Fingerprinting multistage fluid-rock history during metamorphism: Evidence from grain scale Sr, O and C isotopic and trace element variations in high-grade marbles from East Antarctica

Abstract

Elucidating fluid-rock history from a metamorphosed sedimentary rock that has experienced a protracted history in the continental crust is a difficult task. Here we present results of grain to sub-grain scale strontium, oxygen and carbon isotope variations along with LA-ICPMS trace element geochemistry of texturally distinguished carbonates and silicates using cathodoluminescence microscopy, in the granulite grade marble horizons interlayered with metapelitic granulites from two key localities of Skallen and Skallevikshallsen at the Lutzow Holm Bay, East Antarctica. In addition, we have also geochemically characterized some key metamorphic minerals, such as scapolite and apatite, which are sensitive to changing fluid compositions. Such an integrated geochemical approach helped us to reconstruct the multistage metamorphic fluid-rock history preserved in the marble.