tectonically emplaced into the Late Archean Onotsky Greenstone Belt and the Early Proterozoic Sharyzhalgay Granulite Belt approximately 2 Ga. The Arbansky massif is an exposure of deep lithospheric rocks formed at the base of a Precambrian granulite belt. It consists of garnet granulite and eclogite formed at 20 to 34 kb and layers of enderbite (alkali charnockite) gneiss and garnet-kyanite schist. These rocks were intruded by spinel pyroxenite and spinel-hornblende peridotite while at pressures of 6 to 10 kb. The Saramtinsky massif is an exposure of Precambrian mantle material that consists of spinel harzburgite equilibrated at 10 to 12 kb but that hosts lensoidal bodies of spinel websterite and garnet websterite equilibrated at 8 to 11 kb and 24 to 31 kb, respectively. These observations are best reconciled with an evolutionary model in which deep lithospheric rocks that equil...
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