Abstract
The oxygen isotope composition of minerals from metamorphic rocks carries information on the nature of the protolith, the temperature of the metamorphism peak, and the isotope composition and content of the fluid phase participating in the metamorphic process. Among the main sources of fluid in highgrade meta� morphism are hydrous minerals, for example, those delivered to the subduction zone with sedimentary and metamorphic rocks of the oceanic slab. The process of dehydration should result in the oxygen isotope shift in the dehydrated rock (restite), the surrounding crustal rocks, and the overlying rocks of the mantle wedge. Currently it is generally accepted that the oxygen isotope effect under metamorphic dehydration is very low (<1 ‰) (1). Moreover, small isotope shifts become poorly reflected against the background of the variable lithology of rocks in metamorphic complexes. More and more rocks with anomalously light or widely ranging oxygen isotope composition are found in granulitic and eclogitic metamorphic complexes. Signif� icant oxygen isotope lightening ( δ 18 O up to -11‰) was observed in eclogite and gneiss of the Dabie-Sulu belt in China; moderate oxygen isotope lightening (up to -4‰), in eclogite of the Kokchetav massif; and extreme oxygen isotope lightening (δ 18 O from -16 to
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