High precision Lu–Hf geochronology of Eocene eclogite-facies rocks from Syros, Cyclades, Greece

Dating the initiation of Piemonte-Liguria Ocean subduction: Lu–Hf garnet chronometry of eclogites from the Theodul Glacier Unit (Zermatt-Saas zone, Switzerland)

“…Their high Hf content can strongly influence the Lu-Hf system (Scherer et al 2000). This problem can be minimized by the selective dissolution procedure for garnet of Lagos et al (2007).…”

Kinematic reconstructions and magmatic evolution illuminating crustal and mantle dynamics of the eastern Mediterranean region since the late Cretaceous

“…The latter was partly accreted to the Pelagonian nappe contributing to the building of the Hellenides, while its buried part underwent early Eocene HP-LT metamorphism recorded in the Cycladic Blueschists unit and the Cycladic basement [Bonneau and Kienast, 1982;Bonneau, 1984;Wijbrans and McDougall, 1988;Tomaschek et al, 2003;Lagos et al, 2007]. These units were then progressively exhumed up to the end of the Eocene in the Cyclades and in the Olympos, Ossa and Pelion tectonic windows as a synorogenic extrusion wedge bounded by the Vari detachment on top (in Syros) and the SCSZ at the base (in Ios) (figure 9) Ring et al, , 2010Brun and Faccenna, 2008;Huet et al, 2009;Jolivet and Brun, 2010].…”

“…~15-20 kbar, ~500 °C) whose metamorphic peak is dated at ~50 Ma, forming the Cycladic Blueschists unit and the Cycladic basement [Bonneau and Kienast, 1982;Bonneau, 1984;Wijbrans and McDougall, 1988;Tomaschek et al, 2003;Lagos et al, 2007]. Exhumation of these metamorphic units first occurred between 45 and 35-30 Ma in a syn-orogenic context, following a cold retrograde path (figure 5) [Altherr et al, 1979;Bonneau and Kienast, 1982;Avigad and Garfunkel, 1989;Trotet et al, 2001].…”

Models of garnet differential geochronology

“…The Lu-Hf dating method is much less sensitive to inclusions because garnet Lu concentrations are high, and because contamination by Hf-rich phases can be readily avoided. Few common minerals except zircon and rutile take up significant Hf, and benchtop dissolution minimizes any zircon and rutile contamination (e.g., Scherer et al, 2000;Connelly, 2006;Lagos et al, 2007 greater ranges in isotopic values. Uncertainties in isotopic ratios were assumed to be 0.5% for interelement ratios.…”