Oxygen Isotopes Effects due to Dehydration of the Blueschist: the Experimental Data under P-T Conditions of Subduction Zone

摘要

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 high-grade metamorphism 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.