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    The thermal history and annealing effects in zircons from the Ordovician of North Wales

    Carter, Andrew (1990) The thermal history and annealing effects in zircons from the Ordovician of North Wales. International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements 17 (3), pp. 309-313. ISSN 1359-0189.

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    Zircon and apatite fission track dates obtained from 14 Ordovician rocks of North Wales reveal ages re-set to the Carboniferous (zircon), Permian and Cretaceous (apatite). A trend is observed between individual zircon crystal ages (together the total count age) and their respective uranium contents, with older crystal ages corresponding to lower uranium contents and vice versa. The trend has also been noticed by other fission track workers. Reasons for the trend are explored, resulting in a statistical explanation. The zircon dates are discussed with respect to the post-Caledonian thermal history of North Wales. A simple regional interpretation of cooling rates is prevented by anomalies attributed to mineralisation, aided by deep basement fracture zones. The geological data suggest a zircon fission track closure temperature of 200°C is relevant to this study.


    Item Type: Article
    School: School of Science > Earth and Planetary Sciences
    Depositing User: Sarah Hall
    Date Deposited: 06 Aug 2019 13:22
    Last Modified: 06 Aug 2019 13:22


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