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Journal ArticleDOI

Timing and style of Late Quaternary glaciation in the eastern Hindu Kush, Chitral, northern Pakistan: a review and revision of the glacial chronology based on new optically stimulated luminescence dating

TL;DR: In this paper, optically stimulated luminescence (OSL) dating was used to define the timing of two Late Quaternary major glaciations in the eastern Himalayas and associated sediment deposition.
About: This article is published in Quaternary International.The article was published on 2002-01-01. It has received 113 citations till now. The article focuses on the topics: U-shaped valley & Glacial landform.
Citations
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Journal ArticleDOI
TL;DR: A global overview of glacier advances and retreats (grouped by regions and by millennia) for the Holocene is compiled from previous studies as mentioned in this paper, which reconstructs of glacier fluctuations are based on mapping and dating moraines defined by 14 C, TCN, OSL, lichenometry and tree rings (discontinuous records/time series).

308 citations

Journal ArticleDOI
TL;DR: Luminescence from quartz is commonly used in retrospective dosimetry, in particular for the dating of archaeological materials and sediments from the Quaternary period as discussed by the authors, which is related to the interaction of natural radiation with mineral grains, by the activation of and subsequent trapping of electrons at defects within the quartz lattice.

306 citations

Journal ArticleDOI
TL;DR: In this article, the authors used geomorphic mapping and 10 Be cosmogenic radionuclide (CRN) surface exposure dating in study areas in southeastern (Gonga Shan), southern (Karola Pass) and central (Western Nyainqentanggulha Shan and Tanggula Shan) Tibet, and compared these with recently determined numerical chronologies in other parts of the plateau and its borderlands.

293 citations

Journal ArticleDOI
TL;DR: It has long been known that mountain glaciers and continental ice sheets around the globe reached their respective maximum extent at different times during the last glacial cycle, often well before the global Last Glacial Maximum (LGM; c. 23-19-ka), which is formally defined by peaks in global sea level and marine oxygen isotope records as discussed by the authors.

271 citations

Journal ArticleDOI
01 Nov 2008-Boreas
TL;DR: The application of luminescence methods requires an understanding of the nature of glacial and associated environments to select the most appropriate sediment samples for dating as mentioned in this paper, which requires careful sampling and descriptions of the sampling site, testing for insufficient bleaching and modelling dose rate variability.
Abstract: Dating glacial and associated sediments is essential to provide a temporal framework for accurate reconstructions of past climatic conditions and for helping to determine the nature and magnitude of glaciation for landscape evolution studies. There are few widely applicable, accurate and precise methods available to date Quaternary landforms and sediments, despite the numerous numerical dating methods that are currently available. Furthermore, there are few methods that can be utilized for the whole of the late Quaternary (c. 125 kyr ago to present). Recent developments in luminescence dating, however, are providing opportunities to date a broad range of late Quaternary glacial and associated landform sediments. The application of luminescence methods requires an understanding of the nature of glacial and associated environments to select the most appropriate sediment samples for dating. Problems associated with luminescence dating of glacial sediments include insufficient bleaching, low sensitivity of quartz, and variable dose rates during the history of the sediment due to changing water content or nuclide leaching. These problems can be overcome by careful sampling and descriptions of the sampling site, testing for insufficient bleaching and modelling dose rate variability.

232 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the authors examined the interpretation of the sensitivity corrected growth curve as a function of dose, and the effect of changing measurement conditions (e.g., preheat temperature, size of test dose, stimulation temperature) on the estimation of De.

4,287 citations


"Timing and style of Late Quaternary..." refers methods in this paper

  • ...…the advantages of robust sensitivity correction, recuperation assessment, rapidity of measurement and increased precision via interpolation, made the use of the latest single aliquot regenerative-dose (SAR) protocols developed by Murray and Wintle (2000) an additional attractive prospect....

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  • ...De measurements were determined using the SAR protocol developed by Murray and Wintle (2000)....

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  • ...Mean equivalent dose (De) determined from replicated single-aliquot regenerative-dose (SAR; Murray and Wintle, 2000) runs....

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Journal ArticleDOI
TL;DR: In this paper, the contribution of cosmic rays to the dose rates for TL/ESR dating depends on altitude, latitude and depth below ground level, and the effects are shown to be small over the past 500 ka in most circumstances.

3,042 citations


"Timing and style of Late Quaternary..." refers methods in this paper

  • ...These were summed together with a cosmic ray component (estimated using Prescott and Hutton, 1994) to give estimates of the total dose-rate for each sample....

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01 Jan 2011
TL;DR: In the field of luminescence and electron spin resonance dating, dose rate conversion factors are widely used to convert concentrations of radioactive isotopes to dose rate values as mentioned in this paper, which are derived from data provided by the National Nuclear Data Center of the Brookhaven National Laboratory, which are compiled in Evaluated Nuclear Structure Data Files (ENSDF) and Nuclear Wallet Cards.
Abstract: In the field of luminescence and electron spin resonance dating, dose rate conversion factors are widely used to convert concentrations of radioactive isotopes to dose rate values. These factors are derived from data provided by the National Nuclear Data Center of the Brookhaven National Laboratory, which are compiled in Evaluated Nuclear Structure Data Files (ENSDF) and Nuclear Wallet Cards. The recalculated dose rate conversion factors are a few percent higher than those previously published, except for beta and gamma emissions of the isotopes of the U-series decay chains.

2,036 citations

Journal ArticleDOI

1,439 citations


"Timing and style of Late Quaternary..." refers background or methods in this paper

  • ...Using appropriate dose-rate conversion factors (Adamiec and Aitken, 1998) and beta attenuation factors (see Table 1, note d) the elemental concentrations were converted into external beta and gamma components, which were in turn attenuated for moisture content....

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  • ...Due to evidence of poorer solar bleaching efficiency of remnant luminescence from feldspars (summarized by Aitken, 1998) and the potential problems with respect to fading and accurate assessment of microdosimetry, we decided to focus the main optical dating of these sediments on the green…...

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  • ...Estimated fractional water content from whole sediment (Aitken, 1998)....

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  • ...Estimated fractional water content from whole sediment (Aitken, 1998). Uncertainty taken as 75%. Estimated contribution to dose-rate from cosmic rays calculated according to Prescott and Hutton (1994). Uncertainty taken as 710%....

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  • ...Due to evidence of poorer solar bleaching efficiency of remnant luminescence from feldspars (summarized by Aitken, 1998) and the potential problems with respect to fading and accurate assessment of microdosimetry, we decided to focus the main optical dating of these sediments on the green stimulated luminescence (GSL) or blue–green stimulated luminescence (BGSL) from quartz fractions. Furthermore, the advantages of robust sensitivity correction, recuperation assessment, rapidity of measurement and increased precision via interpolation, made the use of the latest single aliquot regenerative-dose (SAR) protocols developed by Murray and Wintle (2000) an additional attractive prospect....

    [...]

Journal ArticleDOI
TL;DR: In this article, correction factors for attenuation of beta radiation by spherical quartz grains embedded in ceramics were obtained for grain diameters ranging from 0.005 to 10.0 mm.
Abstract: Correction factors for attenuation of beta radiation by spherical quartz grains embedded in ceramics were obtained for grain diameters ranging from 0.005 to 10.0 mm. The calculation was based on the absorbed-dose distributions for point-isotopic beta sources listed by Berger, in conjunction with the scaling procedure developed by Cross, and included beta particles, internal conversion electrons, and Auger electrons emitted by /sup 40/K, and the /sup 232/Th and /sup 238/U series.

861 citations