Abstract
Three-dimensional thermoluminescence spectra are measured for different types of geological origin quartz from the Altay orogenic belt, northern Xinjiang, China. The results show striking differences which appear to be characteristic of their geological origin. Granitic quartz is dominated by emission bands at 420–430 nm, 550–560 nm, at a temperature of 170 °C. Pegmatite quartz is characterized by an intense 480 nm emission band at 170 °C. Volcanic quartz has exclusive UV (340–360 nm) and violet (410–430 nm) emission bands. Hydrothermal quartz exhibits very different TL spectral characteristics because of different hydrothermal activity and mineralization. Only one TL peaks at 485 nm/170 °C was observed in sedimentary quartz. An intense 730 nm emission band observed at 170 °C considered generally to be characteristics of feldspar was observed in quartz from granite and hydrothermal Au-bearing quartz. This TL peak is probably related to the centre of [FeO 4] 0 on an Si site. All samples show an intense 990–1000 nm emission band at 330 °C. Identical types of quartz formed in different regions or different geological and tectonic settings can also exhibit striking differences in TL spectra.
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