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Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples

Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples
Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples

Muscovite is a mineral commonly found along quartz in sediments, where the latter is the mineral of choice in numerous optically stimulated luminescence (OSL) dating studies. Since muscovite cannot be efficiently eliminated following standard laboratory treatments, it is important to assess its luminescence properties. This study is focused on the investigation of muscovite hand-picked from a quartz sample extracted from loess and of museum specimens of muscovite in order to evaluate their potential implication in the OSL dating of quartz samples contaminated with muscovite grains. The obtained results show that generally applicable luminescence characteristics cannot be described for muscovite. In terms of the thermoluminescence (TL) response, all samples investigated display the same wide peak at 200 °C. The blue light and infrared (IR) sensitivities differ between the samples: 3 out of 5 samples present no or negligible level of OSL and IRSL response, while the other 2 samples are characterised by both blue light (2000–3400 counts in 0.31 s of stimulation for 10 mg of muscovite after irradiation with a dose of 136 Gy) and IR sensitivity (265–320 counts in 0.31 s of stimulation for 10 mg of muscovite after irradiation with a dose of 136 Gy). Based on the samples analysed in this study, aliquots of quartz contaminated with optically (blue light) sensitive muscovite would also be IR sensitive. Hence, potentially problematic aliquots can be identified via the IRSL purity test usually used in the OSL dating of quartz samples for detection of feldspar contamination. The impact of muscovite on dose determination for quartz was also tested and it was concluded that at least in the case of bright quartz, muscovite minerals do not influence the OSL measurements.

Luminescence properties, Muscovite, OSL dating, Quartz
1350-4487
1-7
Antohi-Trandafir, O.
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Timar-Gabor, A.
906cca6f-21da-46f7-baf0-38871d689135
Vulpoi, A.
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Bălc, R.
97d30354-3af5-45b8-87ed-833eed120966
Longman, J.
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Veres, D.
67b7de50-1043-4bfb-a5df-bc87feeefc63
Simon, S.
1fd7e52a-aaa7-4fb3-b105-da8033d98bb4
Antohi-Trandafir, O.
6fa585d9-1af7-4d37-b1bb-94be57594134
Timar-Gabor, A.
906cca6f-21da-46f7-baf0-38871d689135
Vulpoi, A.
7a61a473-3fbe-4f66-9ba4-0137612db9eb
Bălc, R.
97d30354-3af5-45b8-87ed-833eed120966
Longman, J.
26a3c4e3-79d6-4102-9708-a5b02b97121d
Veres, D.
67b7de50-1043-4bfb-a5df-bc87feeefc63
Simon, S.
1fd7e52a-aaa7-4fb3-b105-da8033d98bb4

Antohi-Trandafir, O., Timar-Gabor, A., Vulpoi, A., Bălc, R., Longman, J., Veres, D. and Simon, S. (2018) Luminescence properties of natural muscovite relevant to optical dating of contaminated quartz samples. Radiation Measurements, 109, 1-7. (doi:10.1016/j.radmeas.2017.12.004).

Record type: Article

Abstract

Muscovite is a mineral commonly found along quartz in sediments, where the latter is the mineral of choice in numerous optically stimulated luminescence (OSL) dating studies. Since muscovite cannot be efficiently eliminated following standard laboratory treatments, it is important to assess its luminescence properties. This study is focused on the investigation of muscovite hand-picked from a quartz sample extracted from loess and of museum specimens of muscovite in order to evaluate their potential implication in the OSL dating of quartz samples contaminated with muscovite grains. The obtained results show that generally applicable luminescence characteristics cannot be described for muscovite. In terms of the thermoluminescence (TL) response, all samples investigated display the same wide peak at 200 °C. The blue light and infrared (IR) sensitivities differ between the samples: 3 out of 5 samples present no or negligible level of OSL and IRSL response, while the other 2 samples are characterised by both blue light (2000–3400 counts in 0.31 s of stimulation for 10 mg of muscovite after irradiation with a dose of 136 Gy) and IR sensitivity (265–320 counts in 0.31 s of stimulation for 10 mg of muscovite after irradiation with a dose of 136 Gy). Based on the samples analysed in this study, aliquots of quartz contaminated with optically (blue light) sensitive muscovite would also be IR sensitive. Hence, potentially problematic aliquots can be identified via the IRSL purity test usually used in the OSL dating of quartz samples for detection of feldspar contamination. The impact of muscovite on dose determination for quartz was also tested and it was concluded that at least in the case of bright quartz, muscovite minerals do not influence the OSL measurements.

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Accepted/In Press date: 15 December 2017
e-pub ahead of print date: 16 December 2017
Published date: 1 February 2018
Keywords: Luminescence properties, Muscovite, OSL dating, Quartz

Identifiers

Local EPrints ID: 419707
URI: http://eprints.soton.ac.uk/id/eprint/419707
ISSN: 1350-4487
PURE UUID: c335bb40-1ae2-43bf-ad3b-66ba4a1e02c7

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Date deposited: 19 Apr 2018 16:30
Last modified: 19 Jul 2019 17:22

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Contributors

Author: O. Antohi-Trandafir
Author: A. Timar-Gabor
Author: A. Vulpoi
Author: R. Bălc
Author: J. Longman
Author: D. Veres
Author: S. Simon

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