O-Hf isotope constraints on the origin of zircons in high-pressure mélange blocks and associated matrix rocks from Tinos and Syros, Greece

Abstract

Most previously dated zircons in high-pressure mélange blocks and associated matrix rocks from Tinos and Syros (Cyclades), Greece, yielded ion microprobe (SHRIMP II) U-Pb ages of ca 80 Ma. In many cases it remains unclear whether the zircons are igneous