An investigation of cathodoluminescence in albite from the A-type Georgeville granite,Nova Scotia |
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| Authors: | Kim N Dalby Alan J Anderson Anthony N Mariano Robert A Gordon Robert A Mayanovic Richard Wirth |
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| Institution: | 1. Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, CZ-16500 Praha, Czech Republic;2. Department of Chemistry, Faculty of Science, Masaryk University, Kotlá?ská 2, CZ-611 37 Brno, Czech Republic;3. Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway;4. Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom;5. 14 Park an Fenten, St. Agnes, Cornwall TR5 0A5, United Kingdom;6. Camborne School of Mines, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn Campus, Cornwall TR10 9FE, United Kingdom;1. Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, 128 ul. Lermontova 128, Irkutsk, 664033, Russia;2. Far Eastern Federal University, ul. Sukhanova 8, Vladivostok, 690091, Russia;3. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Favorskogo 1a, 664033, Irkutsk, Russia;4. Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakhyanovoi 6a, Ulan-Ude, 670047, Russia;5. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia |
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| Abstract: | Cathodoluminescence (CL) reveals red and blue colors within single, non-turbid albite (Ab98–99) grains from the Georgeville granite, Nova Scotia. A 720 nm X-ray excited optical luminescence (XEOL) peak characterizes red CL regions, while a 280 nm XEOL feature dominates blue CL regions. Synchrotron X-ray fluorescence results indicate that red CL and the 720 nm XEOL peak intensities relate to total Fe concentrations. The relationship between red CL and Fe content is confirmed by electron microprobe (EMPA) and laser ablation-inductively coupled mass spectrometry (LA-ICP-MS). The XEOL technique is used to exclude the Fe K-edge as the cause of red CL. X-ray absorption spectroscopy results indicate that Fe in both the red and blue CL regions is Fe3+, and that red CL activation may relate to the Si–Al order of the feldspar and to the distribution of Fe on tetrahedral sites. The CL textures, combined with EMPA and LA-ICPMS analyses, indicate that blue CL albite (Ab98) regions contain higher concentrations of Ca, Ti, Pb and rare earth elements, and were replaced, in part, by a more Fe-rich, trace element depleted albite (Ab99) which displays red CL. Complex diffraction contrasts and amorphous deposits identified in transmission electron microscope images suggest that aqueous fluids have reacted with both red and blue CL regions. Fluid inclusion homogenization temperatures of up to 430 °C provide a lower estimate of the fluid temperature. |
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