Late Permian high-pressure metamorphism in the Devesil Unit, East Rhodopes (SE Bulgaria) – Single or multiple metamorphic events

Abstract

Metaeclogites from the Devesil Unit, East Rhodopes are studied. Well preserved eclogite paragenesis is presented by omphacite+garnet+rutile and is obliterated by still high temperature retrograde assemblage of newly formed garnet, diopside, amphibole, plagioclase, titanite, and quartz. The P-T conditions of the high pressure metamorphism are in the range 620–665 °C and 1.8–2.0 GPa, whereas the retrograde stage occurs at temperature 600–650 °C and pressure 0.6–0,8 GPa. Cathodoluminescence images and LA-ICP-MS dating of zircon grains point to multiple metamorphic origin of the mineral the earliest with Late Permian–Early Triassic age, followed by Early Jurassic and Early Cretaceous metamorphic events.