The potential of portable luminescence readers in geomorphological investigations: a review

The development of functional portable optically stimulated luminescence (OSL) readers over the last decade has provided practitioners with the capability to acquire luminescence signals from geological materials relatively rapidly, which allows for expedient preliminary chronostratigraphic insight...

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Veröffentlicht in:Earth surface processes and landforms 2021-01, Vol.46 (1), p.131-150
Hauptverfasser: Munyikwa, Kennedy, Kinnaird, Tim C., Sanderson, David C.W.
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description The development of functional portable optically stimulated luminescence (OSL) readers over the last decade has provided practitioners with the capability to acquire luminescence signals from geological materials relatively rapidly, which allows for expedient preliminary chronostratigraphic insight when working with complex depositional systems of late Quaternary age. Typically, when using the portable OSL reader, infrared (IR) or blue post‐IR OSL signals are acquired from bulk unprocessed materials, in contrast to regular luminescence dating, which is usually based on measurements on pure quartz or feldspar mineral separates, or on select silt‐sized polymineralic portions. To demonstrate the utility of portable OSL measurements, this paper outlines the basic features of portable OSL readers and their constraints. Subsequently, case studies in which the instrument has been used to elucidate cryptostratigraphic variations in sedimentary sequences for geomorphological applications are reviewed. The studies can generally be grouped into three main categories. The first includes studies where the variation of portable OSL reader luminescence signal intensities with depth are plotted to generate profiles that contextualize sediment stratigraphy. In the second group, portable OSL reader luminescence signal intensities are used to interpret sediment processes that shed light on depositional histories. In the last category, luminescence signals from the portable OSL reader are calibrated to approximate numerical burial ages of depositional units. The paper concludes with a discussion of possible future directions. © 2020 John Wiley & Sons, Ltd. The development of functional portable luminescence readers over the last decade provides practitioners with the capability to acquire luminescence signals from geological materials relatively rapidly, which allows for expedient preliminary insight when working with complex depositional systems of late Quaternary age. Basic features of the portable reader are outlined and studies performed using the instrument over the last decade reviewed. Future directions are also explored.
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Typically, when using the portable OSL reader, infrared (IR) or blue post‐IR OSL signals are acquired from bulk unprocessed materials, in contrast to regular luminescence dating, which is usually based on measurements on pure quartz or feldspar mineral separates, or on select silt‐sized polymineralic portions. To demonstrate the utility of portable OSL measurements, this paper outlines the basic features of portable OSL readers and their constraints. Subsequently, case studies in which the instrument has been used to elucidate cryptostratigraphic variations in sedimentary sequences for geomorphological applications are reviewed. The studies can generally be grouped into three main categories. The first includes studies where the variation of portable OSL reader luminescence signal intensities with depth are plotted to generate profiles that contextualize sediment stratigraphy. In the second group, portable OSL reader luminescence signal intensities are used to interpret sediment processes that shed light on depositional histories. In the last category, luminescence signals from the portable OSL reader are calibrated to approximate numerical burial ages of depositional units. The paper concludes with a discussion of possible future directions. © 2020 John Wiley &amp; Sons, Ltd. The development of functional portable luminescence readers over the last decade provides practitioners with the capability to acquire luminescence signals from geological materials relatively rapidly, which allows for expedient preliminary insight when working with complex depositional systems of late Quaternary age. Basic features of the portable reader are outlined and studies performed using the instrument over the last decade reviewed. 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subjects chronology
dating
Feldspars
Geomorphology
landscape evolution
Luminescence
Luminous intensity
optically stimulated luminescence
Portability
portable OSL reader
Quaternary
Sediment
Signal processing
Stratigraphy
title The potential of portable luminescence readers in geomorphological investigations: a review
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