Oxygen isotope geochemistry of the Rhodope polymetamorphic terrain in northern Greece; evidence for preservation of pre-metamorphic isotopic compositions

Fluid infiltration during eclogite to amphibolite transformations in this polymetamorphic terrain did not result in any significant modification of isotopic compositions, as demonstrated by the preservation of outcrop-scale compositional heterogeneity in metabasic rocks and modelling of marble-amphibolite isotopic profiles which show that cross-layer advective fluid and diffusional exchange transport was minimal. The Delta (super 18) O compositions of the metamorphic rocks are largely inherited from their igneous and sedimentary parent rocks, indicating that the isotopic signatures of the protoliths of the Rhodope metamorphic rocks were not modified during metamorphism.