Journal article
O-Hf isotope constraints on the origin of zircon in high-pressure mélange blocks and associated matrix rocks from Tinos and Syros, Greece
B Fu, B Paul, J Cliff, M Bröcker, F Bulle
European Journal of Mineralogy | Published : 2012
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 or metamorphic/hydrothermal in origin. Oxygen and hafnium isotope ratios in the dated zircons have been determined to further constrain their mode of formation. Spot analysis of zircons from metagabbro, eclogite, glaucophanite, jadeitite and chlorite schists by ion microprobe (CAMECA IMS-1280) yields a large range in S O, varying from 2.0 % to 7.6 % VSMOW. The average S O values for most zircons in 11 samples however fall within a relatively ..
View full abstractGrants
Awarded by University of Melbourne
Funding Acknowledgements
The authors gratefully acknowledge technical assistance of the AMMRF Flagship Ion Probe Facility (CMCA) at the University of Western Australia, funded by the University, State and Commonwealth Governments. This work was supported by the University of Melbourne (ECR-600838). Jiri Slama provided Plesovice zircon separates, John Valley and Mike Spicuzza analysed oxygen isotope ratio of the Plesovice zircon by laser fluorination at the University of Wisconsin-Madison. Constructive reviews by Craig Grimes, TzenFu Yui, Roland Maas and the guest editors Tatsuki Tsujimori and George Harlow led to improvement of this manuscript and are greatly appreciated.