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Geological Society, London, Special Publications; 2003; v. 220; p. 49-64;
DOI: 10.1144/GSL.SP.2003.220.01.03
© 2003 Geological Society of London

Improving the Link Between Accessory Phase Chronometers and Petrological Information

Rare earth elements in zircon: a review of applications and case studies from the Outer Hebridean Lewisian Complex, NW Scotland

Martin J. Whitehouse

Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden martin.whitehouse{at}nrm.se

Rare earth element (REE) analysis of zircon coupled with high spatial resolution U-Pb geochronology and imaging is emerging as a useful petrogenetic tool capable of providing a link between dated zircon growth and contemporaneous magmatic conditions or metamorphic reactions. Notable amongst recent studies has been the link established between zircon growth in equilibrium with garnet and characteristic heavy REE depletion in zircon which has enabled the dating of specific pressure-temperature (P-T) evolution. Links to other REE-bearing minerals have yet to be established but have similar potential for dating P-T pathways. A brief review of recent applications in both igneous and metamorphic zircons is presented here to illustrate the range of investigations in this rapidly developing area. The method is then applied to two case studies from the late-Archaean Lewisian Composite Terrane of the Outer Hebrides, NW Scotland. In both cases, these new zircon REE analyses reveal previously unknown events in the early history of these samples, as well as clarifying the relationship of different zircon growth phases in relation to the geochronology.





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[Abstract] [PDF]