Cathodoluminescence petrography of syntectonic quartz fibres |
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| Authors: | Dorothee Dietrich Paul R Grant |
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| Institution: | Geologisches Institut, ETH Zentrum, CH-8092 Zürich, Switzerland;Department of Geology, Royal School of Mines, Imperial College, London SW7 2BP, U.K. |
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| Abstract: | The cathodoluminescence of low grade metamorphic quartz is reported in the literature to be uniformly brown. This study describes an investigation of syntectonic quartz fibres from veins and pressure shadows contained in different carbonate units of the Helvetic Alps, Switzerland, and of Anglesey, U.K., with the Scanning Electron Microscope in the cathodoluminescence mode. The cathodoluminescence spectra measured show systematic variations between older and younger parts of the same fibre, and between fibres from different tectonic units. These variations can be related first to variations in the temperature of formation of the quartz fibres, and second to deformation-induced differences in the microstructure of the earlier formed parts of fibres during later imposed strains. |
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