Unusual sector zoning in Lewisian zircons

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Authors:Hoffman, J. F.; Long, J. V. P.
Author Affiliations:Primary:
Univ. Cambridge, Dep. Earth Sci., Cambridge, United Kingdom
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 48 Part 4(349), p.513-517. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1984
Note:In English. 8 refs.; illus.
Summary:An unusual form of sector zoning has been recorded in some Lewisian zircons. The sectors lie in a plane cut perpendicular to the c-axis and are observed as variations in the intensity of cathodoluminescence, and in trace-element concentrations. Sectors radiating from the centre of growth out to the {100} faces exhibit low-intensity cathodoluminescence and are enriched in Y and depleted in Hf and Zr. Those radiating to the {110} faces are brightly luminescent, slightly enriched in Hf and depleted in Y. X-ray diffraction data, and comparison with previous studies of zircons, suggest that the sectors vary slightly in crystallographic orientation, such that the boundaries between sectors form discontinuities in the structure. [R.A.H.]
Subjects:Cathodoluminescence; Crystal chemistry; Geochemistry; Hafnium; Lattice; Lewisian; Metals; Mineralogy; Minerals; Nesosilicates; Orthosilicates; Precambrian; Proterozoic; Rare earths; Silicates; Upper Precambrian; Yttrium; Zircon; Zircon group; Zirconium; Zoning; Europe; Gairloch Scotland; Great Britain; Highland region Scotland; Scotland; United Kingdom; Western Europe; Poolewe; Ross and Cromarty; Sector zoning; Tollie Gneiss
Coordinates:N574000 N574700 W0053500 W0054500
Abstract Numbers:85M/0702
Record ID:1985047679
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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