Provenance of eclogite in the Bohemian massif: Geochemical and geochronological study of eclogite from the Krušné hory, Marianské Lázně, and Velké Vrbno units.
Eclogite is the high-pressure equivalent of basaltic igneous rocks and are widely distributed throughout the Bohemian massif (Fig. 1; Konopásek, 2011; Massonne, 2011 and references therein). Eclogite has important geodynamic significance for the identification of terrane boundaries, and exploring the circulation and interaction of materials deep below the earth’s surface. Study of their metamorphic transformations and evolution can provide important insights into the evolution of subduction zone and collisional orogenesis (e.g. Štípská et al. 2012; Faryad et al. 2013; Collett et al., 2017). However, relatively less attention is paid to the origin of the eclogite protoliths, their provenance and geodynamic setting. Understanding of this early evolution, prior to HP transformation, is critical to interpreting the significance of eclogite exposures. Geochemical and geochronological investigation provides powerful tools for deciphering the nature of eclogite protoliths as well as assessment of elemental fluxes in and out of these eclogites during subduction zone metamorphism.