Determining the K-content of single-grains of feldspar for luminescence dating

R. K. Smedley; G. A. T. Duller; N. J. G. Pearce; H. M. Roberts

doi:10.1016/j.radmeas.2012.01.014

Determining the K-content of single-grains of feldspar for luminescence dating

R. K. Smedley^*, G. A. T. Duller, N. J. G. Pearce, H. M. Roberts

^*Corresponding author for this work

Department of Geography and Earth Sciences

Research output: Contribution to journal › Article › peer-review

78 Citations (Scopus)

Abstract

Feldspars form a solid-solution series whereby the K-content may range from 0 to 14%. LA-ICP-MS measurements for density-separated single-grains of feldspar yielded realistic concentrations of K within the range of those naturally occurring, and also highlighted the difficulty in isolating the pure end members during density-separation. No direct relationship was found between the thermal stability of the infrared-stimulated luminescence (IRSL) signal and measured K-content of individual grains. However, the brightest IRSL and post-IR IRSL signals originated from grains with ∼12% K-content. All grains giving a measurable signal had K-content between 6 and 13%, therefore it is suggested that an internal K-content of 10 ± 2% can be assumed for routine single-grain dating of density-separated K-feldspars.

Original language	English
Pages (from-to)	790-796
Number of pages	7
Journal	Radiation Measurements
Volume	47
Issue number	9
Early online date	02 Feb 2012
DOIs	https://doi.org/10.1016/j.radmeas.2012.01.014
Publication status	Published - Sept 2012
Event	Proceedings of the 13th International Conference on Luminescence and Electron Spin - Toruń, Poland Duration: 10 Jul 2011 → 14 Jul 2011

Keywords

POTASSIUM
SEDIMENT EXTRACTS
QUARTZ
LA-ICP-MS
Signal intensity
SPECTRA
SAMPLES
Dose-rate
SIGNALS
Feldspar
DOSE-RATE
Thermal stability
THERMOLUMINESCENCE
PROTOCOL
Luminescence

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title = "Determining the K-content of single-grains of feldspar for luminescence dating",

abstract = "Feldspars form a solid-solution series whereby the K-content may range from 0 to 14%. LA-ICP-MS measurements for density-separated single-grains of feldspar yielded realistic concentrations of K within the range of those naturally occurring, and also highlighted the difficulty in isolating the pure end members during density-separation. No direct relationship was found between the thermal stability of the infrared-stimulated luminescence (IRSL) signal and measured K-content of individual grains. However, the brightest IRSL and post-IR IRSL signals originated from grains with ∼12% K-content. All grains giving a measurable signal had K-content between 6 and 13%, therefore it is suggested that an internal K-content of 10 ± 2% can be assumed for routine single-grain dating of density-separated K-feldspars.",

keywords = "POTASSIUM, SEDIMENT EXTRACTS, QUARTZ, LA-ICP-MS, Signal intensity, SPECTRA, SAMPLES, Dose-rate, SIGNALS, Feldspar, DOSE-RATE, Thermal stability, THERMOLUMINESCENCE, PROTOCOL, Luminescence",

author = "Smedley, {R. K.} and Duller, {G. A. T.} and Pearce, {N. J. G.} and Roberts, {H. M.}",

note = "Smedley, R. K., Duller, G. A. T., Pearce, N. J. G., Roberts, H. M. (2012). Determining the K-content of single-grains of feldspar for luminescence dating. Radiation Measurements, 47 (9), 790-796.; Proceedings of the 13th International Conference on Luminescence and Electron Spin ; Conference date: 10-07-2011 Through 14-07-2011",

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AU - Roberts, H. M.

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N2 - Feldspars form a solid-solution series whereby the K-content may range from 0 to 14%. LA-ICP-MS measurements for density-separated single-grains of feldspar yielded realistic concentrations of K within the range of those naturally occurring, and also highlighted the difficulty in isolating the pure end members during density-separation. No direct relationship was found between the thermal stability of the infrared-stimulated luminescence (IRSL) signal and measured K-content of individual grains. However, the brightest IRSL and post-IR IRSL signals originated from grains with ∼12% K-content. All grains giving a measurable signal had K-content between 6 and 13%, therefore it is suggested that an internal K-content of 10 ± 2% can be assumed for routine single-grain dating of density-separated K-feldspars.

AB - Feldspars form a solid-solution series whereby the K-content may range from 0 to 14%. LA-ICP-MS measurements for density-separated single-grains of feldspar yielded realistic concentrations of K within the range of those naturally occurring, and also highlighted the difficulty in isolating the pure end members during density-separation. No direct relationship was found between the thermal stability of the infrared-stimulated luminescence (IRSL) signal and measured K-content of individual grains. However, the brightest IRSL and post-IR IRSL signals originated from grains with ∼12% K-content. All grains giving a measurable signal had K-content between 6 and 13%, therefore it is suggested that an internal K-content of 10 ± 2% can be assumed for routine single-grain dating of density-separated K-feldspars.

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KW - LA-ICP-MS

KW - Signal intensity

KW - SPECTRA

KW - SAMPLES

KW - Dose-rate

KW - SIGNALS

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KW - DOSE-RATE

KW - Thermal stability

KW - THERMOLUMINESCENCE

KW - PROTOCOL

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M3 - Article

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JO - Radiation Measurements

JF - Radiation Measurements

IS - 9

T2 - Proceedings of the 13th International Conference on Luminescence and Electron Spin

Y2 - 10 July 2011 through 14 July 2011

ER -

Determining the K-content of single-grains of feldspar for luminescence dating

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Keywords

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