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Journal of the Geological Society

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Fission track dating of alluvial zircons and heavy mineral provenance in Northeast Tasmania

W. W.-S. Yim, A. J. W. Gleadow^* and J. C. van Moort

Department of Geography and Geology, University of Hong Kong, Hong Kong
^* Department of Geology, University of Melbourne, Parkville, Victoria 3052
Department of Geology, University of Tasmania, Hobart, Tasmania 7005, Australia

Three alluvial zircon concentrates from the Blue Tier region have been fission track dated in a heavy mineral provenance study of Cenozoic sediments in NE Tasmania. Zircons in one concentrate are euhedral and are fine grained (mostly 0.1 to 0.3 mm). Dating gave a combined age of 367 ± 15 Ma confirming their derivation from Upper Devonian granites. Zircons from the other concentrates are rounded and coarser-grained (mostly 2–5mm). They gave a combined age of 46.7 ± 0.6 Ma. This agrees with the K-Ar radiometric dates obtained from three Blue Tier basalts (Sutherland & Wellman, pers. comm.). Some of the geological implications of this study are outlined in this paper.

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